linux-kernel - [PATCH 1/2] make arch_init_ftrace

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Message-Id: <1238941074-27424-2-git-send-email-fche@elastic.org>
Date:	Sun,  5 Apr 2009 10:17:53 -0400
From:	"Frank Ch. Eigler" <fche@...stic.org>
To:	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Cc:	systemtap@...rces.redhat.com, fweisbec@...il.com,
	rostedt@...dmis.org, mingo@...e.hu,
	"Frank Ch. Eigler" <fche@...stic.org>
Subject: [PATCH 1/2] make arch_init_ftrace_syscalls multiply callable

Since both the utrace-based ftrace engine and the original
syscall-specific ftrace engine use the syscall pretty-printer, this
initialization function needs to be callable from each of them.

Signed-off-by: Frank Ch. Eigler <fche@...stic.org>
---
 arch/x86/kernel/ftrace.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 1d0d7f4..1d99d3d 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -498,6 +498,9 @@ void arch_init_ftrace_syscalls(void)
 	if (atomic_inc_return(&refs) != 1)
 		goto end;
 
+        if (syscalls_metadata)
+                return;
+
 	syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
 					FTRACE_SYSCALL_MAX, GFP_KERNEL);
 	if (!syscalls_metadata) {
-- 
1.6.0.6

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