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2022-10-10Merge tag 'bitmap-6.1-rc1' of https://github.com/norov/linuxLinus Torvalds1-1/+1
Pull bitmap updates from Yury Norov: - Fix unsigned comparison to -1 in CPUMAP_FILE_MAX_BYTES (Phil Auld) - cleanup nr_cpu_ids vs nr_cpumask_bits mess (me) This series cleans that mess and adds new config FORCE_NR_CPUS that allows to optimize cpumask subsystem if the number of CPUs is known at compile-time. - optimize find_bit() functions (me) Reworks find_bit() functions based on new FIND_{FIRST,NEXT}_BIT() macros. - add find_nth_bit() (me) Adds find_nth_bit(), which is ~70 times faster than bitcounting with for_each() loop: for_each_set_bit(bit, mask, size) if (n-- == 0) return bit; Also adds bitmap_weight_and() to let people replace this pattern: tmp = bitmap_alloc(nbits); bitmap_and(tmp, map1, map2, nbits); weight = bitmap_weight(tmp, nbits); bitmap_free(tmp); with a single bitmap_weight_and() call. - repair cpumask_check() (me) After switching cpumask to use nr_cpu_ids, cpumask_check() started generating many false-positive warnings. This series fixes it. - Add for_each_cpu_andnot() and for_each_cpu_andnot() (Valentin Schneider) Extends the API with one more function and applies it in sched/core. * tag 'bitmap-6.1-rc1' of https://github.com/norov/linux: (28 commits) sched/core: Merge cpumask_andnot()+for_each_cpu() into for_each_cpu_andnot() lib/test_cpumask: Add for_each_cpu_and(not) tests cpumask: Introduce for_each_cpu_andnot() lib/find_bit: Introduce find_next_andnot_bit() cpumask: fix checking valid cpu range lib/bitmap: add tests for for_each() loops lib/find: optimize for_each() macros lib/bitmap: introduce for_each_set_bit_wrap() macro lib/find_bit: add find_next{,_and}_bit_wrap cpumask: switch for_each_cpu{,_not} to use for_each_bit() net: fix cpu_max_bits_warn() usage in netif_attrmask_next{,_and} cpumask: add cpumask_nth_{,and,andnot} lib/bitmap: remove bitmap_ord_to_pos lib/bitmap: add tests for find_nth_bit() lib: add find_nth{,_and,_andnot}_bit() lib/bitmap: add bitmap_weight_and() lib/bitmap: don't call __bitmap_weight() in kernel code tools: sync find_bit() implementation lib/find_bit: optimize find_next_bit() functions lib/find_bit: create find_first_zero_bit_le() ...
2022-10-01mips: allow firmware to pass RNG seed to kernelJason A. Donenfeld1-0/+21
Nearly all other firmware environments have some way of passing a RNG seed to initialize the RNG: DTB's rng-seed, EFI's RNG protocol, m68k's bootinfo block, x86's setup_data, and so forth. This adds something similar for MIPS, which will allow various firmware environments, bootloaders, and hypervisors to pass an RNG seed to initialize the kernel's RNG. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2022-09-19smp: add set_nr_cpu_ids()Yury Norov1-1/+1
In preparation to support compile-time nr_cpu_ids, add a setter for the variable. This is a no-op for all arches. Signed-off-by: Yury Norov <yury.norov@gmail.com>
2022-05-24MIPS: Use memblock_add_node() in early_parse_mem() under CONFIG_NUMATiezhu Yang1-1/+5
Use memblock_add_node to add new memblock region within a NUMA node in early_parse_mem() under CONFIG_NUMA, otherwise the mem parameter can not work well. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2022-05-24MIPS: Return -EINVAL if mem parameter is empty in early_parse_mem()Tiezhu Yang1-0/+5
In the current code, the users usually need to make sure the value of mem parameter is correct, but it is better to do some check to avoid potential boot hangs. This commit checks whether mem parameter is empty, if yes, return -EINVAL before call memblock_remove() and memblock_add(). Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2022-05-23mips: setup: use strscpy to replace strlcpy陈学兵1-3/+3
The strlcpy should not be used because it doesn't limit the source length. Preferred is strscpy. Signed-off-by: XueBing Chen <chenxuebing@jari.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2022-02-22mips: setup: fix setnocoherentio() boolean settingRandy Dunlap1-1/+1
Correct a typo/pasto: setnocoherentio() should set dma_default_coherent to false, not true. Fixes: 14ac09a65e19 ("MIPS: refactor the runtime coherent vs noncoherent DMA indicators") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: linux-mips@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-09-03memblock: make memblock_find_in_range method privateMike Rapoport1-8/+6
There are a lot of uses of memblock_find_in_range() along with memblock_reserve() from the times memblock allocation APIs did not exist. memblock_find_in_range() is the very core of memblock allocations, so any future changes to its internal behaviour would mandate updates of all the users outside memblock. Replace the calls to memblock_find_in_range() with an equivalent calls to memblock_phys_alloc() and memblock_phys_alloc_range() and make memblock_find_in_range() private method of memblock. This simplifies the callers, ensures that (unlikely) errors in memblock_reserve() are handled and improves maintainability of memblock_find_in_range(). Link: https://lkml.kernel.org/r/20210816122622.30279-1-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Acked-by: Kirill A. Shutemov <kirill.shtuemov@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ACPI] Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Acked-by: Nick Kossifidis <mick@ics.forth.gr> [riscv] Tested-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-03-30MIPS: kernel: setup.c: fix compilation errorMauri Sandberg1-1/+1
