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| author | Andrew Morton <akpm@osdl.org> | 2006-07-03 17:32:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-03 21:25:20 -0700 |
| commit | d8cb7c1ded6e5a80a7335716dde60784a0d51c1d (patch) | |
| tree | e7c975ad049fa84549ef1c9fef45f9f96ccae829 /kernel | |
| parent | 38c54ee8d5338f49aca986081ea41a987c15cf9d (diff) | |
| download | lwn-d8cb7c1ded6e5a80a7335716dde60784a0d51c1d.tar.gz lwn-d8cb7c1ded6e5a80a7335716dde60784a0d51c1d.zip | |
[PATCH] revert "kthread: convert stop_machine into a kthread"
Jiri reports that the stop_machin kthread conversion caused his machine to
hang when suspending. Hyperthreading is apparently involved.
I don't see why that would be and I can't reproduce it. Revert to the 2.6.17
code.
Cc: "Serge E. Hallyn" <serue@us.ibm.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/stop_machine.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 2c0aacc37c55..dcfb5d731466 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -4,7 +4,6 @@ #include <linux/cpu.h> #include <linux/err.h> #include <linux/syscalls.h> -#include <linux/kthread.h> #include <asm/atomic.h> #include <asm/semaphore.h> #include <asm/uaccess.h> @@ -26,11 +25,13 @@ static unsigned int stopmachine_num_threads; static atomic_t stopmachine_thread_ack; static DECLARE_MUTEX(stopmachine_mutex); -static int stopmachine(void *unused) +static int stopmachine(void *cpu) { int irqs_disabled = 0; int prepared = 0; + set_cpus_allowed(current, cpumask_of_cpu((int)(long)cpu)); + /* Ack: we are alive */ smp_mb(); /* Theoretically the ack = 0 might not be on this CPU yet. */ atomic_inc(&stopmachine_thread_ack); @@ -84,8 +85,7 @@ static void stopmachine_set_state(enum stopmachine_state state) static int stop_machine(void) { - int ret = 0; - unsigned int i; + int i, ret = 0; struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; /* One high-prio thread per cpu. We'll do this one. */ @@ -96,16 +96,11 @@ static int stop_machine(void) stopmachine_state = STOPMACHINE_WAIT; for_each_online_cpu(i) { - struct task_struct *tsk; if (i == raw_smp_processor_id()) continue; - tsk = kthread_create(stopmachine, NULL, "stopmachine"); - if (IS_ERR(tsk)) { - ret = PTR_ERR(tsk); + ret = kernel_thread(stopmachine, (void *)(long)i,CLONE_KERNEL); + if (ret < 0) break; - } - kthread_bind(tsk, i); - wake_up_process(tsk); stopmachine_num_threads++; } |