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authorTim Deegan <Tim.Deegan@citrix.com>2011-02-10 08:50:41 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-10 11:00:09 -0800
commit70a062286b9dfcbd24d2e11601aecfead5cf709a (patch)
tree126a1e3f9561a3cb4159714c96db1ddd4171756d /init
parent6148a47ac3872092d4bc4888838bec6dff16654d (diff)
downloadlinux-2.6.38-lt-ux500-70a062286b9dfcbd24d2e11601aecfead5cf709a.tar.gz
fix jiffy calculations in calibrate_delay_direct to handle overflow
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 <Tim.Deegan@citrix.com> [jbeulich@novell.com: !time_after() -> time_before_eq() as suggested by Jiri Slaby] Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/calibrate.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/init/calibrate.c b/init/calibrate.c
index 6eb48e53d61..24fe022c55f 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -66,7 +66,7 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
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_delay_direct(void)
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);
}