diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2020-06-30 22:22:54 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-09-04 20:52:50 +0200 |
| commit | 35feb60474bf4f7fa7840e14fc7fd344996b919d (patch) | |
| tree | 17030fd8b9c654eab6b9da001de1776ff95a2385 /lib/bug.c | |
| parent | smp: Add source and destination CPUs to __call_single_data (diff) | |
| download | linux-35feb60474bf4f7fa7840e14fc7fd344996b919d.tar.xz linux-35feb60474bf4f7fa7840e14fc7fd344996b919d.zip | |
kernel/smp: Provide CSD lock timeout diagnostics
This commit causes csd_lock_wait() to emit diagnostics when a CPU
fails to respond quickly enough to one of the smp_call_function()
family of function calls. These diagnostics are enabled by a new
CSD_LOCK_WAIT_DEBUG Kconfig option that depends on DEBUG_KERNEL.
This commit was inspired by an earlier patch by Josef Bacik.
[ paulmck: Fix for syzbot+0f719294463916a3fc0e@syzkaller.appspotmail.com ]
[ paulmck: Fix KASAN use-after-free issue reported by Qian Cai. ]
[ paulmck: Fix botched nr_cpu_ids comparison per Dan Carpenter. ]
[ paulmck: Apply Peter Zijlstra feedback. ]
Link: https://lore.kernel.org/lkml/00000000000042f21905a991ecea@google.com
Link: https://lore.kernel.org/lkml/0000000000002ef21705a9933cf3@google.com
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'lib/bug.c')
0 files changed, 0 insertions, 0 deletions