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authorRusty Russell <rusty@rustcorp.com.au>2008-07-28 21:16:28 +0400
committerRusty Russell <rusty@rustcorp.com.au>2008-07-28 06:16:29 +0400
commitffdb5976c47609c862917d4c186ecbb5706d2dda (patch)
tree7a8485260922290080094adc25f3cbebd4ad506b /include/linux/stop_machine.h
parent5c2aed622571ac7c3c6ec182d6d3c318e4b45c8b (diff)
downloadlinux-ffdb5976c47609c862917d4c186ecbb5706d2dda.tar.xz
Simplify stop_machine
stop_machine creates a kthread which creates kernel threads. We can create those threads directly and simplify things a little. Some care must be taken with CPU hotunplug, which has special needs, but that code seems more robust than it was in the past. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'include/linux/stop_machine.h')
-rw-r--r--include/linux/stop_machine.h20
1 files changed, 8 insertions, 12 deletions
diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index 18af011c13af..36c2c7284eb3 100644
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -17,13 +17,12 @@
* @data: the data ptr for the @fn()
* @cpu: if @cpu == n, run @fn() on cpu n
* if @cpu == NR_CPUS, run @fn() on any cpu
- * if @cpu == ALL_CPUS, run @fn() first on the calling cpu, and then
- * concurrently on all the other cpus
+ * if @cpu == ALL_CPUS, run @fn() on every online CPU.
*
- * Description: This causes a thread to be scheduled on every other cpu,
- * each of which disables interrupts, and finally interrupts are disabled
- * on the current CPU. The result is that noone is holding a spinlock
- * or inside any other preempt-disabled region when @fn() runs.
+ * Description: This causes a thread to be scheduled on every cpu,
+ * each of which disables interrupts. The result is that noone is
+ * holding a spinlock or inside any other preempt-disabled region when
+ * @fn() runs.
*
* This can be thought of as a very heavy write lock, equivalent to
* grabbing every spinlock in the kernel. */
@@ -35,13 +34,10 @@ int stop_machine_run(int (*fn)(void *), void *data, unsigned int cpu);
* @data: the data ptr for the @fn
* @cpu: the cpu to run @fn on (or any, if @cpu == NR_CPUS.
*
- * Description: This is a special version of the above, which returns the
- * thread which has run @fn(): kthread_stop will return the return value
- * of @fn(). Used by hotplug cpu.
+ * Description: This is a special version of the above, which assumes cpus
+ * won't come or go while it's being called. Used by hotplug cpu.
*/
-struct task_struct *__stop_machine_run(int (*fn)(void *), void *data,
- unsigned int cpu);
-
+int __stop_machine_run(int (*fn)(void *), void *data, unsigned int cpu);
#else
static inline int stop_machine_run(int (*fn)(void *), void *data,