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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2010-05-20 07:47:21 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-06-08 23:31:27 +0200 |
| commit | b0f82b81fe6bbcf78d478071f33e44554726bc81 (patch) | |
| tree | 6305c095b927f956a791b9dce687cb94a21718e6 /arch/x86/include | |
| parent | c9cf4dbb4d9ca715d8fedf13301a53296429abc6 (diff) | |
| download | linux-0-day-b0f82b81fe6bbcf78d478071f33e44554726bc81.tar.gz linux-0-day-b0f82b81fe6bbcf78d478071f33e44554726bc81.tar.xz | |
perf: Drop the skip argument from perf_arch_fetch_regs_caller
Drop this argument now that we always want to rewind only to the
state of the first caller.
It means frame pointers are not necessary anymore to reliably get
the source of an event. But this also means we need this helper
to be a macro now, as an inline function is not an option since
we need to know when to provide a default implentation.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/perf_event.h | 13 | ||||
| -rw-r--r-- | arch/x86/include/asm/stacktrace.h | 7 |
2 files changed, 15 insertions, 5 deletions
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 254883d0c7e08..02de29830ffef 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -140,6 +140,19 @@ extern unsigned long perf_instruction_pointer(struct pt_regs *regs); extern unsigned long perf_misc_flags(struct pt_regs *regs); #define perf_misc_flags(regs) perf_misc_flags(regs) +#include <asm/stacktrace.h> + +/* + * We abuse bit 3 from flags to pass exact information, see perf_misc_flags + * and the comment with PERF_EFLAGS_EXACT. + */ +#define perf_arch_fetch_caller_regs(regs, __ip) { \ + (regs)->ip = (__ip); \ + (regs)->bp = caller_frame_pointer(); \ + (regs)->cs = __KERNEL_CS; \ + regs->flags = 0; \ +} + #else static inline void init_hw_perf_events(void) { } static inline void perf_events_lapic_init(void) { } diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h index a957463d3c7ac..2b16a2ad23dc6 100644 --- a/arch/x86/include/asm/stacktrace.h +++ b/arch/x86/include/asm/stacktrace.h @@ -78,17 +78,14 @@ struct stack_frame_ia32 { u32 return_address; }; -static inline unsigned long rewind_frame_pointer(int n) +static inline unsigned long caller_frame_pointer(void) { struct stack_frame *frame; get_bp(frame); #ifdef CONFIG_FRAME_POINTER - while (n--) { - if (probe_kernel_address(&frame->next_frame, frame)) - break; - } + frame = frame->next_frame; #endif return (unsigned long)frame; |