diff options
| author | Paul E. McKenney <[email protected]> | 2015-04-12 08:06:55 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2015-04-13 08:25:16 +0200 |
| commit | 00df35f991914db6b8bde8cf09808e19a9cffc3d (patch) | |
| tree | 626f0f8fd29b55f9a203565948dfd8bb70530496 /lib/memory-notifier-error-inject.c | |
| parent | 4bfe186dbe0a058680e4bfb0d673194f0ceaffd4 (diff) | |
cpu: Defer smpboot kthread unparking until CPU known to scheduler
Currently, smpboot_unpark_threads() is invoked before the incoming CPU
has been added to the scheduler's runqueue structures. This might
potentially cause the unparked kthread to run on the wrong CPU, since the
correct CPU isn't fully set up yet.
That causes a sporadic, hard to debug boot crash triggering on some
systems, reported by Borislav Petkov, and bisected down to:
2a442c9c6453 ("x86: Use common outgoing-CPU-notification code")
This patch places smpboot_unpark_threads() in a CPU hotplug
notifier with priority set so that these kthreads are unparked just after
the CPU has been added to the runqueues.
Reported-and-tested-by: Borislav Petkov <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'lib/memory-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions