korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-28 14:44:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

gcc-4.6: printk: use stable variable to dump kmsg buffer

Browse Source 
kmsg_dump takes care to sample the global variables
inside a spinlock, but then goes on to use the same
variables outside the spinlock region too.

Use the correct variable. This will make the race
window smaller.

Found by gcc 4.6's new warnings.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2010-08-09 17:20:36 -07:00 committed by Linus Torvalds
parent 547415d5ed
commit 8c4af38e9b
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
kernel/printk.c
View File

@ -1549,9 +1549,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
chars = logged_chars;
spin_unlock_irqrestore(&logbuf_lock, flags);
if (logged_chars > end) {
s1 = log_buf + log_buf_len - logged_chars + end;
l1 = logged_chars - end;
if (chars > end) {
s1 = log_buf + log_buf_len - chars + end;
l1 = chars - end;
s2 = log_buf;
l2 = end;
@ -1559,8 +1559,8 @@ void kmsg_dump(enum kmsg_dump_reason reason)
s1 = "";
l1 = 0;
s2 = log_buf + end - logged_chars;
l2 = logged_chars;
s2 = log_buf + end - chars;
l2 = chars;
}
if (!spin_trylock_irqsave(&dump_list_lock, flags)) {