block: kill swap_io_context()

It blindly copies everything in the io_context, including the lock.
That doesn't work so well for either lock ordering or lockdep.

There seems zero point in swapping io contexts on a request to request
merge, so the best point of action is to just remove it.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 9 deletions

diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 6d1675508eb5..80245dc30c75 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -176,15 +176,6 @@ void copy_io_context(struct io_context **pdst, struct io_context **psrc)
 }
 EXPORT_SYMBOL(copy_io_context);
 
-void swap_io_context(struct io_context **ioc1, struct io_context **ioc2)
-{
-        struct io_context *temp;
-        temp = *ioc1;
-        *ioc1 = *ioc2;
-        *ioc2 = temp;
-}
-EXPORT_SYMBOL(swap_io_context);
-
 int __init blk_ioc_init(void)
 {
         iocontext_cachep = kmem_cache_create("blkdev_ioc",