linux-kernel - [PATCH] kgdb: more barrier in blank weak function

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Message-ID: <4955B7EC.7050002@kernel.org>
Date:	Fri, 26 Dec 2008 21:06:52 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Sam Ravnborg <sam@...nborg.org>,
	David Howells <dhowells@...hat.com>, mingo@...e.hu
CC:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	mel@....ul.ie
Subject: [PATCH] kgdb: more barrier in blank weak function


Impact: fix panic possible panic etc

some compiler seems to inline the weak global function if no line in it

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index e4dcfb2..70d2e36 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -223,7 +223,7 @@ int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
 void __weak
 kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
 {
-	return;
+	barrier();
 }
 
 /**
@@ -236,6 +236,7 @@ kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
  */
 void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
 {
+	barrier();
 }
 
 /*
--
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