With ath79_defconfig enabling CONFIG_MIPS_ELF_APPENDED_DTB gives a compilation error. This patch fixes it. Build log: ... CC kernel/locking/percpu-rwsem.o ../arch/mips/kernel/setup.c:46:39: error: conflicting types for '__appended_dtb' const char __section(".appended_dtb") __appended_dtb[0x100000]; ^~~~~~~~~~~~~~ In file included from ../arch/mips/kernel/setup.c:34: ../arch/mips/include/asm/bootinfo.h:118:13: note: previous declaration of '__appended_dtb' was here extern char __appended_dtb[]; ^~~~~~~~~~~~~~ CC fs/attr.o make[4]: *** [../scripts/Makefile.build:271: arch/mips/kernel/setup.o] Error 1 ... Root cause seems to be: Fixes: b83ba0b9df56 ("MIPS: of: Introduce helper function to get DTB") Signed-off-by: Mauri Sandberg <sandberg@mailfence.com> Reviewed-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: trivial@kernel.org Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-13MIPS: Use common way to parse elfcorehdrJinyang He1-28/+21
"elfcorehdr" can be parsed at kernel/crash_dump.c Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-13MIPS: remove CONFIG_DMA_MAYBE_COHERENTChristoph Hellwig1-1/+1
CONFIG_DMA_MAYBE_COHERENT just guards two early init options now. Just enable them unconditionally for CONFIG_DMA_NONCOHERENT. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-13driver core: lift dma_default_coherent into common codeChristoph Hellwig1-4/+0
Lift the dma_default_coherent variable from the mips architecture code to the driver core. This allows an architecture to sdefault all device to be DMA coherent at run time, even if the kernel is build with support for DMA noncoherent device. By allowing device_initialize to set the ->dma_coherent field to this default the amount of arch hooks required for this behavior can be greatly reduced. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-13MIPS: refactor the runtime coherent vs noncoherent DMA indicatorsChristoph Hellwig1-6/+4
Replace the global coherentio enum, and the hw_coherentio (fake) boolean variables with a single boolean dma_default_coherent flag. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-09Revert "mips: Manually call fdt_init_reserved_mem() method"Serge Semin1-3/+0
This reverts commit 3751cbda8f223549d7ea28803cbec8ac87e43ed2. Originally the patch was created to fix the reserved-memory DT-node parsing failure on the early stages of the platform memory initialization. That happened due to the two early memory allocators utilization that time: bootmem and memblock. At first the platform-specific memory mapping array was initialized. Then the early_init_fdt_scan_reserved_mem() was called, which couldn't fully parse the "reserved-memory" DT-node since neither memblock nor bootmem allocators hadn't been initialized at that stage, so the fdt_init_reserved_mem() method failed on the memory allocation calls. Only after that the platform-specific memory mapping were used to create proper bootmem and memblock structures and let the early memory allocations work. That's why we had to call the fdt_init_reserved_mem() method one more time to retry the initialization of the features like CMA. The necessity to have that fix was disappeared after the full memblock support had been added to the MIPS kernel and all plat_mem_setup() had been fixed to add the memory regions right into the memblock memory pool. Let's revert that patch then especially after having Paul reported that the second fdt_init_reserved_mem() call causes the reserved memory pool being created twice bigger than implied. Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Reported-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-09MIPS: relocatable: Provide kaslr_offset() to get the kernel offsetJinyang He1-0/+3
Provide kaslr_offset() to get the kernel offset when KASLR is enabled. Error may occur before update_kaslr_offset(), so put it at the end of the offset branch. Fixes: a307a4ce9ecd ("MIPS: Loongson64: Add KASLR support") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-02-04MIPS: of: Introduce helper function to get DTBThomas Bogendoerfer1-4/+0
Selection of the DTB to be used was burried in more or less readable code in head.S. Move this code into a inline helper function and use it. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Florian Fainelli <f.fainelli@gmail.com>
2020-12-04MIPS: Move memblock_dump_all() to the end of setup_arch()Tiezhu Yang1-2/+2
