ARM: 7868/1: arm/arm64: remove atomic_clear_mask() in "include/asm/atomic.h"

In current kernel wide source code, except other architectures, only
s390 scsi drivers use atomic_clear_mask(), and arm/arm64 need not
support s390 drivers.

So remove atomic_clear_mask() from "arm[64]/include/asm/atomic.h".
Signed-off-by: NChen Gang <gang.chen@asianux.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/atomic.h

@@ -135,21 +135,6 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
 	return oldval;
 }
 
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
-{
-	unsigned long tmp, tmp2;
-
-	__asm__ __volatile__("@ atomic_clear_mask\n"
-"1:	ldrex	%0, [%3]\n"
-"	bic	%0, %0, %4\n"
-"	strex	%1, %0, [%3]\n"
-"	teq	%1, #0\n"
-"	bne	1b"
-	: "=&r" (tmp), "=&r" (tmp2), "+Qo" (*addr)
-	: "r" (addr), "Ir" (mask)
-	: "cc");
-}
-
 #else /* ARM_ARCH_6 */
 
 #ifdef CONFIG_SMP
@@ -198,15 +183,6 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
 	return ret;
 }
 
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
-{
-	unsigned long flags;
-
-	raw_local_irq_save(flags);
-	*addr &= ~mask;
-	raw_local_irq_restore(flags);
-}
-
 #endif /* __LINUX_ARM_ARCH__ */
 
 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))

arch/arm64/include/asm/atomic.h

@@ -126,20 +126,6 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
 	return oldval;
 }
 
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
-{
-	unsigned long tmp, tmp2;
-
-	asm volatile("// atomic_clear_mask\n"
-"1:	ldxr	%0, %2\n"
-"	bic	%0, %0, %3\n"
-"	stxr	%w1, %0, %2\n"
-"	cbnz	%w1, 1b"
-	: "=&r" (tmp), "=&r" (tmp2), "+Q" (*addr)
-	: "Ir" (mask)
-	: "cc");
-}
-
 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 static inline int __atomic_add_unless(atomic_t *v, int a, int u)