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2014-07-28Merge tag 'v3.16-rc7' into perf/core, to merge in the latest fixes before ↵Ingo Molnar6-8/+24
applying new changes Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-06-26ARC: [SMP] Fix IPI IRQ registrationNoam Camus1-2/+13
Handle it just like timer. Current request_percpu_irq() would fail on non-boot cpus and thus IRQ will remian unmasked on those cpus. [vgupta: fix changelong] Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)Anton Kolesov1-0/+4
This patch adds implementation of GET_THREAD_AREA ptrace request type. This is required by GDB to debug NPTL applications. Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26ARC: optimize kernel bss clearing in early boot codeVineet Gupta2-4/+5
using ARC ZOL which reduces tot num of instructions by half Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-26ARC: Fix build breakage for !CONFIG_ARC_DW2_UNWINDVineet Gupta1-1/+1
Fixes: ec7ac6afd07b (ARC: switch to generic ENTRY/END assembler annotations) Reported-by: Anton Kolesov <akolesov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-23ARC: fix build warning in devtreeVineet Gupta1-1/+1
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-18arc, perf: Use common PMU interrupt disabled codeVince Weaver1-4/+3
Transition to using the new generic PERF_PMU_CAP_NO_INTERRUPT method for failing a sampling event when no PMU interrupt is available. Signed-off-by: Vince Weaver <vincent.weaver@maine.edu> Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Grant Likely <grant.likely@linaro.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Rob Herring <robh+dt@kernel.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1406150159280.16738@vincent-weaver-1.umelst.maine.edu Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-06-09Merge tag 'arc-v3.16-rc1' of ↵Linus Torvalds6-33/+71
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC updates from Vineet Gupta: "Nothing too exciting here, just minor fixes/cleanup. Only noteworthy ones are: - Moving cache disabling to early boot - ARC UART enabled only if earlyprintk setup in cmdline" * tag 'arc-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: Disable caches in early boot if so configured ARC: [arcfpga] Early ARC UART to be only activated by cmdline ARC: [arcfpga] Get rid of legacy BVCI latency unit support ARC: remove duplicate header exports ARC: arc_local_timer_setup() need not pass own cpu id ARC: Fixed spelling errors within comments ARC: make start_thread() out-of-line ARC: fix mmuv2 warning ARC: [SMP] ISS SMP extension bitrot
2014-06-04arc: call find_vma with the mmap_sem heldDavidlohr Bueso1-4/+6
Performing vma lookups without taking the mm->mmap_sem is asking for trouble. While doing the search, the vma in question can be modified or even removed before returning to the caller. Take the lock (shared) in order to avoid races while iterating through the vmacache and/or rbtree. [akpm@linux-foundation.org: CSE current->active_mm, per Vineet] Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-03ARC: Disable caches in early boot if so configuredVineet Gupta1-3/+35
Requested-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-06-03ARC: arc_local_timer_setup() need not pass own cpu idVineet Gupta2-6/+7
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-13Merge branch 'dt-bus-name' into for-nextRob Herring1-3/+5
2014-05-05ARC: Fixed spelling errors within commentsTerence Eden1-6/+6
[vgupta: fixed changelong + added Randy's suggestion] Signed-off-by: Terence Eden <github.com@shkspr.mobi> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05ARC: make start_thread() out-of-lineVineet Gupta1-0/+23
Helps move out ISA specific bits from a arch exported header Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-05-05ARC: [SMP] ISS SMP extension bitrotVineet Gupta1-18/+0
* Move extension specific code out of common SMP code * Don't enable it by default for SMP Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-04-30ARC: !PREEMPT: Ensure Return to kernel mode is IRQ safeVineet Gupta1-3/+5
There was a very small race window where resume to kernel mode from a Exception Path (or pure kernel mode which is true for most of ARC exceptions anyways), was not disabling interrupts in restore_regs, clobbering the exception regs Anton found the culprit call flow (after many sleepless nights) | 1. we got a Trap from user land | 2. started to service it. | 3. While doing some stuff on user-land memory (I think it is padzero()), | we got a DataTlbMiss | 4. On return from it we are taking "resume_kernel_mode" path | 5. NEED_RESHED is not set, so we go to "return from exception" path in | restore regs. | 6. there seems to be IRQ happening Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: <stable@vger.kernel.org> #3.10, 3.12, 3.13, 3.14 Cc: Anton Kolesov <Anton.Kolesov@synopsys.com> Cc: Francois Bedard <Francois.Bedard@synopsys.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-30of/fdt: update of_get_flat_dt_prop in prep for libfdtRob Herring1-1/+1
