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authorJeremy Fitzhardinge <jeremy@goop.org>2007-05-02 19:27:16 +0200
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 19:27:16 +0200
commit978c038ec944e4f2c940b0975c6acb433203a9be (patch)
treef4bab9c040e5c4876fadeea765fed623f148ad69
parent7c3576d261ce046789a7db14f43303f8120910c7 (diff)
[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: 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>
-rw-r--r--include/asm-i386/percpu.h12
1 files changed, 7 insertions, 5 deletions
diff --git a/include/asm-i386/percpu.h b/include/asm-i386/percpu.h
index c5f12f0d9c2..cdcb63db30a 100644
--- a/include/asm-i386/percpu.h
+++ b/include/asm-i386/percpu.h
@@ -16,12 +16,14 @@
* PER_CPU(cpu_gdt_descr, %ebx)
*/
#ifdef CONFIG_SMP
-#define PER_CPU(var, reg) \
- movl %fs:per_cpu__this_cpu_off, reg; \
- addl $per_cpu__##var, reg
+#define 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;
+#define PER_CPU(var, reg) \
+ movl $per_cpu__##var, reg
+#define PER_CPU_VAR(var) per_cpu__##var
#endif /* SMP */
#else /* ...!ASSEMBLY */