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authorChristoph Hellwig <hch@infradead.org>2014-01-30 15:45:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-30 16:56:54 -0800
commit6897fc22ea01b562b55c6168592bcbd3ee62b006 (patch)
tree034c4b774880c2bbf8a9347acef749478a3443b0 /include
parent0c692d07842a67d9aa6b8266a80e4ac460a5c1a2 (diff)
downloadlinux-6897fc22ea01b562b55c6168592bcbd3ee62b006.tar.bz2
kernel: use lockless list for smp_call_function_single
Make smp_call_function_single and friends more efficient by using a lockless list. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev.h5
-rw-r--r--include/linux/smp.h6
2 files changed, 6 insertions, 5 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0375654adb28..8678c4322b44 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -95,10 +95,7 @@ enum rq_cmd_type_bits {
* as well!
*/
struct request {
- union {
- struct list_head queuelist;
- struct llist_node ll_list;
- };
+ struct list_head queuelist;
union {
struct call_single_data csd;
struct work_struct mq_flush_data;
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 5da22ee42e16..3834f43f9993 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -11,12 +11,16 @@
#include <linux/list.h>
#include <linux/cpumask.h>
#include <linux/init.h>
+#include <linux/llist.h>
extern void cpu_idle(void);
typedef void (*smp_call_func_t)(void *info);
struct call_single_data {
- struct list_head list;
+ union {
+ struct list_head list;
+ struct llist_node llist;
+ };
smp_call_func_t func;
void *info;
u16 flags;