printk: remove outdated comment
authorJan Kara <jack@suse.cz>
Wed, 4 Jun 2014 23:11:34 +0000 (16:11 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 4 Jun 2014 23:54:16 +0000 (16:54 -0700)
commitca1d432ad8a527fabc5c7ceed8526e3a28de121c
treeaeba2801756018b1b16267c55927746b2e19e283
parent034633ccb24d675850f99bf85c1c5880c831e4b6
printk: remove outdated comment

Comment about interesting interlocking between lockbuf_lock and
console_sem is outdated.

It was added in 2002 by commit a880f45a48be during conversion of
console_lock to console_sem + lockbuf_lock.

At that time release_console_sem() (today's equivalent is
console_unlock()) was indeed using lockbuf_lock to avoid races between
trylock on console_sem in printk() and unlock of console_sem.  However
these days the interlocking is gone and the races are avoided by
rechecking logbuf state after releasing console_sem.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/printk/printk.c