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markers: add an if(0) to __mark_check_format()

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Wrap __mark_check_format() into an if(0) to make sure that parameters such as

trace_mark(mm_page_alloc, "order %u pfn %lu", order, page?page_to_pfn(page):0);

(where page_to_pfn() has side-effects) won't generate code because of the
__mark_check_format().

Thanks to Jan Kiszka for reporting this.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2008-03-04 14:29:00 -08:00 committed by Linus Torvalds
parent 544adb4107
commit acc4988bcf
1 changed files with 7 additions and 1 deletions
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8
include/linux/marker.h
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@ -104,10 +104,16 @@ static inline void marker_update_probe_range(struct marker *begin,
#define MARK_NOARGS " "
/* To be used for string format validity checking with gcc */
static inline void __printf(1, 2) __mark_check_format(const char *fmt, ...)
static inline void __printf(1, 2) ___mark_check_format(const char *fmt, ...)
{
}
#define __mark_check_format(format, args...) \
do { \
if (0) \
___mark_check_format(format, ## args); \
} while (0)
extern marker_probe_func __mark_empty_function;
extern void marker_probe_cb(const struct marker *mdata,