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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-26 11:25:21 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-26 11:25:21 -0700 |
commit | d207ea8e74ff45be0838afa12bdd2492fa9dc8bc (patch) | |
tree | 97cfb3ed5c1bb42790e98e62b823526f61000b9f /arch/x86 | |
parent | 2a8a2b7c49d6eb5f3348892c4676267376cfd40b (diff) | |
parent | 66e5db4a1ccc64f278653bc69dc406d184dc750a (diff) | |
download | linux-d207ea8e74ff45be0838afa12bdd2492fa9dc8bc.tar.bz2 |
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Thomas Gleixner:
"Kernel:
- Improve kallsyms coverage
- Add x86 entry trampolines to kcore
- Fix ARM SPE handling
- Correct PPC event post processing
Tools:
- Make the build system more robust
- Small fixes and enhancements all over the place
- Update kernel ABI header copies
- Preparatory work for converting libtraceevnt to a shared library
- License cleanups"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (100 commits)
tools arch: Update arch/x86/lib/memcpy_64.S copy used in 'perf bench mem memcpy'
tools arch x86: Update tools's copy of cpufeatures.h
perf python: Fix pyrf_evlist__read_on_cpu() interface
perf mmap: Store real cpu number in 'struct perf_mmap'
perf tools: Remove ext from struct kmod_path
perf tools: Add gzip_is_compressed function
perf tools: Add lzma_is_compressed function
perf tools: Add is_compressed callback to compressions array
perf tools: Move the temp file processing into decompress_kmodule
perf tools: Use compression id in decompress_kmodule()
perf tools: Store compression id into struct dso
perf tools: Add compression id into 'struct kmod_path'
perf tools: Make is_supported_compression() static
perf tools: Make decompress_to_file() function static
perf tools: Get rid of dso__needs_decompress() call in __open_dso()
perf tools: Get rid of dso__needs_decompress() call in symbol__disassemble()
perf tools: Get rid of dso__needs_decompress() call in read_object_code()
tools lib traceevent: Change to SPDX License format
perf llvm: Allow passing options to llc in addition to clang
perf parser: Improve error message for PMU address filters
...
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/mm/cpu_entry_area.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c index b45f5aaefd74..076ebdce9bd4 100644 --- a/arch/x86/mm/cpu_entry_area.c +++ b/arch/x86/mm/cpu_entry_area.c @@ -2,6 +2,8 @@ #include <linux/spinlock.h> #include <linux/percpu.h> +#include <linux/kallsyms.h> +#include <linux/kcore.h> #include <asm/cpu_entry_area.h> #include <asm/pgtable.h> @@ -13,6 +15,7 @@ static DEFINE_PER_CPU_PAGE_ALIGNED(struct entry_stack_page, entry_stack_storage) #ifdef CONFIG_X86_64 static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks [(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]); +static DEFINE_PER_CPU(struct kcore_list, kcore_entry_trampoline); #endif struct cpu_entry_area *get_cpu_entry_area(int cpu) @@ -146,10 +149,40 @@ static void __init setup_cpu_entry_area(int cpu) cea_set_pte(&get_cpu_entry_area(cpu)->entry_trampoline, __pa_symbol(_entry_trampoline), PAGE_KERNEL_RX); + /* + * The cpu_entry_area alias addresses are not in the kernel binary + * so they do not show up in /proc/kcore normally. This adds entries + * for them manually. + */ + kclist_add_remap(&per_cpu(kcore_entry_trampoline, cpu), + _entry_trampoline, + &get_cpu_entry_area(cpu)->entry_trampoline, PAGE_SIZE); #endif percpu_setup_debug_store(cpu); } +#ifdef CONFIG_X86_64 +int arch_get_kallsym(unsigned int symnum, unsigned long *value, char *type, + char *name) +{ + unsigned int cpu, ncpu = 0; + + if (symnum >= num_possible_cpus()) + return -EINVAL; + + for_each_possible_cpu(cpu) { + if (ncpu++ >= symnum) + break; + } + + *value = (unsigned long)&get_cpu_entry_area(cpu)->entry_trampoline; + *type = 't'; + strlcpy(name, "__entry_SYSCALL_64_trampoline", KSYM_NAME_LEN); + + return 0; +} +#endif + static __init void setup_cpu_entry_area_ptes(void) { #ifdef CONFIG_X86_32 |