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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 

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sparc64: Fix cpumask related build failure
  smp_call_function_single(): be slightly less stupid, fix
  smp_call_function_single(): be slightly less stupid
  rcu: fix bug in rcutorture system-shutdown code
This commit is contained in:
Linus Torvalds 2009-01-12 16:28:26 -08:00
parent b743791639 9d07933709
commit 1181a24499
5 changed files with 100 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/sparc/include/asm/topology_64.h
View File

@ -47,6 +47,10 @@ static inline int pcibus_to_node(struct pci_bus *pbus)
(pcibus_to_node(bus) == -1 ? \
CPU_MASK_ALL : \
node_to_cpumask(pcibus_to_node(bus)))
#define cpumask_of_pcibus(bus) \
(pcibus_to_node(bus) == -1 ? \
CPU_MASK_ALL_PTR : \
cpumask_of_node(pcibus_to_node(bus)))
#define SD_NODE_INIT (struct sched_domain) { \
.min_interval = 8, \

13
include/linux/smp.h
View File

@ -24,6 +24,9 @@ struct call_single_data {
/* total number of cpus in this system (may exceed NR_CPUS) */
extern unsigned int total_cpus;
int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
int wait);
#ifdef CONFIG_SMP
#include <linux/preempt.h>
@ -79,8 +82,6 @@ smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
return 0;
}
int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
int wait);
void __smp_call_function_single(int cpuid, struct call_single_data *data);
/*
@ -140,14 +141,6 @@ static inline int up_smp_call_function(void (*func)(void *), void *info)
static inline void smp_send_reschedule(int cpu) { }
#define num_booting_cpus() 1
#define smp_prepare_boot_cpu() do {} while (0)
#define smp_call_function_single(cpuid, func, info, wait) \
({ \
WARN_ON(cpuid != 0); \
local_irq_disable(); \
(func)(info); \
local_irq_enable(); \
0; \
})
#define smp_call_function_mask(mask, func, info, wait) \
(up_smp_call_function(func, info))
#define smp_call_function_many(mask, func, info, wait) \

6
kernel/Makefile
View File

@ -40,7 +40,11 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o
ifeq ($(CONFIG_USE_GENERIC_SMP_HELPERS),y)
obj-y += smp.o
else
obj-y += up.o
endif
obj-$(CONFIG_SMP) += spinlock.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
obj-$(CONFIG_PROVE_LOCKING) += spinlock.o