In order to get more memblock configuration with memblock=debug in the boot cmdline, move memblock_dump_all() to the end of setup_arch(), this can help us to get dmi_setup() and resource_init() memblock info, at least for now. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-12-04MIPS: Don't round up kernel sections size for memblock_add()Alexander Sverdlin1-2/+2
Linux doesn't own the memory immediately after the kernel image. On Octeon bootloader places a shared structure right close after the kernel _end, refer to "struct cvmx_bootinfo *octeon_bootinfo" in cavium-octeon/setup.c. If check_kernel_sections_mem() rounds the PFNs up, first memblock_alloc() inside early_init_dt_alloc_memory_arch() <= device_tree_init() returns memory block overlapping with the above octeon_bootinfo structure, which is being overwritten afterwards. Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-11-17MIPS: kernel: Fix for_each_memblock conversionThomas Bogendoerfer1-3/+3
The loop over all memblocks works with PFNs and not physical addresses, so we need for_each_mem_pfn_range(). Fixes: b10d6bca8720 ("arch, drivers: replace for_each_membock() with for_each_mem_range()") Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
2020-10-25treewide: Convert macro and uses of __section(foo) to __section("foo")Joe Perches1-1/+1
Use a more generic form for __section that requires quotes to avoid complications with clang and gcc differences. Remove the quote operator # from compiler_attributes.h __section macro. Convert all unquoted __section(foo) uses to quoted __section("foo"). Also convert __attribute__((section("foo"))) uses to __section("foo") even if the __attribute__ has multiple list entry forms. Conversion done using the script at: https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Nick Desaulniers <ndesaulniers@gooogle.com> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-16Merge tag 'mips_5.10' of ↵Linus Torvalds1-48/+28
git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux Pull MIPS updates from Thomas Bogendoerfer: - removed support for PNX833x alias NXT_STB22x - included Ingenic SoC support into generic MIPS kernels - added support for new Ingenic SoCs - converted workaround selection to use Kconfig - replaced old boot mem functions by memblock_* - enabled COP2 usage in kernel for Loongson64 to make use of 16byte load/stores possible - cleanups and fixes * tag 'mips_5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (92 commits) MIPS: DEC: Restore bootmem reservation for firmware working memory area MIPS: dec: fix section mismatch bcm963xx_tag.h: fix duplicated word mips: ralink: enable zboot support MIPS: ingenic: Remove CPU_SUPPORTS_HUGEPAGES MIPS: cpu-probe: remove MIPS_CPU_BP_GHIST option bit MIPS: cpu-probe: introduce exclusive R3k CPU probe MIPS: cpu-probe: move fpu probing/handling into its own file MIPS: replace add_memory_region with memblock MIPS: Loongson64: Clean up numa.c MIPS: Loongson64: Select SMP in Kconfig to avoid build error mips: octeon: Add Ubiquiti E200 and E220 boards MIPS: SGI-IP28: disable use of ll/sc in kernel MIPS: tx49xx: move tx4939_add_memory_regions into only user MIPS: pgtable: Remove used PAGE_USERIO define MIPS: alchemy: Share prom_init implementation MIPS: alchemy: Fix build breakage, if TOUCHSCREEN_WM97XX is disabled MIPS: process: include exec.h header in process.c MIPS: process: Add prototype for function arch_dup_task_struct MIPS: idle: Add prototype for function check_wait ...
2020-10-15Merge tag 'dma-mapping-5.10' of git://git.infradead.org/users/hch/dma-mappingLinus Torvalds1-1/+1
Pull dma-mapping updates from Christoph Hellwig: - rework the non-coherent DMA allocator - move private definitions out of <linux/dma-mapping.h> - lower CMA_ALIGNMENT (Paul Cercueil) - remove the omap1 dma address translation in favor of the common code - make dma-direct aware of multiple dma offset ranges (Jim Quinlan) - support per-node DMA CMA areas (Barry Song) - increase the default seg boundary limit (Nicolin Chen) - misc fixes (Robin Murphy, Thomas Tai, Xu Wang) - various cleanups * tag 'dma-mapping-5.10' of git://git.infradead.org/users/hch/dma-mapping: (63 commits) ARM/ixp4xx: add a missing include of dma-map-ops.h dma-direct: simplify the DMA_ATTR_NO_KERNEL_MAPPING handling dma-direct: factor out a dma_direct_alloc_from_pool helper dma-direct check for highmem pages in dma_direct_alloc_pages dma-mapping: merge <linux/dma-noncoherent.h> into <linux/dma-map-ops.h> dma-mapping: move large parts of <linux/dma-direct.h> to kernel/dma dma-mapping: move dma-debug.h to kernel/dma/ dma-mapping: remove <asm/dma-contiguous.h> dma-mapping: merge <linux/dma-contiguous.h> into <linux/dma-map-ops.h> dma-contiguous: remove dma_contiguous_set_default dma-contiguous: remove dev_set_cma_area dma-contiguous: remove dma_declare_contiguous dma-mapping: split <linux/dma-mapping.h> cma: decrease CMA_ALIGNMENT lower limit to 2 firewire-ohci: use dma_alloc_pages dma-iommu: implement ->alloc_noncoherent dma-mapping: add new {alloc,free}_noncoherent dma_map_ops methods dma-mapping: add a new dma_alloc_pages API dma-mapping: remove dma_cache_sync 53c700: convert to dma_alloc_noncoherent ...
