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Subject[PATCH 2/2] perf: Drop useless check for ignored frame
Date
The check that ignores the debug and nmi stack frames is useless
now that we have a frame pointer that makes us start at the right
place. We don't anymore have to deal with these.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
---
arch/x86/include/asm/stacktrace.h | 2 --
arch/x86/kernel/cpu/perf_event.c | 8 --------
arch/x86/kernel/dumpstack_32.c | 5 -----
arch/x86/kernel/dumpstack_64.c | 5 -----
4 files changed, 0 insertions(+), 20 deletions(-)
diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index 35e8912..4dab78e 100644
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -3,8 +3,6 @@

extern int kstack_depth_to_print;

-int x86_is_stack_id(int id, char *name);
-
struct thread_info;
struct stacktrace_ops;

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index d616c06..b1bb8c5 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -2297,7 +2297,6 @@ void callchain_store(struct perf_callchain_entry *entry, u64 ip)

static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry);
static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_nmi_entry);
-static DEFINE_PER_CPU(int, in_ignored_frame);


static void
@@ -2313,10 +2312,6 @@ static void backtrace_warning(void *data, char *msg)

static int backtrace_stack(void *data, char *name)
{
- per_cpu(in_ignored_frame, smp_processor_id()) =
- x86_is_stack_id(NMI_STACK, name) ||
- x86_is_stack_id(DEBUG_STACK, name);
-
return 0;
}

@@ -2324,9 +2319,6 @@ static void backtrace_address(void *data, unsigned long addr, int reliable)
{
struct perf_callchain_entry *entry = data;

- if (per_cpu(in_ignored_frame, smp_processor_id()))
- return;
-
if (reliable)
callchain_store(entry, addr);
}
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index ae775ca..11540a1 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -18,11 +18,6 @@

#include "dumpstack.h"

-/* Just a stub for now */
-int x86_is_stack_id(int id, char *name)
-{
- return 0;
-}

void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 0ad9597..676bc05 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -33,11 +33,6 @@ static char x86_stack_ids[][8] = {
#endif
};

-int x86_is_stack_id(int id, char *name)
-{
- return x86_stack_ids[id - 1] == name;
-}
-
static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
unsigned *usedp, char **idp)
{
--
1.6.2.3


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