This is a note to let you know that I've just added the patch titled
fix jiffy calculations in calibrate_delay_direct to handle overflow
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
fix-jiffy-calculations-in-calibrate_delay_direct-to-handle-overflow.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From 70a062286b9dfcbd24d2e11601aecfead5cf709a Mon Sep 17 00:00:00 2001
From: Tim Deegan <[email protected]>
Date: Thu, 10 Feb 2011 08:50:41 +0000
Subject: fix jiffy calculations in calibrate_delay_direct to handle overflow
From: Tim Deegan <[email protected]>
commit 70a062286b9dfcbd24d2e11601aecfead5cf709a upstream.
Fixes a hang when booting as dom0 under Xen, when jiffies can be
quite large by the time the kernel init gets this far.
Signed-off-by: Tim Deegan <[email protected]>
[[email protected]: !time_after() -> time_before_eq() as suggested by Jiri
Slaby]
Signed-off-by: Jan Beulich <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
init/calibrate.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -66,7 +66,7 @@ static unsigned long __cpuinit calibrate
pre_start = 0;
read_current_timer(&start);
start_jiffies = jiffies;
- while (jiffies <= (start_jiffies + 1)) {
+ while (time_before_eq(jiffies, start_jiffies + 1)) {
pre_start = start;
read_current_timer(&start);
}
@@ -74,8 +74,8 @@ static unsigned long __cpuinit calibrate
pre_end = 0;
end = post_start;
- while (jiffies <=
- (start_jiffies + 1 + DELAY_CALIBRATION_TICKS)) {
+ while (time_before_eq(jiffies, start_jiffies + 1 +
+ DELAY_CALIBRATION_TICKS)) {
pre_end = end;
read_current_timer(&end);
}
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
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