linux-kernel - Re: [PATCH] xen/pvcalls: use WARN_ON(1) instead of _

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Date:   Wed, 16 Aug 2017 14:36:55 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/pvcalls: use WARN_ON(1) instead of __WARN()

On 07/21/2017 03:26 PM, Stefano Stabellini wrote:
> On Fri, 21 Jul 2017, Arnd Bergmann wrote:
>> __WARN() is an internal helper that is only available on
>> some architectures, but causes a build error e.g. on ARM64
>> in some configurations:
>>
>> drivers/xen/pvcalls-back.c: In function 'set_backend_state':
>> drivers/xen/pvcalls-back.c:1097:5: error: implicit declaration of function '__WARN' [-Werror=implicit-function-declaration]
>>
>> Unfortunately, there is no equivalent of BUG() that takes no
>> arguments, but WARN_ON(1) is commonly used in other drivers
>> and works on all configurations.
>>
>> Fixes: 7160378206b2 ("xen/pvcalls: xenbus state handling")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>
>

Applied to for-linus-4.14

-boris