netdev - Re: [PATCH] net: xen-netback: include linux/vmalloc.h again

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Date:	Wed, 11 Jun 2014 15:19:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	wei.liu2@...rix.com
Cc:	arnd@...db.de, netdev@...r.kernel.org,
	andrew.bennieston@...rix.com, xen-devel@...ts.xenproject.org,
	jwboyer@...oraproject.org
Subject: Re: [PATCH] net: xen-netback: include linux/vmalloc.h again

From: Wei Liu <wei.liu2@...rix.com>
Date: Tue, 10 Jun 2014 09:44:54 +0100

> On Tue, Jun 10, 2014 at 10:34:36AM +0200, Arnd Bergmann wrote:
>> commit e9ce7cb6b107 ("xen-netback: Factor queue-specific data into
>> queue struct") added a use of vzalloc/vfree to interface.c, but
>> removed the #include <linux/vmalloc.h> statement at the same time,
>> which causes this build error:
>> 
>> drivers/net/xen-netback/interface.c: In function 'xenvif_free':
>> drivers/net/xen-netback/interface.c:754:2: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration]
>>   vfree(vif->queues);
>>   ^
>> cc1: some warnings being treated as errors
>> 
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> Cc: Wei Liu <wei.liu2@...rix.com>
>> Cc: Andrew J. Bennieston <andrew.bennieston@...rix.com>
> 
> Acked-by: Wei Liu <wei.liu2@...rix.com>
> 
> This didn't happen to me when I built it on x86 though. Just curious,
> did you build it on othet platform, say, ARM?

ARM and PowerPC will both show this problem.

The issue is that x86 get's linux/vmalloc.h implicitly through one of
it's asm/ headers, thus you'll never hit the issue if you only build
test on that arch.
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