Make of_get_flat_dt_prop arguments compatible with libfdt fdt_getprop call in preparation to convert FDT code to use libfdt. Make the return value const and the property length ptr type an int. Signed-off-by: Rob Herring <robh@kernel.org> Tested-by: Michal Simek <michal.simek@xilinx.com> Tested-by: Grant Likely <grant.likely@linaro.org> Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-05ARC: [SMP] General FixesVineet Gupta1-3/+4
-Pass the expected arg to non-boot park'ing routine (It worked so far because existing SMP backends don't use the arg) -CONFIG_DEBUG_PREEMPT warning
2014-03-26ARC: [clockevent] simplify timer ISRVineet Gupta1-19/+15
* Remove one liner IRQ ACK accessor, it was coming in the way of readability. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26ARC: [clockevent] can't be SoC specificVineet Gupta1-2/+1
So no point keeping it weak Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-03-26ARC: switch to generic ENTRY/END assembler annotationsVineet Gupta2-27/+27
With commit 9df62f054406 "arch: use ASM_NL instead of ';'" the generic macros can handle the arch specific newline quirk. Hence we can get rid of ARC asm macros and use the "C" style macros. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-01-16ARC: [cmdline] support External Device Trees from u-bootVineet Gupta1-3/+12
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2014-01-16ARC: [cmdline] uboot cmdline handling reworkVineet Gupta2-31/+34
* Moved cmdline copy from asm to "C" - allows for more robust checking of pointer validity etc. * Remove the Kconfig option to do so, base it on a runtime value passed by u-boot Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] optimize IPI send and receiveVineet Gupta1-28/+40
* Don't send an IPI if receiver already has a pending IPI. Atomically piggyback the new msg with pending msg. * IPI receiver looping on xchg() not required References: https://lkml.org/lkml/2013/11/25/232 Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] simplify IPI codeVineet Gupta1-28/+28
* ipi_data is just a word, no need to keep it as struct * find_next_bit() not needed to loop thru a 32bit word, ffs suffices
2013-12-23ARC: [SMP] cpu halt interface doesn't need "self" cpu-idVineet Gupta1-5/+4
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] IPI ACK interface doesn't need "self" cpu-idVineet Gupta1-1/+1
The interface is confusing, it feels like we are getting "sender" info, whereas it is the "receiver", which can very well be retrived by smp_processor_id(), if need be. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-12-23ARC: [SMP] cpumask not needed in IPI send pathVineet Gupta1-9/+14
The current IPI sending callstack needlessly involves cpumask. arch_send_call_function_single_ipi(cpu) / smp_send_reschedule(cpu) ipi_send_msg(cpumask_of(cpu)) --> [cpu to cpumask] plat_smp_ops.ipi_send(callmap) for_each_cpu(callmap) --> [cpuask to cpu] do_plat_specific_ipi_PER_CPU Given that current backends are not capable of 1:N IPIs, lets simplify the interface for now, by keeping "a" cpu all along. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-28ARC: [perf] Fix a few thinkosVineet Gupta1-2/+2
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-19Merge tag 'arc-v3.13-rc1-part2' of ↵Linus Torvalds2-0/+327
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull second set of ARC changes from Vineet Gupta: - Support for Perf from Mischa - Enabling GPIO/Pinctrl drivers for Abilis TB10x platform - New defconfig for buildroot * tag 'arc-v3.13-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: [plat-arcfpga] Add defconfig without initramfs location ARC: perf: ARC 700 PMU doesn't support sampling events ARC: Add documentation on DT binding for ARC700 PMU ARC: Add perf support for ARC700 cores ARC: [TB10x] Updates for GPIO and pinctrl
2013-11-15Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree updates from Jiri Kosina: "Usual earth-shaking, news-breaking, rocket science pile from trivial.git" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (23 commits) doc: usb: Fix typo in Documentation/usb/gadget_configs.txt doc: add missing files to timers/00-INDEX timekeeping: Fix some trivial typos in comments mm: Fix some trivial typos in comments irq: Fix some trivial typos in comments NUMA: fix typos in Kconfig help text mm: update 00-INDEX doc: Documentation/DMA-attributes.txt fix typo DRM: comment: `halve' -> `half' Docs: Kconfig: `devlopers' -> `developers' doc: typo on word accounting in kprobes.c in mutliple architectures treewide: fix "usefull" typo treewide: fix "distingush" typo mm/Kconfig: Grammar s/an/a/ kexec: Typo s/the/then/ Documentation/kvm: Update cpuid documentation for steal time and pv eoi treewide: Fix common typo in "identify" __page_to_pfn: Fix typo in comment Correct some typos for word frequency clk: fixed-factor: Fix a trivial typo ...
