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

[Stephen Rothwell]

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").

-- 
Cheers,
Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx

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