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Subject: Re: svn commit: r329371 - head/sys/compat/linuxkpi/common/include/asm
To: Jan Beich <jbeich@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
References: <201802161520.w1GFKLiA049085@repo.freebsd.org>
 <mv08-30rc-wny@FreeBSD.org>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <6f790c90-8c65-ab0b-4a58-2814be55f09f@selasky.org>
Date: Sat, 17 Feb 2018 08:32:34 +0100
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On 02/17/18 01:42, Jan Beich wrote:
> Hans Petter Selasky <hselasky@FreeBSD.org> writes:
> 
>> Author: hselasky
>> Date: Fri Feb 16 15:20:21 2018
>> New Revision: 329371
>> URL: https://svnweb.freebsd.org/changeset/base/329371
>>
>> Log:
>>    Allow the cmpxchg() macro in the LinuxKPI to work on pointers without
>>    generating compiler warnings, -Wint-conversion .
> [...]
> 
> To generate errors instead ?
> 
> $ make clean all -C /usr/ports/graphics/drm-next-kmod
> [...]
> drm_lock.c:72:10: error: flexible array member 'u8' in a union is not allowed
>                  prev = cmpxchg(lock, old, new);
>                         ^

I believe this is a regression issue in GCC:

https://gcc.gnu.org/ml/gcc-patches/2016-07/msg01505.html

--HPS