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[PATCH] trigger a syntax error if percpu macros are incorrectly used

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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>
This commit is contained in:
Jan Blunck 2006-09-25 23:30:53 -07:00 • committed by Linus Torvalds
parent 0a2966b48f
commit 632bbfeee4
4 changed files with 31 additions and 15 deletions
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10
include/linux/percpu.h
View file

@ -11,8 +11,14 @@
#define PERCPU_ENOUGH_ROOM 32768
#endif
/* Must be an lvalue. */
#define get_cpu_var(var) (*({ preempt_disable(); &__get_cpu_var(var); }))
/*
* Must be an lvalue. Since @var must be a simple identifier,
* we force a syntax error here if it isn't.
*/
#define get_cpu_var(var) (*({ \
extern int simple_indentifier_##var(void); \
preempt_disable(); \
&__get_cpu_var(var); }))
#define put_cpu_var(var) preempt_enable()
#ifdef CONFIG_SMP