diff options
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 6 | ||||
| -rw-r--r-- | kernel/trace/trace_event_perf.c | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index fd4db0d..c775860 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1717,7 +1717,11 @@ void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int ski */ regs->bp = rewind_frame_pointer(skip + 1); regs->cs = __KERNEL_CS; - local_save_flags(regs->flags); + /* + * We abuse bit 3 to pass exact information, see perf_misc_flags + * and the comment with PERF_EFLAGS_EXACT. + */ + regs->flags = 0; } unsigned long perf_instruction_pointer(struct pt_regs *regs) diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 26b8607..cb6f365 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -157,6 +157,7 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned short type, struct pt_regs *regs, int *rctxp) { struct trace_entry *entry; + unsigned long flags; char *raw_data; int pc; @@ -174,7 +175,8 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned short type, memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64)); entry = (struct trace_entry *)raw_data; - tracing_generic_entry_update(entry, regs->flags, pc); + local_save_flags(flags); + tracing_generic_entry_update(entry, flags, pc); entry->type = type; return raw_data; |