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[PATCH] PM: Add pm_trace switch

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Add the pm_trace attribute in /sys/power which has to be explicitly set to
one to really enable the "PM tracing" code compiled in when CONFIG_PM_TRACE
is set (which modifies the machine's CMOS clock in unpredictable ways).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki
2006-09-25 23:32:58 -07:00
committed by Linus Torvalds
parent 7d145aa3ab
commit c5c6ba4e08
3 changed files with 59 additions and 10 deletions
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24
include/linux/resume-trace.h
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@@ -3,21 +3,25 @@
#ifdef CONFIG_PM_TRACE
extern int pm_trace_enabled;
struct device;
extern void set_trace_device(struct device *);
extern void generate_resume_trace(void *tracedata, unsigned int user);
#define TRACE_DEVICE(dev) set_trace_device(dev)
#define TRACE_RESUME(user) do { \
void *tracedata; \
asm volatile("movl $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n" \
"\t.long %c2\n" \
".previous" \
:"=r" (tracedata) \
: "i" (__LINE__), "i" (__FILE__)); \
generate_resume_trace(tracedata, user); \
#define TRACE_RESUME(user) do { \
if (pm_trace_enabled) { \
void *tracedata; \
asm volatile("movl $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n" \
"\t.long %c2\n" \
".previous" \
:"=r" (tracedata) \
: "i" (__LINE__), "i" (__FILE__)); \
generate_resume_trace(tracedata, user); \
} \
} while (0)
#else