From: Helge Deller Date: Sat, 2 Mar 2013 19:01:05 +0000 (+0100) Subject: parisc: fix compile warnings triggered by atomic_sub(sizeof(),v) X-Git-Tag: firefly_0821_release~3680^2~959^2~2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8527ed4a7086e7312b8d021ea36d367f7e378c2e;p=firefly-linux-kernel-4.4.55.git parisc: fix compile warnings triggered by atomic_sub(sizeof(),v) This fixes compile warnings like this one: net/ipv4/igmp.c: In function ‘ip_mc_leave_group’: net/ipv4/igmp.c:1898:3: warning: overflow in implicit constant conversion [-Woverflow] atomic_sub() is defined as __atomic_add_return(-(VAL),(v)))) and if VAL is of type unsigned int (as returned by sizeof()), negating this value will overflow. Fix this by type-casting VAL to int type. Signed-off-by: Helge Deller --- diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h index af9cf30ed474..f38e1984b242 100644 --- a/arch/parisc/include/asm/atomic.h +++ b/arch/parisc/include/asm/atomic.h @@ -115,8 +115,8 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) } -#define atomic_add(i,v) ((void)(__atomic_add_return( (i),(v)))) -#define atomic_sub(i,v) ((void)(__atomic_add_return(-(i),(v)))) +#define atomic_add(i,v) ((void)(__atomic_add_return( (i),(v)))) +#define atomic_sub(i,v) ((void)(__atomic_add_return(-((int) (i)),(v)))) #define atomic_inc(v) ((void)(__atomic_add_return( 1,(v)))) #define atomic_dec(v) ((void)(__atomic_add_return( -1,(v))))