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x86/percpu: Introduce the __raw_cpu_read_const() macro

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Introduce the __raw_cpu_read_const() macro to further reduce ifdeffery
and differences between configs w/ and w/o USE_X86_SEG_SUPPORT.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240430091833.196482-4-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak
2024-04-30 11:17:23 +02:00
committed by Ingo Molnar
parent a50ea64129
commit 539615de70
1 changed files with 9 additions and 10 deletions
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19
arch/x86/include/asm/percpu.h
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@@ -156,6 +156,8 @@ do { \
*(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \
} while (0)
#define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp)
#else /* CONFIG_USE_X86_SEG_SUPPORT */
#define __raw_cpu_read(size, qual, _var) \
@@ -180,6 +182,12 @@ do { \
: [val] __pcpu_reg_imm_##size(pto_val__)); \
} while (0)
/*
* The generic per-cpu infrastrucutre is not suitable for
* reading const-qualified variables.
*/
#define __raw_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
#endif /* CONFIG_USE_X86_SEG_SUPPORT */
#define percpu_stable_op(size, op, _var) \
@@ -470,16 +478,7 @@ do { \
#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)
#endif
#ifdef CONFIG_USE_X86_SEG_SUPPORT
#define this_cpu_read_const(pcp) __raw_cpu_read(, , pcp)
#else /* CONFIG_USE_X86_SEG_SUPPORT */
/*
* The generic per-cpu infrastrucutre is not suitable for
* reading const-qualified variables.
*/
#define this_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
#endif /* CONFIG_USE_X86_SEG_SUPPORT */
#define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp)
#define this_cpu_read_stable_1(pcp) percpu_stable_op(1, "mov", pcp)
#define this_cpu_read_stable_2(pcp) percpu_stable_op(2, "mov", pcp)