redonkable/remarkable-linux
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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  softlockup: fix NMI hangs due to lock race - 2.6.26-rc regression
  rcupreempt: remove export of rcu_batches_completed_bh
  cpuset: limit the input of cpuset.sched_relax_domain_level
This commit is contained in:
Linus Torvalds 2008-06-20 12:37:13 -07:00
parent e570dc2a50 9c106c119e
commit 1f1e2ce8a5
5 changed files with 19 additions and 11 deletions
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2
Documentation/cpusets.txt
View file

@ -542,7 +542,7 @@ otherwise initial value -1 that indicates the cpuset has no request.
2 : search cores in a package.
3 : search cpus in a node [= system wide on non-NUMA system]
( 4 : search nodes in a chunk of node [on NUMA system] )
( 5~ : search system wide [on NUMA system])
( 5 : search system wide [on NUMA system] )
This file is per-cpuset and affect the sched domain where the cpuset
belongs to. Therefore if the flag 'sched_load_balance' of a cpuset

4
kernel/cpuset.c
View file

@ -1037,8 +1037,8 @@ int current_cpuset_is_being_rebound(void)
static int update_relax_domain_level(struct cpuset *cs, s64 val)
{
if ((int)val < 0)
val = -1;
if (val < -1 || val >= SD_LV_MAX)
return -EINVAL;
if (val != cs->relax_domain_level) {
cs->relax_domain_level = val;

2
kernel/rcupreempt.c
View file

@ -217,8 +217,6 @@ long rcu_batches_completed(void)
}
EXPORT_SYMBOL_GPL(rcu_batches_completed);
EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
void __rcu_read_lock(void)
{
int idx;

7
kernel/sched.c
View file

@ -6879,7 +6879,12 @@ static int default_relax_domain_level = -1;
static int __init setup_relax_domain_level(char *str)
{
default_relax_domain_level = simple_strtoul(str, NULL, 0);
unsigned long val;
val = simple_strtoul(str, NULL, 0);
if (val < SD_LV_MAX)
default_relax_domain_level = val;
return 1;
}
__setup("relax_domain_level=", setup_relax_domain_level);

15
kernel/softlockup.c
View file

@ -49,12 +49,17 @@ static unsigned long get_timestamp(int this_cpu)
return cpu_clock(this_cpu) >> 30LL; /* 2^30 ~= 10^9 */
}
void touch_softlockup_watchdog(void)
static void __touch_softlockup_watchdog(void)
{
int this_cpu = raw_smp_processor_id();
__raw_get_cpu_var(touch_timestamp) = get_timestamp(this_cpu);
}
void touch_softlockup_watchdog(void)
{
__raw_get_cpu_var(touch_timestamp) = 0;
}
EXPORT_SYMBOL(touch_softlockup_watchdog);
void touch_all_softlockup_watchdogs(void)
@ -80,7 +85,7 @@ void softlockup_tick(void)
unsigned long now;
if (touch_timestamp == 0) {
touch_softlockup_watchdog();
__touch_softlockup_watchdog();
return;
}
@ -95,7 +100,7 @@ void softlockup_tick(void)
/* do not print during early bootup: */
if (unlikely(system_state != SYSTEM_RUNNING)) {
touch_softlockup_watchdog();
__touch_softlockup_watchdog();
return;
}
@ -214,7 +219,7 @@ static int watchdog(void *__bind_cpu)
sched_setscheduler(current, SCHED_FIFO, &param);
/* initialize timestamp */
touch_softlockup_watchdog();
__touch_softlockup_watchdog();
set_current_state(TASK_INTERRUPTIBLE);
/*
@ -223,7 +228,7 @@ static int watchdog(void *__bind_cpu)
* debug-printout triggers in softlockup_tick().
*/
while (!kthread_should_stop()) {
touch_softlockup_watchdog();
__touch_softlockup_watchdog();
schedule();
if (kthread_should_stop())