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authorJan Blunck <jblunck@suse.de>2006-09-26 10:30:53 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 19:48:44 +0400
commit632bbfeee4f042c05bc65150b4433a297d3fe387 (patch)
treece67b5fa4bec38610fc0ecb9b20be6aa69763bb3 /include/asm-generic
parent0a2966b48fb784e437520e400ddc94874ddbd4e8 (diff)
downloadlinux-632bbfeee4f042c05bc65150b4433a297d3fe387.tar.xz
[PATCH] trigger a syntax error if percpu macros are incorrectly used
get_cpu_var()/per_cpu()/__get_cpu_var() arguments must be simple identifiers. Otherwise the arch dependent implementations might break. This patch enforces the correct usage of the macros by producing a syntax error if the variable is not a simple identifier. Signed-off-by: Jan Blunck <jblunck@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/percpu.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index e160e04290fb..6d45ee5472af 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -14,7 +14,9 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
/* var is in discarded region: offset to particular copy we want */
-#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
+#define per_cpu(var, cpu) (*({ \
+ extern int simple_indentifier_##var(void); \
+ RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())