2020-10-13arch, drivers: replace for_each_membock() with for_each_mem_range()Mike Rapoport1-16/+15
There are several occurrences of the following pattern: for_each_memblock(memory, reg) { start = __pfn_to_phys(memblock_region_memory_base_pfn(reg); end = __pfn_to_phys(memblock_region_memory_end_pfn(reg)); /* do something with start and end */ } Using for_each_mem_range() iterator is more appropriate in such cases and allows simpler and cleaner code. [akpm@linux-foundation.org: fix arch/arm/mm/pmsa-v7.c build] [rppt@linux.ibm.com: mips: fix cavium-octeon build caused by memblock refactoring] Link: http://lkml.kernel.org/r/20200827124549.GD167163@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Baoquan He <bhe@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Daniel Axtens <dja@axtens.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Emil Renner Berthing <kernel@esmil.dk> Cc: Hari Bathini <hbathini@linux.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20200818151634.14343-13-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-12MIPS: replace add_memory_region with memblockThomas Bogendoerfer1-44/+6
add_memory_region was the old interface for registering memory and was already changed to used memblock internaly. Replace it by directly calling memblock functions. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-10-06dma-mapping: merge <linux/dma-contiguous.h> into <linux/dma-map-ops.h>Christoph Hellwig1-1/+1
Merge dma-contiguous.h into dma-map-ops.h, after removing the comment describing the contiguous allocator into kernel/dma/contigous.c. Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-09-21MIPS: kexec: Add crashkernel=YM handlingYouling Tang1-3/+21
When the kernel crashkernel parameter is specified with just a size, we are supposed to allocate a region from RAM to store the crashkernel. However, MIPS merely reserves physical address zero with no checking that there is even RAM there. Fix this by lifting similar code from x86, importing it to MIPS with the MIPS specific parameters added. In the absence of any platform specific information, we allocate the crashkernel region from the first 512MB of physical memory (limited to CKSEG0 or KSEG0 address range). When X is not specified, crash_base defaults to 0 (crashkernel=YM@XM). E.g. without this patch: The environment as follows: [ 0.000000] MIPS: machine is loongson,loongson64c-4core-ls7a ... [ 0.000000] Kernel command line: root=/dev/sda2 crashkernel=96M ... The warning as follows: [ 0.000000] Invalid memory region reserved for crash kernel And the iomem as follows: 00200000-0effffff : System RAM 00200000-00b47f87 : Kernel code 00b47f88-00dfffff : Kernel data 00e60000-01f73c7f : Kernel bss 1a000000-1bffffff : pci@1a000000 ... With this patch: After increasing crash_base <= 0 handling. And the iomem as follows: 00200000-0effffff : System RAM 00200000-00b47f87 : Kernel code 00b47f88-00dfffff : Kernel data 00e60000-01f73c7f : Kernel bss 04000000-09ffffff : Crash kernel 1a000000-1bffffff : pci@1a000000 ... Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-09-21MIPS: Make setup_elfcorehdr and setup_elfcorehdr_size staticJason Yan1-1/+1
This addresses the following sparse warning: arch/mips/kernel/setup.c:446:33: warning: symbol 'setup_elfcorehdr_size' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-08-07mm/sparse: cleanup the code surrounding memory_present()Mike Rapoport1-8/+0
After removal of CONFIG_HAVE_MEMBLOCK_NODE_MAP we have two equivalent functions that call memory_present() for each region in memblock.memory: sparse_memory_present_with_active_regions() and membocks_present(). Moreover, all architectures have a call to either of these functions preceding the call to sparse_init() and in the most cases they are called one after the other. Mark the regions from memblock.memory as present during sparce_init() by making sparse_init() call memblocks_present(), make memblocks_present() and memory_present() functions static and remove redundant sparse_memory_present_with_active_regions() function. Also remove no longer required HAVE_MEMORY_PRESENT configuration option. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200712083130.22919-1-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-07-26MIPS: Fix unable to reserve memory for Crash kernelJinyang He1-1/+1
