softlockup: serialized softlockup's log

If multiple CPUs trigger softlockup at the same time with
'softlockup_all_cpu_backtrace=0', the softlockup's logs will appear
staggeredly in dmesg, which will affect the viewing of the logs for
developer.  Since the code path for outputting softlockup logs is not a
kernel hotspot and the performance requirements for the code are not
strict, locks are used to serialize the softlockup log output to improve
the readability of the logs.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Li Zhe <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Cc: Lecopzer Chen <[email protected]>
Cc: Pingfan Liu <[email protected]>
Cc: Zefan Li <[email protected]>
Cc: John Ogness <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions