The patch titled
Subject: arm64: stacktrace: avoid listing stacktrace functions in stacktrace
has been added to the -mm tree. Its filename is
arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace.patch
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------------------------------------------------------
From: Prakash Gupta <guptap@xxxxxxxxxxxxxx>
Subject: arm64: stacktrace: avoid listing stacktrace functions in stacktrace
The stacktraces always begin as follows:
[<c00117b4>] save_stack_trace_tsk+0x0/0x98
[<c0011870>] save_stack_trace+0x24/0x28
...
This is because the stack trace code includes the stack frames for itself.
This is incorrect behaviour, and also leads to "skip" doing the wrong
thing (which is the number of stack frames to avoid recording.)
Perversely, it does the right thing when passed a non-current thread. Fix
this by ensuring that we have a known constant number of frames above the
main stack trace function, and always skip these.
This was fixed for arch arm by 3683f44c42e9 ("ARM: stacktrace: avoid
listing stacktrace functions in stacktrace")
Link: http://lkml.kernel.org/r/1504078343-28754-1-git-send-email-guptap@xxxxxxxxxxxxxx
Signed-off-by: Prakash Gupta <guptap@xxxxxxxxxxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/stacktrace.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff -puN arch/arm64/kernel/stacktrace.c~arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace arch/arm64/kernel/stacktrace.c
--- a/arch/arm64/kernel/stacktrace.c~arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace
+++ a/arch/arm64/kernel/stacktrace.c
@@ -140,7 +140,8 @@ void save_stack_trace_regs(struct pt_reg
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+static noinline void __save_stack_trace(struct task_struct *tsk,
+ struct stack_trace *trace, unsigned int nosched)
{
struct stack_trace_data data;
struct stackframe frame;
@@ -150,15 +151,16 @@ void save_stack_trace_tsk(struct task_st
data.trace = trace;
data.skip = trace->skip;
+ data.no_sched_functions = nosched;
if (tsk != current) {
- data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.pc = thread_saved_pc(tsk);
} else {
- data.no_sched_functions = 0;
+ /* We don't want this function nor the caller */
+ data.skip += 2;
frame.fp = (unsigned long)__builtin_frame_address(0);
- frame.pc = (unsigned long)save_stack_trace_tsk;
+ frame.pc = (unsigned long)__save_stack_trace;
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = tsk->curr_ret_stack;
@@ -172,9 +174,15 @@ void save_stack_trace_tsk(struct task_st
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ __save_stack_trace(tsk, trace, 1);
+}
+
void save_stack_trace(struct stack_trace *trace)
{
- save_stack_trace_tsk(current, trace);
+ __save_stack_trace(current, trace, 0);
}
+
EXPORT_SYMBOL_GPL(save_stack_trace);
#endif
_
Patches currently in -mm which might be from guptap@xxxxxxxxxxxxxx are
arm64-stacktrace-avoid-listing-stacktrace-functions-in-stacktrace.patch
mm-page_owner-skip-unnecessary-stack_trace-entries.patch
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