113
kernel/rcutorture.c
View File

@ -136,28 +136,46 @@ static int stutter_pause_test = 0;
#endif
int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT;
#define FULLSTOP_SHUTDOWN 1 /* Bail due to system shutdown/panic. */
#define FULLSTOP_CLEANUP 2 /* Orderly shutdown. */
static int fullstop; /* stop generating callbacks at test end. */
DEFINE_MUTEX(fullstop_mutex); /* protect fullstop transitions and */
/* spawning of kthreads. */
/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */
#define FULLSTOP_DONTSTOP 0 /* Normal operation. */
#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */
#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */
static int fullstop = FULLSTOP_RMMOD;
DEFINE_MUTEX(fullstop_mutex); /* Protect fullstop transitions and spawning */
/* of kthreads. */
/*
* Detect and respond to a signal-based shutdown.
* Detect and respond to a system shutdown.
*/
static int
rcutorture_shutdown_notify(struct notifier_block *unused1,
unsigned long unused2, void *unused3)
{
if (fullstop)
return NOTIFY_DONE;
mutex_lock(&fullstop_mutex);
if (!fullstop)
if (fullstop == FULLSTOP_DONTSTOP)
fullstop = FULLSTOP_SHUTDOWN;
else
printk(KERN_WARNING /* but going down anyway, so... */
"Concurrent 'rmmod rcutorture' and shutdown illegal!\n");
mutex_unlock(&fullstop_mutex);
return NOTIFY_DONE;
}
/*
* Absorb kthreads into a kernel function that won't return, so that
* they won't ever access module text or data again.
*/
static void rcutorture_shutdown_absorb(char *title)
{
if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) {
printk(KERN_NOTICE
"rcutorture thread %s parking due to system shutdown\n",
title);
schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT);
}
}
/*
* Allocate an element from the rcu_tortures pool.
*/
@ -219,13 +237,14 @@ rcu_random(struct rcu_random_state *rrsp)
}
static void
rcu_stutter_wait(void)
rcu_stutter_wait(char *title)
{
while ((stutter_pause_test || !rcutorture_runnable) && !fullstop) {
while (stutter_pause_test || !rcutorture_runnable) {
if (rcutorture_runnable)
schedule_timeout_interruptible(1);
else
schedule_timeout_interruptible(round_jiffies_relative(HZ));
rcutorture_shutdown_absorb(title);
}
}
@ -287,7 +306,7 @@ rcu_torture_cb(struct rcu_head *p)
int i;
struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu);
if (fullstop) {
if (fullstop != FULLSTOP_DONTSTOP) {
/* Test is ending, just drop callbacks on the floor. */
/* The next initialization will pick up the pieces. */
return;
@ -619,10 +638,11 @@ rcu_torture_writer(void *arg)
}
rcu_torture_current_version++;
oldbatch = cur_ops->completed();
rcu_stutter_wait();
} while (!kthread_should_stop() && !fullstop);
rcu_stutter_wait("rcu_torture_writer");
} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping");
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
rcutorture_shutdown_absorb("rcu_torture_writer");
while (!kthread_should_stop())
schedule_timeout_uninterruptible(1);
return 0;
}
@ -643,11 +663,12 @@ rcu_torture_fakewriter(void *arg)
schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10);
udelay(rcu_random(&rand) & 0x3ff);
cur_ops->sync();
rcu_stutter_wait();
} while (!kthread_should_stop() && !fullstop);
rcu_stutter_wait("rcu_torture_fakewriter");
} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping");
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
rcutorture_shutdown_absorb("rcu_torture_fakewriter");
while (!kthread_should_stop())
schedule_timeout_uninterruptible(1);
return 0;
}
@ -752,12 +773,13 @@ rcu_torture_reader(void *arg)
preempt_enable();
cur_ops->readunlock(idx);
schedule();
rcu_stutter_wait();
} while (!kthread_should_stop() && !fullstop);
rcu_stutter_wait("rcu_torture_reader");
} while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP);
VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping");
rcutorture_shutdown_absorb("rcu_torture_reader");
if (irqreader && cur_ops->irqcapable)
del_timer_sync(&t);
while (!kthread_should_stop() && fullstop != FULLSTOP_SHUTDOWN)
while (!kthread_should_stop())
schedule_timeout_uninterruptible(1);
return 0;
}
@ -854,7 +876,8 @@ rcu_torture_stats(void *arg)
do {
schedule_timeout_interruptible(stat_interval * HZ);
rcu_torture_stats_print();
} while (!kthread_should_stop() && !fullstop);
rcutorture_shutdown_absorb("rcu_torture_stats");
} while (!kthread_should_stop());
VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping");
return 0;
}
@ -866,52 +889,49 @@ static int rcu_idle_cpu; /* Force all torture tasks off this CPU */
*/
static void rcu_torture_shuffle_tasks(void)
{
cpumask_var_t tmp_mask;
cpumask_t tmp_mask;
int i;
if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL))
BUG();
cpumask_setall(tmp_mask);
cpus_setall(tmp_mask);
get_online_cpus();
/* No point in shuffling if there is only one online CPU (ex: UP) */
if (num_online_cpus() == 1)
goto out;
if (num_online_cpus() == 1) {
put_online_cpus();
return;
}
if (rcu_idle_cpu != -1)
cpumask_clear_cpu(rcu_idle_cpu, tmp_mask);
cpu_clear(rcu_idle_cpu, tmp_mask);
set_cpus_allowed_ptr(current, tmp_mask);
set_cpus_allowed_ptr(current, &tmp_mask);
if (reader_tasks) {
for (i = 0; i < nrealreaders; i++)
if (reader_tasks[i])
set_cpus_allowed_ptr(reader_tasks[i],
tmp_mask);
&tmp_mask);
}
if (fakewriter_tasks) {
for (i = 0; i < nfakewriters; i++)
if (fakewriter_tasks[i])
set_cpus_allowed_ptr(fakewriter_tasks[i],
tmp_mask);
&tmp_mask);
}
if (writer_task)
set_cpus_allowed_ptr(writer_task, tmp_mask);
set_cpus_allowed_ptr(writer_task, &tmp_mask);
if (stats_task)
set_cpus_allowed_ptr(stats_task, tmp_mask);
set_cpus_allowed_ptr(stats_task, &tmp_mask);
if (rcu_idle_cpu == -1)
rcu_idle_cpu = num_online_cpus() - 1;
else
rcu_idle_cpu--;
out:
put_online_cpus();
free_cpumask_var(tmp_mask);
}
/* Shuffle tasks across CPUs, with the intent of allowing each CPU in the
@ -925,7 +945,8 @@ rcu_torture_shuffle(void *arg)
do {
schedule_timeout_interruptible(shuffle_interval * HZ);
rcu_torture_shuffle_tasks();
} while (!kthread_should_stop() && !fullstop);
rcutorture_shutdown_absorb("rcu_torture_shuffle");
} while (!kthread_should_stop());
VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping");
return 0;
}
@ -940,10 +961,11 @@ rcu_torture_stutter(void *arg)
do {
schedule_timeout_interruptible(stutter * HZ);
stutter_pause_test = 1;
if (!kthread_should_stop() && !fullstop)
if (!kthread_should_stop())
schedule_timeout_interruptible(stutter * HZ);
stutter_pause_test = 0;
} while (!kthread_should_stop() && !fullstop);
rcutorture_shutdown_absorb("rcu_torture_stutter");
} while (!kthread_should_stop());
VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping");
return 0;
}
@ -970,15 +992,16 @@ rcu_torture_cleanup(void)
int i;
mutex_lock(&fullstop_mutex);
if (!fullstop) {
/* If being signaled, let it happen, then exit. */
if (fullstop == FULLSTOP_SHUTDOWN) {
printk(KERN_WARNING /* but going down anyway, so... */
"Concurrent 'rmmod rcutorture' and shutdown illegal!\n");
mutex_unlock(&fullstop_mutex);
schedule_timeout_interruptible(10 * HZ);
schedule_timeout_uninterruptible(10);
if (cur_ops->cb_barrier != NULL)
cur_ops->cb_barrier();
return;
}
fullstop = FULLSTOP_CLEANUP;
fullstop = FULLSTOP_RMMOD;
mutex_unlock(&fullstop_mutex);
unregister_reboot_notifier(&rcutorture_nb);
if (stutter_task) {
@ -1078,7 +1101,7 @@ rcu_torture_init(void)
else
nrealreaders = 2 * num_online_cpus();
rcu_torture_print_module_parms("Start of test");
fullstop = 0;
fullstop = FULLSTOP_DONTSTOP;
/* Set up the freelist. */

20
kernel/up.c Normal file
View File

@ -0,0 +1,20 @@
/*
* Uniprocessor-only support functions. The counterpart to kernel/smp.c
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/smp.h>
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int wait)
{
WARN_ON(cpu != 0);
local_irq_disable();
(func)(info);
local_irq_enable();
return 0;
}
EXPORT_SYMBOL(smp_call_function_single);