From b1f1c11c3aa86238082c1b1836efadae2738c909 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 22 May 2014 10:43:34 +1000 Subject: [PATCH] printk: remove outdated comment Comment about interesting interlocking between lockbuf_lock and console_sem is outdated. It was added in 2002 by commit a880f45a48be2956d2c78a839c472287d54435c1 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 Signed-off-by: Andrew Morton --- kernel/printk/printk.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 637e8ebb3a96..3ae9d512d28b 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); -- 2.39.5