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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/power | |
| parent | 31f8a651fc5784a9e6f482be5ef0dd111a535e88 (diff) | |
| download | linux-0-day-6a369583178d0b89c2c3919c4456ee22fee0f249.tar.gz linux-0-day-6a369583178d0b89c2c3919c4456ee22fee0f249.tar.xz | |
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/power')
| -rw-r--r-- | arch/x86/power/cpu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index 53cace2ec0e28..66ade16c76936 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -252,6 +252,7 @@ static void notrace __restore_processor_state(struct saved_context *ctxt) fix_processor_context(); do_fpu_end(); + tsc_verify_tsc_adjust(true); x86_platform.restore_sched_clock_state(); mtrr_bp_restore(); perf_restore_debug_store(); |