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authorJan Kara <jack@suse.cz>2014-06-04 16:11:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:54:16 -0700
commitca1d432ad8a527fabc5c7ceed8526e3a28de121c (patch)
treeaeba2801756018b1b16267c55927746b2e19e283 /kernel
parent034633ccb24d675850f99bf85c1c5880c831e4b6 (diff)
downloadlinux-ca1d432ad8a527fabc5c7ceed8526e3a28de121c.tar.bz2
printk: remove outdated comment
Comment about interesting interlocking between lockbuf_lock and console_sem is outdated.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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/printk/printk.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 7476a53bc378..5bc54478c963 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -206,8 +206,7 @@ struct printk_log {
};
/*
- * The logbuf_lock protects kmsg buffer, indices, counters. It is also
- * used in interesting ways to provide interlocking in console_unlock();
+ * The logbuf_lock protects kmsg buffer, indices, counters.
*/
static DEFINE_RAW_SPINLOCK(logbuf_lock);