Messages in this thread Patch in this message | | | Date | Thu, 3 Jun 2010 21:32:39 +0200 | From | Oleg Nesterov <> | Subject | [PATCH 1/2] x86: make save_stack_address() !CONFIG_FRAME_POINTER friendly |
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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 <oleg@redhat.com> ---
arch/x86/kernel/stacktrace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- 34-rc1/arch/x86/kernel/stacktrace.c~SAVE_STACK_WO_FP 2010-06-03 18:43:27.000000000 +0200 +++ 34-rc1/arch/x86/kernel/stacktrace.c 2010-06-03 21:29:52.000000000 +0200 @@ -26,8 +26,10 @@ static int save_stack_stack(void *data, 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 *dat 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) {
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