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x86/percpu: Introduce raw_cpu_read_long() to reduce ifdeffery

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Introduce raw_cpu_read_long() macro to slightly reduce ifdeffery
in <asm/percpu.h>.

No functional changes intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240404094218.448963-3-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak 2024-04-04 11:42:03 +02:00 committed by Ingo Molnar
parent a3f8a3a2cf
commit 93cfa544cf
1 changed files with 6 additions and 8 deletions
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14
arch/x86/include/asm/percpu.h
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@ -59,12 +59,6 @@
#define __force_percpu_prefix "%%"__stringify(__percpu_seg)":"
#define __my_cpu_offset this_cpu_read(this_cpu_off)
#ifdef CONFIG_X86_64
#define __raw_my_cpu_offset raw_cpu_read_8(this_cpu_off);
#else
#define __raw_my_cpu_offset raw_cpu_read_4(this_cpu_off);
#endif
/*
* Compared to the generic __my_cpu_offset version, the following
* saves one instruction and avoids clobbering a temp register.
@ -76,7 +70,7 @@
#ifndef BUILD_VDSO32_64
#define arch_raw_cpu_ptr(_ptr) \
({ \
unsigned long tcp_ptr__ = __raw_my_cpu_offset; \
unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \
tcp_ptr__ += (__force unsigned long)(_ptr); \
(typeof(*(_ptr)) __kernel __force *)tcp_ptr__; \
})
@ -563,9 +557,13 @@ do { \
#define this_cpu_xchg_8(pcp, nval) this_percpu_xchg_op(pcp, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval)
#define this_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval)
#define raw_cpu_read_long(pcp) raw_cpu_read_8(pcp)
#else
/* There is no generic 64 bit read stable operation for 32 bit targets. */
#define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
#define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
#define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp)
#endif
#define x86_this_cpu_constant_test_bit(_nr, _var) \