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Date: Wed, 1 Nov 2017 22:26:11 +0100 From: Willy Tarreau <w@....eu> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, linux@...ck-us.net Cc: Marcin Nowakowski <marcin.nowakowski@...tec.com>, Peter Zijlstra <peterz@...radead.org>, Thomas Meyer <thomas@...3r.de>, Ingo Molnar <mingo@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Daniel Borkmann <daniel@...earbox.net>, Paul Gortmaker <paul.gortmaker@...driver.com>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Willy Tarreau <w@....eu> Subject: [PATCH 3.10 070/139] kernel/extable.c: mark core_kernel_text notrace From: Marcin Nowakowski <marcin.nowakowski@...tec.com> commit c0d80ddab89916273cb97114889d3f337bc370ae upstream. core_kernel_text is used by MIPS in its function graph trace processing, so having this method traced leads to an infinite set of recursive calls such as: Call Trace: ftrace_return_to_handler+0x50/0x128 core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 return_to_handler+0x10/0x30 return_to_handler+0x0/0x30 return_to_handler+0x0/0x30 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 (...) Mark the function notrace to avoid it being traced. Link: http://lkml.kernel.org/r/1498028607-6765-1-git-send-email-marcin.nowakowski@imgtec.com Signed-off-by: Marcin Nowakowski <marcin.nowakowski@...tec.com> Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Meyer <thomas@...3r.de> Cc: Ingo Molnar <mingo@...nel.org> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Daniel Borkmann <daniel@...earbox.net> Cc: Paul Gortmaker <paul.gortmaker@...driver.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: <stable@...r.kernel.org> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Willy Tarreau <w@....eu> --- kernel/extable.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/extable.c b/kernel/extable.c index 67460b9..5ec4b6f 100644 --- a/kernel/extable.c +++ b/kernel/extable.c @@ -66,7 +66,7 @@ static inline int init_kernel_text(unsigned long addr) return 0; } -int core_kernel_text(unsigned long addr) +int notrace core_kernel_text(unsigned long addr) { if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) -- 2.8.0.rc2.1.gbe9624a
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