Use 0 as the align parameter in memblock_find_in_range() is incorrect when we reserve memory for Crash kernel. The environment as follows: [ 0.000000] MIPS: machine is loongson,loongson64c-4core-rs780e ... [ 1.951016] crashkernel=64M@128M The warning as follows: [ 0.000000] Invalid memory region reserved for crash kernel And the iomem as follows: 00200000-0effffff : System RAM 04000000-0484009f : Kernel code 048400a0-04ad7fff : Kernel data 04b40000-05c4c6bf : Kernel bss 1a000000-1bffffff : pci@1a000000 ... The align parameter may be finally used by round_down() or round_up(). Like the following call tree: mips-next: mm/memblock.c memblock_find_in_range └── memblock_find_in_range_node ├── __memblock_find_range_bottom_up │ └── round_up └── __memblock_find_range_top_down └── round_down \#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) \#define round_down(x, y) ((x) & ~__round_mask(x, y)) \#define __round_mask(x, y) ((__typeof__(x))((y)-1)) The round_down(or round_up)'s second parameter must be a power of 2. If the second parameter is 0, it both will return 0. Use 1 as the parameter to fix the bug and the iomem as follows: 00200000-0effffff : System RAM 04000000-0484009f : Kernel code 048400a0-04ad7fff : Kernel data 04b40000-05c4c6bf : Kernel bss 08000000-0bffffff : Crash kernel 1a000000-1bffffff : pci@1a000000 ... Signed-off-by: Jinyang He <hejinyang@loongson.cn> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-05-19MIPS: Remove useless parameter of bootcmdline_init()Zhi Li1-2/+2
The parameter "cmdline_p" is useless in bootcmdline_init()，remove it. Signed-off-by: Zhi Li <lizhi01@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-04-21MIPS: Make sparse_init() using top-down allocationTiezhu Yang1-0/+10
In the current code, if CONFIG_SWIOTLB is set, when failed to get IO TLB memory from the low pages by plat_swiotlb_setup(), it may lead to the boot process failed with kernel panic. (1) On the Loongson and SiByte platform arch/mips/loongson64/dma.c arch/mips/sibyte/common/dma.c void __init plat_swiotlb_setup(void) { swiotlb_init(1); } kernel/dma/swiotlb.c void __init swiotlb_init(int verbose) { ... vstart = memblock_alloc_low(PAGE_ALIGN(bytes), PAGE_SIZE); if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose)) return; ... pr_warn("Cannot allocate buffer"); no_iotlb_memory = true; } phys_addr_t swiotlb_tbl_map_single() { ... if (no_iotlb_memory) panic("Can not allocate SWIOTLB buffer earlier ..."); ... } (2) On the Cavium OCTEON platform arch/mips/cavium-octeon/dma-octeon.c void __init plat_swiotlb_setup(void) { ... octeon_swiotlb = memblock_alloc_low(swiotlbsize, PAGE_SIZE); if (!octeon_swiotlb) panic("%s: Failed to allocate %zu bytes align=%lx\n", __func__, swiotlbsize, PAGE_SIZE); ... } Because IO_TLB_DEFAULT_SIZE is 64M, if the rest size of low memory is less than 64M when call plat_swiotlb_setup(), we can easily reproduce the panic case. In order to reduce the possibility of kernel panic when failed to get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate low memory as small as possible before plat_swiotlb_setup(), so make sparse_init() using top-down allocation. Reported-by: Juxin Gao <gaojuxin@loongson.cn> Co-developed-by: Juxin Gao <gaojuxin@loongson.cn> Signed-off-by: Juxin Gao <gaojuxin@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-04-21MIPS: Cleanup code about plat_mem_setup()Tiezhu Yang1-2/+0
In the current code, plat_mem_setup() is called by arch_mem_init() instead of setup_arch() and has been declared in asm/bootinfo.h, so modify the code comment to reflect the reality and remove the useless duplicate declartion in arch/mips/kernel/setup.c. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-04-21MIPS: Do not initialise globals to 0Tiezhu Yang1-1/+1
Fix the following checkpatch error: ERROR: do not initialise globals to 0 #834: FILE: arch/mips/kernel/setup.c:834: +int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-03-23MIPS: Add support for Desktop Management Interface (DMI)Tiezhu Yang1-0/+2
