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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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20
include/asm-s390/percpu.h
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@@ -15,18 +15,20 @@
*/
#if defined(__s390x__) && defined(MODULE)
#define __reloc_hide(var,offset) \
(*({ unsigned long *__ptr; \
asm ( "larl %0,per_cpu__"#var"@GOTENT" \
: "=a" (__ptr) : "X" (per_cpu__##var) ); \
(typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
#define __reloc_hide(var,offset) (*({ \
extern int simple_indentifier_##var(void); \
unsigned long *__ptr; \
asm ( "larl %0,per_cpu__"#var"@GOTENT" \
: "=a" (__ptr) : "X" (per_cpu__##var) ); \
(typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
#else
#define __reloc_hide(var, offset) \
(*({ unsigned long __ptr; \
asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
(typeof(&per_cpu__##var)) (__ptr + (offset)); }))
#define __reloc_hide(var, offset) (*({ \
extern int simple_indentifier_##var(void); \
unsigned long __ptr; \
asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
(typeof(&per_cpu__##var)) (__ptr + (offset)); }))
#endif