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Add generic helpers for arch IPI function calls

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This adds kernel/smp.c which contains helpers for IPI function calls. In
addition to supporting the existing smp_call_function() in a more efficient
manner, it also adds a more scalable variant called smp_call_function_single()
for calling a given function on a single CPU only.

The core of this is based on the x86-64 patch from Nick Piggin, lots of
changes since then. "Alan D. Brunelle" <Alan.Brunelle@hp.com> has
contributed lots of fixes and suggestions as well. Also thanks to
Paul E. McKenney <paulmck@linux.vnet.ibm.com> for reviewing RCU usage
and getting rid of the data allocation fallback deadlock.

Acked-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-06-26 11:21:34 +02:00
parent 543cf4cb3f
commit 3d44223327
6 changed files with 428 additions and 7 deletions
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2
init/main.c
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@ -31,6 +31,7 @@
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
#include <linux/security.h>
#include <linux/smp.h>
#include <linux/workqueue.h>
#include <linux/profile.h>
#include <linux/rcupdate.h>
@ -779,6 +780,7 @@ static void __init do_pre_smp_initcalls(void)
{
extern int spawn_ksoftirqd(void);
init_call_single_data();
migration_init();
spawn_ksoftirqd();
if (!nosoftlockup)