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parisc: Fix compiler warnings in debug_core.c

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[ Upstream commit 75cf9797006a3a9f29a3a25c1febd6842a4a9eb2 ]

Fix this compiler warning:
kernel/debug/debug_core.c: In function ‘kgdb_cpu_enter’:
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 ‘xchg’
   78 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
      |                              ^~~~
kernel/debug/debug_core.c:596:4: note: in expansion of macro ‘atomic_xchg’
  596 |    atomic_xchg(&kgdb_active, cpu);
      |    ^~~~~~~~~~~

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Helge Deller 2019-12-20 21:00:19 +01:00 committed by Greg Kroah-Hartman
parent e80e36de03
commit 4b9f0187aa
1 changed files with 8 additions and 2 deletions
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10
arch/parisc/include/asm/cmpxchg.h
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@ -44,8 +44,14 @@ __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);