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[PATCH] i386: cleanups to help using per-cpu variables from asm

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This patch does a few small cleanups:
 - use PER_CPU_NAME to generate the names of per-cpu variables
 - use lea to add the per_cpu offset in PER_CPU(), because it doesn't
   affect condition flags
 - add PER_CPU_VAR which allows direct access to pre-cpu variables
   with the %fs: prefix on SMP.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
This commit is contained in:
Jeremy Fitzhardinge
2007-05-02 19:27:16 +02:00
committed by Andi Kleen
parent 7c3576d261
commit 978c038ec9
1 changed files with 7 additions and 5 deletions
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12
include/asm-i386/percpu.h
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@@ -16,12 +16,14 @@
* PER_CPU(cpu_gdt_descr, %ebx) * PER_CPU(cpu_gdt_descr, %ebx)
*/ */
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#define PER_CPU(var, reg) \ #define PER_CPU(var, reg) \
movl %fs:per_cpu__this_cpu_off, reg; \ movl %fs:per_cpu__##this_cpu_off, reg; \
addl $per_cpu__##var, reg lea per_cpu__##var(reg), reg
#define PER_CPU_VAR(var) %fs:per_cpu__##var
#else /* ! SMP */ #else /* ! SMP */
#define PER_CPU(var, reg) \ #define PER_CPU(var, reg) \
movl $per_cpu__##var, reg; movl $per_cpu__##var, reg
#define PER_CPU_VAR(var) per_cpu__##var
#endif /* SMP */ #endif /* SMP */
#else /* ...!ASSEMBLY */ #else /* ...!ASSEMBLY */