linux-kernel - [tip:tracing/core] tracing/function-graph: x86

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Message-ID: <tip-4818d80942b7c0021d213b7c5f1a14a832820a01@git.kernel.org>
Date:	Sun, 13 Sep 2009 15:02:35 GMT
From:	tip-bot for Jiri Olsa <jolsa@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, tglx@...utronix.de, jolsa@...hat.com
Subject: [tip:tracing/core] tracing/function-graph: x86_64 stack allocation cleanup

Commit-ID:  4818d80942b7c0021d213b7c5f1a14a832820a01
Gitweb:     http://git.kernel.org/tip/4818d80942b7c0021d213b7c5f1a14a832820a01
Author:     Jiri Olsa <jolsa@...hat.com>
AuthorDate: Wed, 29 Jul 2009 10:58:37 +0200
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Sat, 12 Sep 2009 22:13:43 -0400

tracing/function-graph: x86_64 stack allocation cleanup

Only 24 bytes needs to be reserved on the stack for the function graph
tracer on x86_64.

Signed-off-by: Jiri Olsa <jolsa@...hat.com>
LKML-Reference: <20090729085837.GB4998@...sa.lab.eng.brq.redhat.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>


---
 arch/x86/kernel/entry_64.S |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c251be7..d59fe32 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -146,7 +146,7 @@ ENTRY(ftrace_graph_caller)
 END(ftrace_graph_caller)
 
 GLOBAL(return_to_handler)
-	subq  $80, %rsp
+	subq  $24, %rsp
 
 	/* Save the return values */
 	movq %rax, (%rsp)
@@ -155,10 +155,10 @@ GLOBAL(return_to_handler)
 
 	call ftrace_return_to_handler
 
-	movq %rax, 72(%rsp)
+	movq %rax, 16(%rsp)
 	movq 8(%rsp), %rdx
 	movq (%rsp), %rax
-	addq $72, %rsp
+	addq $16, %rsp
 	retq
 #endif
 
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