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x86/percpu: Move raw_percpu_xchg_op() to a better place

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Move raw_percpu_xchg_op() together with this_percpu_xchg_op()
and trivially rename some internal variables to harmonize them
between macro implementations.

No functional changes intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240320083127.493250-2-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak
2024-03-20 09:30:41 +01:00
committed by Ingo Molnar
parent 0539084639
commit ce99b9c8da
1 changed files with 11 additions and 12 deletions
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23
arch/x86/include/asm/percpu.h
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@@ -229,6 +229,17 @@ do { \
(typeof(_var))(unsigned long) (paro_tmp__ + _val); \
})
/*
* raw_cpu_xchg() can use a load-store since
* it is not required to be IRQ-safe.
*/
#define raw_percpu_xchg_op(_var, _nval) \
({ \
typeof(_var) pxo_old__ = raw_cpu_read(_var); \
raw_cpu_write(_var, _nval); \
pxo_old__; \
})
/*
* this_cpu_xchg() is implemented using cmpxchg without a lock prefix.
* xchg is expensive due to the implied lock prefix. The processor
@@ -499,18 +510,6 @@ do { \
#define raw_cpu_or_1(pcp, val) percpu_to_op(1, , "or", (pcp), val)
#define raw_cpu_or_2(pcp, val) percpu_to_op(2, , "or", (pcp), val)
#define raw_cpu_or_4(pcp, val) percpu_to_op(4, , "or", (pcp), val)
/*
* raw_cpu_xchg() can use a load-store since it is not required to be
* IRQ-safe.
*/
#define raw_percpu_xchg_op(var, nval) \
({ \
typeof(var) pxo_ret__ = raw_cpu_read(var); \
raw_cpu_write(var, (nval)); \
pxo_ret__; \
})
#define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val)
#define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val)