Enable DMI scanning on the MIPS architecture, this setups DMI identifiers (dmi_system_id) for printing it out on task dumps and prepares DIMM entry information (dmi_memdev_info) from the SMBIOS table. With this patch, the driver can easily match various of mainboards. In the SMBIOS reference specification, the table anchor string "_SM_" is present in the address range 0xF0000 to 0xFFFFF on a 16-byte boundary, but there exists a special case for Loongson platform, when call function dmi_early_remap, it should specify the start address to 0xFFFE000 due to it is reserved for SMBIOS and can be normally access in the BIOS. This patch works fine on the Loongson 3A3000 platform which belongs to MIPS architecture and has no influence on the other architectures such as x86 and ARM. Additionally, in order to avoid the unknown risks on the mips platform which is not MACH_LOONGSON64, the DMI config is better to depend on MACH_LOONGSON64. If other mips platform also needs this DMI feature in the future, the "depends on" condition can be modified. Co-developed-by: Yinglu Yang <yangyinglu@loongson.cn> Signed-off-by: Yinglu Yang <yangyinglu@loongson.cn> [jiaxun.yang@flygoat.com: Refine definitions and Kconfig] Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Reviewed-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-02-27MIPS: Fix CONFIG_MIPS_CMDLINE_DTB_EXTEND handlingPaul Cercueil1-1/+2
The CONFIG_MIPS_CMDLINE_DTB_EXTEND option is used so that the kernel arguments provided in the 'bootargs' property in devicetree are extended with the kernel arguments provided by the bootloader. The code was broken, as it didn't actually take any of the kernel arguments provided in devicetree when that option was set. Fixes: 7784cac69735 ("MIPS: cmdline: Clean up boot_command_line initialization") Cc: stable@vger.kernel.org Signed-off-by: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-01-31Merge tag 'mips_5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linuxLinus Torvalds1-4/+2
Pull MIPS changes from Paul Burton: "Nothing too big or scary in here: - Support mremap() for the VDSO, primarily to allow CRIU to restore the VDSO to its checkpointed location. - Restore the MIPS32 cBPF JIT, after having reverted the enablement of the eBPF JIT for MIPS32 systems in the 5.5 cycle. - Improve cop0 counter synchronization behaviour whilst onlining CPUs by running with interrupts disabled. - Better match FPU behaviour when emulating multiply-accumulate instructions on pre-r6 systems that implement IEEE754-2008 style MACs. - Loongson64 kernels now build using the MIPS64r2 ISA, allowing them to take advantage of instructions introduced by r2. - Support for the Ingenic X1000 SoC & the really nice little CU Neo development board that's using it. - Support for WMAC on GARDENA Smart Gateway devices. - Lots of cleanup & refactoring of SGI IP27 (Origin 2*) support in preparation for introducing IP35 (Origin 3*) support. - Various Kconfig & Makefile cleanups" * tag 'mips_5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (60 commits) MIPS: PCI: Add detection of IOC3 on IO7, IO8, IO9 and Fuel MIPS: Loongson64: Disable exec hazard MIPS: Loongson64: Bump ISA level to MIPSR2 MIPS: Make DIEI support as a config option MIPS: OCTEON: octeon-irq: fix spelling mistake "to" -> "too" MIPS: asm: local: add barriers for Loongson MIPS: Loongson64: Select mac2008 only feature MIPS: Add MAC2008 Support Revert "MIPS: Add custom serial.h with BASE_BAUD override for generic kernel" MIPS: sort MIPS and MIPS_GENERIC Kconfig selects alphabetically (again) MIPS: make CPU_HAS_LOAD_STORE_LR opt-out MIPS: generic: don't unconditionally select PINCTRL MIPS: don't explicitly select LIBFDT in Kconfig MIPS: sync-r4k: do slave counter synchronization with disabled HW interrupts MIPS: SGI-IP30: Check for valid pointer before using it MIPS: syscalls: fix indentation of the 'SYSNR' message MIPS: boot: fix typo in 'vmlinux.lzma.its' target MIPS: fix indentation of the 'RELOCS' message dt-bindings: Document loongson vendor-prefix MIPS: CU1000-Neo: Refresh defconfig to support HWMON and WiFi. ...
