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Commit 978c038e authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Andi Kleen
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[PATCH] i386: cleanups to help using per-cpu variables from asm 



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: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
parent 7c3576d2

include/asm-i386/percpu.h

+7 −5
Original line number Diff line number Diff line
@@ -17,11 +17,13 @@ 
 */

#ifdef CONFIG_SMP

#define PER_CPU(var, reg)				\

	movl %fs:per_cpu__this_cpu_off, reg;		\

	addl $per_cpu__##var, reg

	movl %fs:per_cpu__##this_cpu_off, reg;		\

	lea per_cpu__##var(reg), reg

#define PER_CPU_VAR(var)	%fs:per_cpu__##var

#else /* ! SMP */

#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 */



#else /* ...!ASSEMBLY */