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

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Date:	Sat, 19 Jun 2010 06:29:07 -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

On 06/19/2010 01:06 AM, Geert Uytterhoeven wrote:
> On Sat, Jun 19, 2010 at 06:45, Justin P. Mattock
> <justinmattock@...il.com>  wrote:
>>> 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
>
> nlmsg_new() allocates a new nlmsg.
> NLMSG_NEW() initializes a nlmsg inside an already allocated skbuff.
>

o.k.. now I see what those two are doing a bit better now nlmsg_new
is the start of a netlink messg, and NLMSG_NEW is a new netlink messg 
thats already been started.

>> 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.
>
> Looks OK to me, thanks!
>

I'll resend it out with the proper subject, and proper intro to it.

>>  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
>
> Gr{oetje,eeting}s,
>
> 						Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> 							    -- Linus Torvalds
>

thanks for taking the time to look at this.

Justin P. Mattock
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