Messages in this thread Patch in this message | | | From | madvenka@linux ... | Subject | [PATCH v10 06/11] arm64: Make profile_pc() use arch_stack_walk() | Date | Thu, 14 Oct 2021 21:58:42 -0500 |
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From: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
Currently, profile_pc() in ARM64 code walks the stack using start_backtrace() and unwind_frame(). Make it use arch_stack_walk() instead. This makes maintenance easier.
Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> --- arch/arm64/kernel/time.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c index eebbc8d7123e..671b3038a772 100644 --- a/arch/arm64/kernel/time.c +++ b/arch/arm64/kernel/time.c @@ -32,22 +32,26 @@ #include <asm/stacktrace.h> #include <asm/paravirt.h> +static bool profile_pc_cb(void *arg, unsigned long pc) +{ + unsigned long *prof_pc = arg; + + if (in_lock_functions(pc)) + return true; + *prof_pc = pc; + return false; +} + unsigned long profile_pc(struct pt_regs *regs) { - struct stackframe frame; + unsigned long prof_pc = 0; if (!in_lock_functions(regs->pc)) return regs->pc; - start_backtrace(&frame, regs->regs[29], regs->pc); - - do { - int ret = unwind_frame(NULL, &frame); - if (ret < 0) - return 0; - } while (in_lock_functions(frame.pc)); + arch_stack_walk(profile_pc_cb, &prof_pc, current, regs); - return frame.pc; + return prof_pc; } EXPORT_SYMBOL(profile_pc); -- 2.25.1
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