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[PATCH] x86: Log reason why TSC was marked unstable

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Change mark_tsc_unstable() so it takes a string argument, which holds the
reason the TSC was marked unstable.

This is then displayed the first time mark_tsc_unstable is called.

This should help us better debug why the TSC was marked unstable on certain
systems and allow us to make sure we're not being overly paranoid when
throwing out this troublesome clocksource.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
john stultz
2007-05-02 19:27:08 +02:00
committed by Andi Kleen
parent 2714221985
commit 5a90cf205c
9 changed files with 15 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/asm-i386/mach-summit/mach_mpparse.h
View File

@@ -30,7 +30,7 @@ static inline int mps_oem_check(struct mp_config_table *mpc, char *oem,
(!strncmp(productid, "VIGIL SMP", 9)
|| !strncmp(productid, "EXA", 3)
|| !strncmp(productid, "RUTHLESS SMP", 12))){
mark_tsc_unstable();
mark_tsc_unstable("Summit based system");
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;
@@ -44,7 +44,7 @@ static inline int acpi_madt_oem_check(char *oem_id, char *oem_table_id)
if (!strncmp(oem_id, "IBM", 3) &&
(!strncmp(oem_table_id, "SERVIGIL", 8)
|| !strncmp(oem_table_id, "EXA", 3))){
mark_tsc_unstable();
mark_tsc_unstable("Summit based system");
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;

2
include/asm-i386/tsc.h
View File

@@ -53,7 +53,7 @@ static __always_inline cycles_t get_cycles_sync(void)
}
extern void tsc_init(void);
extern void mark_tsc_unstable(void);
extern void mark_tsc_unstable(char *reason);
extern int unsynchronized_tsc(void);
extern void init_tsc_clocksource(void);

2
include/asm-x86_64/timex.h
View File

@@ -27,6 +27,6 @@ extern int read_current_timer(unsigned long *timer_value);
#define NS_SCALE 10 /* 2^10, carefully chosen */
#define US_SCALE 32 /* 2^32, arbitralrily chosen */
extern void mark_tsc_unstable(void);
extern void mark_tsc_unstable(char *msg);
extern void set_cyc2ns_scale(unsigned long khz);
#endif