This is a note to let you know that I've just added the patch titled parisc: Fix compiler warnings in debug_core.c to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: parisc-fix-compiler-warnings-in-debug_core.c.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 2e7398729798194be9dc651688c7c43594ee7bec Author: Helge Deller <deller@xxxxxx> Date: Fri Dec 20 21:00:19 2019 +0100 parisc: Fix compiler warnings in debug_core.c [ Upstream commit 75cf9797006a3a9f29a3a25c1febd6842a4a9eb2 ] Fix this compiler warning: kernel/debug/debug_core.c: In function â??kgdb_cpu_enterâ??: arch/parisc/include/asm/cmpxchg.h:48:3: warning: value computed is not used [-Wunused-value] 48 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) arch/parisc/include/asm/atomic.h:78:30: note: in expansion of macro â??xchgâ?? 78 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | ^~~~ kernel/debug/debug_core.c:596:4: note: in expansion of macro â??atomic_xchgâ?? 596 | atomic_xchg(&kgdb_active, cpu); | ^~~~~~~~~~~ Signed-off-by: Helge Deller <deller@xxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h index 0a90b965cccb..9849bef2a766 100644 --- a/arch/parisc/include/asm/cmpxchg.h +++ b/arch/parisc/include/asm/cmpxchg.h @@ -43,8 +43,14 @@ __xchg(unsigned long x, __volatile__ void *ptr, int size) ** if (((unsigned long)p & 0xf) == 0) ** return __ldcw(p); */ -#define xchg(ptr, x) \ - ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) +#define xchg(ptr, x) \ +({ \ + __typeof__(*(ptr)) __ret; \ + __typeof__(*(ptr)) _x_ = (x); \ + __ret = (__typeof__(*(ptr))) \ + __xchg((unsigned long)_x_, (ptr), sizeof(*(ptr))); \ + __ret; \ +}) /* bug catcher for when unsupported size is used - won't link */ extern void __cmpxchg_called_with_bad_pointer(void);