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| author |   Thomas Gleixner <tglx@linutronix.de> | 2016-12-13 13:14:17 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-12-15 11:44:29 +0100 |
| commit | 6a369583178d0b89c2c3919c4456ee22fee0f249 (patch) | |
| tree | eaaebee6ac4102b724483d19a1c6f920c5406b67 /arch/x86/include/asm/tsc.h | |
| parent | x86/tsc: Validate cpumask pointer before accessing it (diff) | |
| download | linux-dev-6a369583178d0b89c2c3919c4456ee22fee0f249.tar.xz linux-dev-6a369583178d0b89c2c3919c4456ee22fee0f249.zip | |
x86/tsc: Validate TSC_ADJUST after resume
Some 'feature' BIOSes fiddle with the TSC_ADJUST register during
suspend/resume which renders the TSC unusable.
Add sanity checks into the resume path and restore the
original value if it was adjusted.
Reported-and-tested-by: Roland Scheidegger <rscheidegger_lists@hispeed.ch>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Bruce Schlobohm <bruce.schlobohm@intel.com>
Cc: Kevin Stanton <kevin.b.stanton@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Allen Hung <allen_hung@dell.com>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/20161213131211.317654500@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm/tsc.h')
| -rw-r--r-- | arch/x86/include/asm/tsc.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h index c054eaa7dc94..372ad0cd1357 100644 --- a/arch/x86/include/asm/tsc.h +++ b/arch/x86/include/asm/tsc.h @@ -47,12 +47,12 @@ extern int tsc_clocksource_reliable; */ #ifdef CONFIG_X86_TSC extern bool tsc_store_and_check_tsc_adjust(void); -extern void tsc_verify_tsc_adjust(void); +extern void tsc_verify_tsc_adjust(bool resume); extern void check_tsc_sync_source(int cpu); extern void check_tsc_sync_target(void); #else static inline bool tsc_store_and_check_tsc_adjust(void) { return false; } -static inline void tsc_verify_tsc_adjust(void) { } +static inline void tsc_verify_tsc_adjust(bool resume) { } static inline void check_tsc_sync_source(int cpu) { } static inline void check_tsc_sync_target(void) { } #endif |