2013-11-15ARC: perf: ARC 700 PMU doesn't support sampling eventsMischa Jonker1-0/+4
The ARC 700 does not have an interrupt associated with it, and as such it cannot trigger when a counter overflows. As the counters are 48 bit, it will usually take at least 100 days before a counter overflows, so for mere counting of events, there is no problem. Sampling is not supported though. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-12Merge tag 'devicetree-for-3.13' of ↵Linus Torvalds2-81/+22
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull devicetree updates from Rob Herring: "DeviceTree updates for 3.13. This is a bit larger pull request than usual for this cycle with lots of clean-up. - Cross arch clean-up and consolidation of early DT scanning code. - Clean-up and removal of arch prom.h headers. Makes arch specific prom.h optional on all but Sparc. - Addition of interrupts-extended property for devices connected to multiple interrupt controllers. - Refactoring of DT interrupt parsing code in preparation for deferred probe of interrupts. - ARM cpu and cpu topology bindings documentation. - Various DT vendor binding documentation updates" * tag 'devicetree-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (82 commits) powerpc: add missing explicit OF includes for ppc dt/irq: add empty of_irq_count for !OF_IRQ dt: disable self-tests for !OF_IRQ of: irq: Fix interrupt-map entry matching MIPS: Netlogic: replace early_init_devtree() call of: Add Panasonic Corporation vendor prefix of: Add Chunghwa Picture Tubes Ltd. vendor prefix of: Add AU Optronics Corporation vendor prefix of/irq: Fix potential buffer overflow of/irq: Fix bug in interrupt parsing refactor. of: set dma_mask to point to coherent_dma_mask of: add vendor prefix for PHYTEC Messtechnik GmbH DT: sort vendor-prefixes.txt of: Add vendor prefix for Cadence of: Add empty for_each_available_child_of_node() macro definition arm/versatile: Fix versatile irq specifications. of/irq: create interrupts-extended property microblaze/pci: Drop PowerPC-ism from irq parsing of/irq: Create of_irq_parse_and_map_pci() to consolidate arch code. of/irq: Use irq_of_parse_and_map() ...
