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locking/arch: Wire up local_try_cmpxchg()

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Implement target specific support for local_try_cmpxchg()
and local_cmpxchg() using typed C wrappers that call their
_local counterpart and provide additional checking of
their input arguments.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230405141710.3551-4-ubizjak@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Uros Bizjak 2023-04-05 16:17:08 +02:00 committed by Ingo Molnar
parent 8fc4fddaf9
commit d994f2c8e2
5 changed files with 54 additions and 8 deletions
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12
arch/alpha/include/asm/local.h
View File

@ -52,8 +52,16 @@ static __inline__ long local_sub_return(long i, local_t * l)
return result;
}
#define local_cmpxchg(l, o, n) \
(cmpxchg_local(&((l)->a.counter), (o), (n)))
static __inline__ long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
{
return try_cmpxchg_local(&l->a.counter, (s64 *)old, new);
}
#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
/**

13
arch/loongarch/include/asm/local.h
View File

@ -56,8 +56,17 @@ static inline long local_sub_return(long i, local_t *l)
return result;
}
#define local_cmpxchg(l, o, n) \
((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
static inline long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
return try_cmpxchg_local(&l->a.counter, __old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
/**

13
arch/mips/include/asm/local.h
View File

@ -94,8 +94,17 @@ static __inline__ long local_sub_return(long i, local_t * l)
return result;
}
#define local_cmpxchg(l, o, n) \
((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
static __inline__ long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
{
typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
return try_cmpxchg_local(&l->a.counter, __old, new);
}
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
/**

11
arch/powerpc/include/asm/local.h
View File

@ -90,6 +90,17 @@ static __inline__ long local_cmpxchg(local_t *l, long o, long n)
return t;
}
static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n)
{
long o = *po, r;
r = local_cmpxchg(l, o, n);
if (unlikely(r != o))
*po = r;
return likely(r == o);
}
static __inline__ long local_xchg(local_t *l, long n)
{
long t;

13
arch/x86/include/asm/local.h
View File

@ -120,8 +120,17 @@ static inline long local_sub_return(long i, local_t *l)
#define local_inc_return(l) (local_add_return(1, l))
#define local_dec_return(l) (local_sub_return(1, l))
#define local_cmpxchg(l, o, n) \
(cmpxchg_local(&((l)->a.counter), (o), (n)))
static inline long local_cmpxchg(local_t *l, long old, long new)
{
return cmpxchg_local(&l->a.counter, old, new);
}
static inline bool local_try_cmpxchg(local_t *l, long *old, long new)
{
typeof(l->a.counter) *__old = (typeof(l->a.counter) *) old;
return try_cmpxchg_local(&l->a.counter, __old, new);
}
/* Always has a lock prefix */
#define local_xchg(l, n) (xchg(&((l)->a.counter), (n)))