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arch,mips: Convert smp_mb__*()

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MIPS is interesting and has hardware variants that reorder over ll/sc
as well as those that do not.

Implement the 2 new barrier functions as per the old barriers.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-9ph49jbae3hol9v721sbc2g6@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maciej W. Rozycki" <macro@codesourcery.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2014-03-13 19:00:36 +01:00 • committed by Ingo Molnar
commit 91bbefe6b0
4 changed files with 7 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

9
arch/mips/include/asm/atomic.h
View file

@ -761,13 +761,4 @@ static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
#endif /* CONFIG_64BIT */
/*
* atomic*_return operations are serializing but not the non-*_return
* versions.
*/
#define smp_mb__before_atomic_dec() smp_mb__before_llsc()
#define smp_mb__after_atomic_dec() smp_llsc_mb()
#define smp_mb__before_atomic_inc() smp_mb__before_llsc()
#define smp_mb__after_atomic_inc() smp_llsc_mb()
#endif /* _ASM_ATOMIC_H */

3
arch/mips/include/asm/barrier.h
View file

@ -195,4 +195,7 @@ do { \
___p1; \
})
#define smp_mb__before_atomic() smp_mb__before_llsc()
#define smp_mb__after_atomic() smp_llsc_mb()
#endif /* __ASM_BARRIER_H */

11
arch/mips/include/asm/bitops.h
View file

@ -37,13 +37,6 @@
#define __EXT "dext "
#endif
/*
* clear_bit() doesn't provide any barrier for the compiler.
*/
#define smp_mb__before_clear_bit() smp_mb__before_llsc()
#define smp_mb__after_clear_bit() smp_llsc_mb()
/*
* These are the "slower" versions of the functions and are in bitops.c.
* These functions call raw_local_irq_{save,restore}().
@ -120,7 +113,7 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
*
* clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
* you should call smp_mb__before_atomic() and/or smp_mb__after_atomic()
* in order to ensure changes are visible on other processors.
*/
static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
@ -175,7 +168,7 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
*/
static inline void clear_bit_unlock(unsigned long nr, volatile unsigned long *addr)
{
smp_mb__before_clear_bit();
smp_mb__before_atomic();
clear_bit(nr, addr);
}

4
arch/mips/kernel/irq.c
View file

@ -62,9 +62,9 @@ void __init alloc_legacy_irqno(void)
void free_irqno(unsigned int irq)
{
smp_mb__before_clear_bit();
smp_mb__before_atomic();
clear_bit(irq, irq_map);
smp_mb__after_clear_bit();
smp_mb__after_atomic();
}
/*