The patch titled
clocksource: disallow setting jiffies as the clocksource
has been removed from the -mm tree. Its filename was
clocksource-disallow-setting-jiffies-as-the-clocksource.patch
This patch was dropped because an alternative patch was merged
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: clocksource: disallow setting jiffies as the clocksource
From: Luming Yu <luming.yu@xxxxxxxxx>
As reported in https://bugzilla.redhat.com/show_bug.cgi?id=496028,
echo jiffies > clocksource0/current_clocksource
makes the system crash.
I reproduced the problem with upstream kernel. The root cause is that
jiffies is just a variable in memory, it relies on other clock source to
tick, and it never ticks on itself.
Signed-off-by: Yu Luming <luming.yu@xxxxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/time/clocksource.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN kernel/time/clocksource.c~clocksource-disallow-setting-jiffies-as-the-clocksource kernel/time/clocksource.c
--- a/kernel/time/clocksource.c~clocksource-disallow-setting-jiffies-as-the-clocksource
+++ a/kernel/time/clocksource.c
@@ -504,8 +504,9 @@ static ssize_t sysfs_override_clocksourc
/* try to select it: */
list_for_each_entry(cs, &clocksource_list, list) {
if (strlen(cs->name) == len &&
- !strcmp(cs->name, override_name))
- ovr = cs;
+ !strcmp(cs->name, override_name) &&
+ cs != &clocksource_jiffies)
+ ovr = cs;
}
}
_
Patches currently in -mm which might be from luming.yu@xxxxxxxxx are
linux-next.patch
clocksource-disallow-setting-jiffies-as-the-clocksource.patch
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