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author | Ingo Molnar <mingo@kernel.org> | 2014-05-22 13:36:10 +0400 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-05-22 13:36:10 +0400 |
commit | e14505a8d50882ff3bdd4b791b14d90a0881fa4d (patch) | |
tree | d2c3e9846b82b02187d33ebafb44fd6934bcd81f /kernel/torture.c | |
parent | 4b660a7f5c8099d88d1a43d8ae138965112592c7 (diff) | |
parent | 61f38db3e3c0e4c3be0858750e2cabeadaecac0c (diff) | |
download | linux-e14505a8d50882ff3bdd4b791b14d90a0881fa4d.tar.xz |
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney:
" 1. Update RCU documentation. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/634.
2. Miscellaneous fixes. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/645.
3. Torture-test changes. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/667.
4. Variable-name renaming cleanup, sent separately due to conflicts.
This was posted to LKML at https://lkml.org/lkml/2014/5/13/854.
5. Patch to suppress RCU stall warnings while sysrq requests are
being processed. This patch is the RCU portions of the patch
that Rik posted to LKML at https://lkml.org/lkml/2014/4/29/457.
The reason for pushing this patch ahead instead of waiting until
3.17 is that the NMI-based stack traces are messing up sysrq
output, and in some cases also messing up the system as well."
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/torture.c')
-rw-r--r-- | kernel/torture.c | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/kernel/torture.c b/kernel/torture.c index acc9afc2f26e..40bb511cca48 100644 --- a/kernel/torture.c +++ b/kernel/torture.c @@ -335,13 +335,8 @@ static void torture_shuffle_tasks(void) shuffle_idle_cpu = cpumask_next(shuffle_idle_cpu, shuffle_tmp_mask); if (shuffle_idle_cpu >= nr_cpu_ids) shuffle_idle_cpu = -1; - if (shuffle_idle_cpu != -1) { + else cpumask_clear_cpu(shuffle_idle_cpu, shuffle_tmp_mask); - if (cpumask_empty(shuffle_tmp_mask)) { - put_online_cpus(); - return; - } - } mutex_lock(&shuffle_task_mutex); list_for_each_entry(stp, &shuffle_task_list, st_l) @@ -533,7 +528,11 @@ void stutter_wait(const char *title) while (ACCESS_ONCE(stutter_pause_test) || (torture_runnable && !ACCESS_ONCE(*torture_runnable))) { if (stutter_pause_test) - schedule_timeout_interruptible(1); + if (ACCESS_ONCE(stutter_pause_test) == 1) + schedule_timeout_interruptible(1); + else + while (ACCESS_ONCE(stutter_pause_test)) + cond_resched(); else schedule_timeout_interruptible(round_jiffies_relative(HZ)); torture_shutdown_absorb(title); @@ -550,7 +549,11 @@ static int torture_stutter(void *arg) VERBOSE_TOROUT_STRING("torture_stutter task started"); do { if (!torture_must_stop()) { - schedule_timeout_interruptible(stutter); + if (stutter > 1) { + schedule_timeout_interruptible(stutter - 1); + ACCESS_ONCE(stutter_pause_test) = 2; + } + schedule_timeout_interruptible(1); ACCESS_ONCE(stutter_pause_test) = 1; } if (!torture_must_stop()) @@ -596,21 +599,27 @@ static void torture_stutter_cleanup(void) * The runnable parameter points to a flag that controls whether or not * the test is currently runnable. If there is no such flag, pass in NULL. */ -void __init torture_init_begin(char *ttype, bool v, int *runnable) +bool torture_init_begin(char *ttype, bool v, int *runnable) { mutex_lock(&fullstop_mutex); + if (torture_type != NULL) { + pr_alert("torture_init_begin: refusing %s init: %s running", + ttype, torture_type); + mutex_unlock(&fullstop_mutex); + return false; + } torture_type = ttype; verbose = v; torture_runnable = runnable; fullstop = FULLSTOP_DONTSTOP; - + return true; } EXPORT_SYMBOL_GPL(torture_init_begin); /* * Tell the torture module that initialization is complete. */ -void __init torture_init_end(void) +void torture_init_end(void) { mutex_unlock(&fullstop_mutex); register_reboot_notifier(&torture_shutdown_nb); @@ -642,6 +651,9 @@ bool torture_cleanup(void) torture_shuffle_cleanup(); torture_stutter_cleanup(); torture_onoff_cleanup(); + mutex_lock(&fullstop_mutex); + torture_type = NULL; + mutex_unlock(&fullstop_mutex); return false; } EXPORT_SYMBOL_GPL(torture_cleanup); @@ -674,8 +686,10 @@ EXPORT_SYMBOL_GPL(torture_must_stop_irq); */ void torture_kthread_stopping(char *title) { - if (verbose) - VERBOSE_TOROUT_STRING(title); + char buf[128]; + + snprintf(buf, sizeof(buf), "Stopping %s", title); + VERBOSE_TOROUT_STRING(buf); while (!kthread_should_stop()) { torture_shutdown_absorb(title); schedule_timeout_uninterruptible(1); |