linux-kernel - [tip:perf/core] x86: Make save_stack_address() !CONFIG_FRAME

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Message-ID: <tip-147ec4d2361e355ab32499f739cc24845ceb89da@git.kernel.org>
Date:	Wed, 9 Jun 2010 18:17:00 GMT
From:	tip-bot for Oleg Nesterov <oleg@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	arjan@...ux.intel.com, vegard.nossum@...il.com, fweisbec@...il.com,
	roland@...hat.com, akpm@...ux-foundation.org, tglx@...utronix.de,
	oleg@...hat.com, mingo@...e.hu
Subject: [tip:perf/core] x86: Make save_stack_address() !CONFIG_FRAME_POINTER friendly

Commit-ID:  147ec4d2361e355ab32499f739cc24845ceb89da
Gitweb:     http://git.kernel.org/tip/147ec4d2361e355ab32499f739cc24845ceb89da
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Thu, 3 Jun 2010 21:32:39 +0200
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Wed, 9 Jun 2010 17:32:15 +0200

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 <oleg@...hat.com>
Cc: Roland McGrath <roland@...hat.com>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Vegard Nossum <vegard.nossum@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>
LKML-Reference: <20100603193239.GA31530@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/stacktrace.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index ea54d02..abc321d 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) {
--
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