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atomic(9): Remove fcmpset-based fallback for atomic_testand(clear|set)

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All architectures implement a MD version

Reviewed by:	kib
Sponsored by:	AFRL, DARPA
Differential Revision:	https://reviews.freebsd.org/D47629
This commit is contained in:
John Baldwin 2024-11-19 10:23:15 -05:00
parent 987c5a1944
commit fa2091d757
3 changed files with 0 additions and 74 deletions
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4
sys/arm/include/atomic.h
View file

@ -892,8 +892,6 @@ atomic_testandclear_long(volatile u_long *p, u_int v)
return (atomic_testandclear_32((volatile uint32_t *)p, v));
}
#define atomic_testandclear_long atomic_testandclear_long
static __inline int
atomic_testandclear_64(volatile uint64_t *p, u_int v)
@ -952,7 +950,6 @@ atomic_testandset_long(volatile u_long *p, u_int v)
return (atomic_testandset_32((volatile uint32_t *)p, v));
}
#define atomic_testandset_long atomic_testandset_long
static __inline int
atomic_testandset_acq_long(volatile u_long *p, u_int v)
@ -963,7 +960,6 @@ atomic_testandset_acq_long(volatile u_long *p, u_int v)
dmb();
return (ret);
}
#define atomic_testandset_acq_long atomic_testandset_acq_long
static __inline int
atomic_testandset_64(volatile uint64_t *p, u_int v)

6
sys/powerpc/include/atomic.h
View file

@ -1093,12 +1093,6 @@ atomic_testandset_acq_long(volatile u_long *p, u_int v)
return (a);
}
#define atomic_testandclear_int atomic_testandclear_int
#define atomic_testandset_int atomic_testandset_int
#define atomic_testandclear_long atomic_testandclear_long
#define atomic_testandset_long atomic_testandset_long
#define atomic_testandset_acq_long atomic_testandset_acq_long
static __inline void
atomic_thread_fence_acq(void)
{

64
sys/sys/_atomic_subword.h
View file

@ -205,68 +205,4 @@ atomic_load_acq_16(volatile uint16_t *p)
#undef _ATOMIC_BYTE_SHIFT
#undef _ATOMIC_HWORD_SHIFT
/*
* Provide generic testandset_long implementation based on fcmpset long
* primitive. It may not be ideal for any given arch, so machine/atomic.h
* should define the macro atomic_testandset_long to override with an
* MD-specific version.
*
* (Organizationally, this isn't really subword atomics. But atomic_common is
* included too early in machine/atomic.h, so it isn't a good place for derived
* primitives like this.)
*/
#ifndef atomic_testandset_acq_long
static __inline int
atomic_testandset_acq_long(volatile u_long *p, u_int v)
{
u_long bit, old;
bool ret;
bit = (1ul << (v % (sizeof(*p) * NBBY)));
old = atomic_load_acq_long(p);
ret = false;
while (!ret && (old & bit) == 0)
ret = atomic_fcmpset_acq_long(p, &old, old | bit);
return (!ret);
}
#endif
#ifndef atomic_testandset_long
static __inline int
atomic_testandset_long(volatile u_long *p, u_int v)
{
u_long bit, old;
bool ret;
bit = (1ul << (v % (sizeof(*p) * NBBY)));
old = atomic_load_long(p);
ret = false;
while (!ret && (old & bit) == 0)
ret = atomic_fcmpset_long(p, &old, old | bit);
return (!ret);
}
#endif
#ifndef atomic_testandclear_long
static __inline int
atomic_testandclear_long(volatile u_long *p, u_int v)
{
u_long bit, old;
bool ret;
bit = (1ul << (v % (sizeof(*p) * NBBY)));
old = atomic_load_long(p);
ret = false;
while (!ret && (old & bit) != 0)
ret = atomic_fcmpset_long(p, &old, old & ~bit);
return (ret);
}
#endif
#endif /* _SYS__ATOMIC_SUBWORD_H_ */