From 147ec4d2361e355ab32499f739cc24845ceb89da Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 3 Jun 2010 21:32:39 +0200 Subject: [PATCH] x86: Make save_stack_address() !CONFIG_FRAME_POINTER friendly If CONFIG_FRAME_POINTER=n, print_context_stack() shouldn't neglect the non-reliable addresses on stack, this is all we have if dump_trace(bp) is called with the wrong or zero bp. For example, /proc/pid/stack doesn't work if CONFIG_FRAME_POINTER=n. This patch obviously has no effect if CONFIG_FRAME_POINTER=y, otherwise it reverts 1650743c "x86: don't save unreliable stack trace entries". Also, remove the unnecessary type-cast. Signed-off-by: Oleg Nesterov Cc: Roland McGrath Cc: Arjan van de Ven Cc: Vegard Nossum Cc: Ingo Molnar Cc: Andrew Morton LKML-Reference: <20100603193239.GA31530@redhat.com> Signed-off-by: Frederic Weisbecker --- arch/x86/kernel/stacktrace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index ea54d029fe27..abc321d55870 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -26,8 +26,10 @@ static int save_stack_stack(void *data, char *name) static void save_stack_address(void *data, unsigned long addr, int reliable) { struct stack_trace *trace = data; +#ifdef CONFIG_FRAME_POINTER if (!reliable) return; +#endif if (trace->skip > 0) { trace->skip--; return; @@ -39,9 +41,11 @@ static void save_stack_address(void *data, unsigned long addr, int reliable) static void save_stack_address_nosched(void *data, unsigned long addr, int reliable) { - struct stack_trace *trace = (struct stack_trace *)data; + struct stack_trace *trace = data; +#ifdef CONFIG_FRAME_POINTER if (!reliable) return; +#endif if (in_sched_functions(addr)) return; if (trace->skip > 0) {