2020-01-14arch/mips/setup: Drop dummy_con initializationArvind Sankar1-2/+0
con_init in tty/vt.c will now set conswitchp to dummy_con if it's unset. Drop it from arch setup code. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20191218214506.49252-13-nivedita@alum.mit.edu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-10MIPS: use resource_sizeJulia Lawall1-4/+2
Use resource_size rather than a verbose computation on the end and start fields. The semantic patch that makes these changes is as follows: (http://coccinelle.lip6.fr/) <smpl> @@ struct resource ptr; @@ - (ptr.end - ptr.start + 1) + resource_size(&ptr) </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: kernel-janitors@vger.kernel.org Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
2019-10-31MIPS: Loongson64: Rename CPU TYPESJiaxun Yang1-1/+1
CPU_LOONGSON2 -> CPU_LOONGSON2EF CPU_LOONGSON3 -> CPU_LOONGSON64 As newer loongson-2 products (2G/2H/2K1000) can share kernel implementation with loongson-3 while 2E/2F are less similar with other LOONGSON64 products. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: linux-mips@vger.kernel.org Cc: chenhc@lemote.com Cc: paul.burton@mips.com
2019-10-12MIPS: Make builtin_cmdline const & variable lengthPaul Burton1-1/+1
We have no need for the builtin_cmdline array to be fixed at the length of COMMAND_LINE_SIZE - we'll only copy out the string it contains up to its NULL terminator anyway, and cap the size at COMMAND_LINE_SIZE when copying into or concatenating with boot_command_line. The string value is also constant, so we can declare it as such to place it in the .init.rodata section. Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-mips@vger.kernel.org
2019-10-12MIPS: Fix CONFIG_OF_EARLY_FLATTREE=n buildsPaul Burton1-0/+6
Configurations with CONFIG_OF_EARLY_FLATTREE=n fail to build since commit 7784cac69735 ("MIPS: cmdline: Clean up boot_command_line initialization") because of_scan_flat_dt() & of_scan_flat_dt() are not defined in these configurations. Fix this by #ifdef'ing the affected code... Signed-off-by: Paul Burton <paul.burton@mips.com> Fixes: 7784cac69735 ("MIPS: cmdline: Clean up boot_command_line initialization") Reported-by: kbuild test robot <lkp@intel.com> Cc: linux-mips@vger.kernel.org
2019-10-12MIPS: Always define builtin_cmdlinePaul Burton1-0/+2
Commit 7784cac69735 ("MIPS: cmdline: Clean up boot_command_line initialization") made use of builtin_cmdline conditional upon plain C if statements rather than preprocessor #ifdef's. This caused build failures for configurations with CONFIG_CMDLINE_BOOL=n where builtin_cmdline wasn't defined, for example: arch/mips/kernel/setup.c: In function 'bootcmdline_init': >> arch/mips/kernel/setup.c:582:30: error: 'builtin_cmdline' undeclared (first use in this function); did you mean 'builtin_driver'? strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); ^~~~~~~~~~~~~~~ builtin_driver arch/mips/kernel/setup.c:582:30: note: each undeclared identifier is reported only once for each function it appears in Fix this by defining builtin_cmdline as an empty string in the affected configurations. All of the paths that use it should be optimized out anyway so the data itself gets optimized away too. Signed-off-by: Paul Burton <paul.burton@mips.com> Fixes: 7784cac69735 ("MIPS: cmdline: Clean up boot_command_line initialization") Reported-by: kbuild test robot <lkp@intel.com> Reported-by: Nathan Chancellor <natechancellor@gmail.com> Cc: linux-mips@vger.kernel.org
2019-10-10MIPS: cmdline: Clean up boot_command_line initializationPaul Burton1-42/+83
Our current code to initialize boot_command_line is a mess. Some of this is due to the addition of too many options over the years, and some of this is due to workarounds for early_init_dt_scan_chosen() performing actions specific to options from other architectures that probably shouldn't be in generic code. Clean this up by introducing a new bootcmdline_init() function that simplifies the initialization somewhat. The major changes are: - Because bootcmdline_init() is a function it can return early in the CONFIG_CMDLINE_OVERRIDE case. - We clear boot_command_line rather than inheriting whatever early_init_dt_scan_chosen() may have left us. This means we no longer need to set boot_command_line to a space character in an attempt to prevent early_init_dt_scan_chosen() from copying CONFIG_CMDLINE into boot_command_line without us knowing about it. - Indirection via USE_PROM_CMDLINE, USE_DTB_CMDLINE, EXTEND_WITH_PROM & BUILTIN_EXTEND_WITH_PROM macros is removed; they seemingly served only to obfuscate the code. - The logic is cleaner, clearer & commented. Two minor drawbacks of this approach are: 1) We call of_scan_flat_dt(), which means we scan through the DT again. The overhead is fairly minimal & shouldn't be noticeable. 2) cmdline_scan_chosen() duplicates a small amount of the logic from early_init_dt_scan_chosen(). Alternatives might be to allow the generic FDT code to keep & expose a copy of the arguments taken from the /chosen node's bootargs property, or to introduce a function like early_init_dt_scan_chosen() that retrieves them without modification to handle CONFIG_CMDLINE. Neither of these sounds particularly cleaner though, and this way we at least keep the extra work in arch/mips. Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-mips@vger.kernel.org
2019-10-02MIPS: init: Prevent adding memory before PHYS_OFFSETThomas Bogendoerfer1-0/+3
