[RESEND] x86: Refactor __cmpxchg to cmpxchg in lock_cmos

[Philipp K]

It is unusual to reference __cmpxchg() from other files than cmpxchg.h and
similar.
Instead, cmpxchg() is used, which expands to __cmpxchg() and derives the
'size' parameter automatically with sizeof(*(ptr)).

So clean up the lock_cmos() function by using cmpxchg(), without changing
the generated code.

Signed-off-by: Philipp Klocke <philipp97kl@xxxxxxxxx>
---

This patch was acked by Ingo, so I would expect it to be added to pit.

 arch/x86/include/asm/mc146818rtc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/mc146818rtc.h
b/arch/x86/include/asm/mc146818rtc.h
index 97198001e567..b72e3bbba0a2 100644
--- a/arch/x86/include/asm/mc146818rtc.h
+++ b/arch/x86/include/asm/mc146818rtc.h
@@ -47,7 +47,7 @@ static inline void lock_cmos(unsigned char reg)
  cpu_relax();
  continue;
  }
- if (__cmpxchg(&cmos_lock, 0, new, sizeof(cmos_lock)) == 0)
+ if (cmpxchg(&cmos_lock, 0, new) == 0)
  return;
  }
 }
-- 
2.19.1