[PATCH V2 2/2] fs/aio.c: use get_user_pages_non_movable() to pin ring pages when support memory hotremove

[Lin Feng]

This patch gets around the aio ring pages can't be migrated bug caused by
get_user_pages() via using the new function. It only works as configed with
CONFIG_MEMORY_HOTREMOVE, otherwise it falls back to use the old version
 of get_user_pages().

Cc: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Zach Brown <zab@xxxxxxxxxx>
Reviewed-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Reviewed-by: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>
---
 fs/aio.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 71f613c..f7a0d5c 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -138,8 +138,8 @@ static int aio_setup_ring(struct kioctx *ctx)
 	}
 
 	dprintk("mmap address: 0x%08lx\n", info->mmap_base);
-	info->nr_pages = get_user_pages(current, ctx->mm,
-					info->mmap_base, nr_pages, 
+	info->nr_pages = get_user_pages_non_movable(current, ctx->mm,
+					info->mmap_base, nr_pages,
 					1, 0, info->ring_pages, NULL);
 	up_write(&ctx->mm->mmap_sem);
 
-- 
1.7.1

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