On some SGI machines (IP28 and IP30) a small region of memory is mirrored to pyhsical address 0 for exception vectors while rest of the memory is reachable at a higher physical address. ARC PROM marks this region as reserved, but with commit a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") this chunk is used, when searching for start of ram, which breaks at least IP28 and IP30 machines. To fix this add_region_memory() checks for start address < PHYS_OFFSET and ignores these chunks. Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
2019-10-02MIPS: init: Fix reservation of memory between PHYS_OFFSET and mem startThomas Bogendoerfer1-1/+1
Fix calculation of the size for reserving memory between PHYS_OFFSET and real memory start. Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
2019-08-24mips: avoid explicit UB in assignment of mips_io_port_baseNick Desaulniers1-1/+1
The code in question is modifying a variable declared const through pointer manipulation. Such code is explicitly undefined behavior, and is the lone issue preventing malta_defconfig from booting when built with Clang: If an attempt is made to modify an object defined with a const-qualified type through use of an lvalue with non-const-qualified type, the behavior is undefined. LLVM is removing such assignments. A simple fix is to not declare variables const that you plan on modifying. Limiting the scope would be a better method of preventing unwanted writes to such a variable. Further, the code in question mentions "compiler bugs" without any links to bug reports, so it is difficult to know if the issue is resolved in GCC. The patch was authored in 2006, which would have been GCC 4.0.3 or 4.1.1. The minimal supported version of GCC in the Linux kernel is currently 4.6. For what its worth, there was UB before the commit in question, it just added a barrier and got lucky IRT codegen. I don't think there's any actual compiler bugs related, just runtime bugs due to UB. Link: https://github.com/ClangBuiltLinux/linux/issues/610 Fixes: 966f4406d903 ("[MIPS] Work around bad code generation for <asm/io.h>.") Reported-by: Nathan Chancellor <natechancellor@gmail.com> Debugged-by: Nathan Chancellor <natechancellor@gmail.com> Suggested-by: Eli Friedman <efriedma@quicinc.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: ralf@linux-mips.org Cc: jhogan@kernel.org Cc: Maciej W. Rozycki <macro@linux-mips.org> Cc: Hassan Naveed <hnaveed@wavecomp.com> Cc: Stephen Kitt <steve@sk2.org> Cc: Serge Semin <fancer.lancer@gmail.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: clang-built-linux@googlegroups.com
2019-08-23MIPS: Fix build with CONFIG_PROC_VMCORE=yPaul Burton1-1/+1
Commit a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") introduced a reference to a non-existant "end" field in struct memblock_region. Replace it with a sum of the base & size fields to fix builds with CONFIG_PROC_VMCORE=y. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Paul Burton <paul.burton@mips.com>
2019-08-23MIPS: init: Drop boot_mem_mapJiaxun Yang1-270/+85
boot_mem_map was introduced very early and cannot handle memory maps with nid. Nowadays, memblock can exactly replace boot_mem_map. Detect pfn info and setup resources with memblock maps. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> [paul.burton@mips.com: Fix size calculation in check_kernel_sections_mem] Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-mips@vger.kernel.org Cc: yasha.che3@gmail.com Cc: aurelien@aurel32.net Cc: sfr@canb.auug.org.au Cc: fancer.lancer@gmail.com Cc: matt.redfearn@mips.com Cc: chenhc@lemote.com
2019-05-05mips: Manually call fdt_init_reserved_mem() methodSerge Semin1-0/+3
Since memblock-patchset was introduced the reserved-memory nodes are supported being declared in dt-files. So these nodes are actually parsed during the arch setup procedure when the early_init_fdt_scan_reserved_mem() method is called. But due to the arch-specific boot mem_map container utilization we need to manually call the fdt_init_reserved_mem() method after all the available and reserved memory has been moved to memblock. The first function call performed before bootmem_init() by the early_init_fdt_scan_reserved_mem() routine fails due to the lack of any memblock memory regions to allocate from at that stage. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Bogendoerfer <tbogendoerfer@suse.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Juergen Gross <jgross@suse.com> Cc: Serge Semin <Sergey.Semin@t-platforms.ru> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
2019-05-03mips: Perform early low memory testSerge Semin1-0/+2
memblock subsystem provides a method to optionally test the passed memory region in case if it was requested via special kernel boot argument. Lets add the function at the bottom of the arch_mem_init() method. Testing at this point in the boot sequence should be safe since all critical areas are now reserved and a minimum of allocations have been done. Reviewed-by: Matt Redfearn <matt.redfearn@mips.com> Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Bogendoerfer <tbogendoerfer@suse.de> Cc: Huacai Chen <chenhc@lemote.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Juergen Gross <jgross@suse.com> Cc: Serge Semin <Sergey.Semin@t-platforms.ru> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
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