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authorPeter Zijlstra <peterz@infradead.org>2017-04-21 12:52:52 +0200
committerIngo Molnar <mingo@kernel.org>2017-05-15 10:15:21 +0200
commit7708d5f04de4dd5d2110df3244372b1e3f61bc7c (patch)
tree12a45176fa7fbf1fb57fef0b99a764b4b73eee4f /lib/nlattr.c
parent2e44b7ddf8ab01cf98106c68388f87af15fbde73 (diff)
sched/clock: Print a warning recommending 'tsc=unstable'
With our switch to stable delayed until late_initcall(), the most likely cause of hitting mark_tsc_unstable() is the watchdog. The watchdog typically only triggers when creative BIOS'es fiddle with the TSC to hide SMI latency. Since the watchdog can only detect TSC fiddling after the fact all TSC clocks (including userspace GTOD) can already have reported funny values. The only way to fully avoid this, is manually marking the TSC unstable at boot. Suggest people do this on their broken systems. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/nlattr.c')
0 files changed, 0 insertions, 0 deletions