Re: linux-next: build warnings after merge of the net-next tree

[Willem de Bruijn]

On Thu, May 14, 2015 at 3:12 AM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
> Hi all,
>
> After merging the net-next tree, today's linux-next build (sparc64 defconfig)
> produced these warnings:
>
> In file included from arch/sparc/include/asm/cmpxchg.h:4:0,
>                  from arch/sparc/include/asm/atomic_64.h:11,
>                  from arch/sparc/include/asm/atomic.h:4,
>                  from include/linux/atomic.h:4,
>                  from include/linux/spinlock.h:416,
>                  from include/linux/mmzone.h:7,
>                  from include/linux/gfp.h:5,
>                  from include/linux/mm.h:9,
>                  from net/packet/af_packet.c:56:
> net/packet/af_packet.c: In function 'packet_rcv_has_room':
> arch/sparc/include/asm/cmpxchg_64.h:43:22: warning: value computed is not used [-Wunused-value]
>  #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
>                       ^
> net/packet/af_packet.c:1314:3: note: in expansion of macro 'xchg'
>    xchg(&po->pressure, !has_room);
>    ^
> net/packet/af_packet.c: In function 'packet_poll':
> arch/sparc/include/asm/cmpxchg_64.h:43:22: warning: value computed is not used [-Wunused-value]
>  #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
>                       ^
> net/packet/af_packet.c:3817:3: note: in expansion of macro 'xchg'
>    xchg(&po->pressure, 0);
>    ^
>
> Introduced by commit 2ccdbaa6d55b ("packet: rollover lock contention
> avoidance").

I just sent http://patchwork.ozlabs.org/patch/472362/ to resolve
these. Thanks for the report.
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