linux-kernel - Re: [PATCH 2/6]kernel:audit.c Fix warning: variable 'nlh' set but not used

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Message-ID: <4C1C4B55.8070209@gmail.com>
Date:	Fri, 18 Jun 2010 21:45:09 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	zippel@...ux-m68k.org, linux-fsdevel@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [PATCH 2/6]kernel:audit.c Fix warning: variable 'nlh' set but
 not 	used


>
> This is not dead code. NLMSG_NEW() sets up an nlmsg in ab->skb.
> If you remove the code, it's no longer initialized.

I played around with this code some more, but am still getting confused 
with nlmsg_new and NLMSG_NEW. if I remove the nlmsghdr struct I can get 
a clean build without a warning, but still am a bit confused.

here is an updated patch let me know if it still needs work..
or if it's legit I can resend this.

 From 7515a08ba921d3beed33fa5c6b1fbe59cf52e069 Mon Sep 17 00:00:00 2001
From: Justin P. Mattock <justinmattock@...il.com>
Date: Fri, 18 Jun 2010 19:44:30 -0700
Subject: [PATCH 4/4] audit
  Signed-off-by: Justin P. Mattock <justinmattock@...il.com>

---
  kernel/audit.c |    3 +--
  1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index c71bd26..1d51258 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1041,7 +1041,6 @@ static struct audit_buffer * 
audit_buffer_alloc(struct audit_context *ctx,
  {
  	unsigned long flags;
  	struct audit_buffer *ab = NULL;
-	struct nlmsghdr *nlh;

  	spin_lock_irqsave(&audit_freelist_lock, flags);
  	if (!list_empty(&audit_freelist)) {
@@ -1065,7 +1064,7 @@ static struct audit_buffer * 
audit_buffer_alloc(struct audit_context *ctx,
  	if (!ab->skb)
  		goto nlmsg_failure;

-	nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
+	NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);

  	return ab;

-- 
1.7.1.rc1.21.gf3bd6

Justin P. Mattock
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