2013-11-12ARC: Add perf support for ARC700 coresMischa Jonker2-0/+323
This adds basic perf support for ARC700 cores. Most PERF_COUNT_HW* events are supported now. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-07Merge remote-tracking branch 'grant/devicetree/next' into for-nextRob Herring4-18/+22
2013-11-07smp, ARC: kill SMP single function call interruptJiang Liu1-6/+1
Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic similar to smp_call_function_single()" has unified the way to handle single and multiple cross-CPU function calls. Now only one interrupt is needed for architecture specific code to support generic SMP function call interfaces, so kill the redundant single function call interrupt. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Jiang Liu <liuj97@gmail.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-07ARC: [SMP] Disallow RTSCVineet Gupta1-3/+4
RTSC is strictly incore and must not be allowed in SMP configs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: [SMP] Fix build failures for large NR_CPUSVineet Gupta2-3/+21
ST.as only takes S9 (255) for offset. This was going out of range when accessing a task_struct field with 4k NR_CPUS (due to 128b of coumaks itself in there). Workaround by using an intermediate register to do the address scaling. There is some duplication of fix for ctx_sw.c and ctx_sw_asm.S however given that C version will go away soon I'm not bothering to factor out the common code. Reported-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: [SMP] TLB flushVineet Gupta1-0/+1
- Add mm_cpumask setting (aggregating only, unlike some other arches) used to restrict the TLB flush cross-calling - cross-calling versions of TLB flush routines (thanks to Noam) Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06arc: export symbol for pm_power_off in reset.cChen Gang1-0/+1
Need export symbol for it, or can not pass compiling, the related error with allmodconfig: MODPOST 2994 modules ERROR: "pm_power_off" [drivers/mfd/retu-mfd.ko] undefined! ERROR: "pm_power_off" [drivers/char/ipmi/ipmi_poweroff.ko] undefined! Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06arc: export symbol for save_stack_trace() in stacktrace.cChen Gang1-0/+1
Need export its symbol just like other architectures done, or can not pass compiling with allmodconfig, the related error: MODPOST 2994 modules ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined! ERROR: "save_stack_trace" [drivers/md/persistent-data/dm-persistent-data.ko] undefined! Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06arc: remove '__init' for get_hw_config_num_irq()Chen Gang1-1/+1
get_hw_config_num_irq() may be called by normal iss_model_init_smp() which is a function pointer for 'init_smp' which may be called by first_lines_of_secondary() which also need be normal too. The related warning (with allmodconfig): MODPOST vmlinux.o WARNING: vmlinux.o(.text+0x5814): Section mismatch in reference from the function iss_model_init_smp() to the function .init.text:get_hw_config_num_irq() The function iss_model_init_smp() references the function __init get_hw_config_num_irq(). This is often because iss_model_init_smp lacks a __init annotation or the annotation of get_hw_config_num_irq is wrong. Signed-off-by: Chen Gang <gang.chen@asianux.com>
2013-11-06arc: remove '__init' for first_lines_of_secondary()Chen Gang1-1/+1
first_lines_of_secondary() is a '__init' function, but it may be called by __cpu_up() by _cpu_up() by cpu_up() which is a normal export symbol function. So recommend to remove '__init'. The related warning (with allmodconfig): MODPOST vmlinux.o WARNING: vmlinux.o(.text+0x315c): Section mismatch in reference from the function __cpu_up() to the function .init.text:first_lines_of_secondary() The function __cpu_up() references the function __init first_lines_of_secondary(). This is often because __cpu_up lacks a __init annotation or the annotation of first_lines_of_secondary is wrong. Signed-off-by: Chen Gang <gang.chen@asianux.com>
2013-11-06arc: kgdb: add default implementation for kgdb_roundup_cpus()Chen Gang1-0/+12
arc supports kgdb, but need update -- add function kgdb_roundup_cpus(), or can not pass compiling. At present, add the simple generic one just like other architectures(e.g. tile, mips ...). The related error (with allmodconfig): kernel/built-in.o: In function `kgdb_cpu_enter': kernel/debug/debug_core.c:580: undefined reference to `kgdb_roundup_cpus' Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Add support for irqflags tracing and lockdepVineet Gupta2-1/+14
Lockdep required a small fix to stacktrace API which was incorrectly unwindign out of __switch_to for the current call frame. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Reset the value of Interrupt Priority RegisterVineet Gupta1-3/+7
In case bootloader has changed the priority of one/more IRQ lines Reported-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Reduce #ifdef'ery for unaligned access emulationVineet Gupta2-6/+1
Emulation not enabled is treated as if the fixup failed, so no need for special #ifdef checks. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Change calling convention of do_page_fault()Vineet Gupta1-5/+4
switch the args (address, pt_regs) to match with all the other "C" exception handlers. This removes the awkwardness in EV_ProtV for page fault vs. unaligned access. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: use __weak instead of __attribute__((weak))Vineet Gupta2-2/+2
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2013-11-06ARC: Annotate some functions as staticVineet Gupta1-6/+5
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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