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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2015-12-15 17:33:40 +0900
committerWill Deacon <will.deacon@arm.com>2015-12-21 17:26:01 +0000
commitfe13f95b720075327a761fe6ddb45b0c90cab504 (patch)
tree60a9b93da92658289371e6bb2307401bba4bdc5e /arch/arm64/kernel/perf_callchain.c
parent79fdee9b6355c9720f14717e1ad66af51bb331b5 (diff)
arm64: pass a task parameter to unwind_frame()
Function graph tracer modifies a return address (LR) in a stack frame to hook a function's return. This will result in many useless entries (return_to_handler) showing up in a call stack list. We will fix this problem in a later patch ("arm64: ftrace: fix a stack tracer's output under function graph tracer"). But since real return addresses are saved in ret_stack[] array in struct task_struct, unwind functions need to be notified of, in addition to a stack pointer address, which task is being traced in order to find out real return addresses. This patch extends unwind functions' interfaces by adding an extra argument of a pointer to task_struct. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/perf_callchain.c')
-rw-r--r--arch/arm64/kernel/perf_callchain.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/perf_callchain.c b/arch/arm64/kernel/perf_callchain.c
index 3aa74830cc69..797220da912b 100644
--- a/arch/arm64/kernel/perf_callchain.c
+++ b/arch/arm64/kernel/perf_callchain.c
@@ -165,7 +165,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
frame.sp = regs->sp;
frame.pc = regs->pc;
- walk_stackframe(&frame, callchain_trace, entry);
+ walk_stackframe(current, &frame, callchain_trace, entry);
}
unsigned long perf_instruction_pointer(struct pt_regs *regs)