zram_drv: allow reclaim on bio_alloc

The read_from_bdev_async is not called on atomic context.  So GFP_NOIO
is available rather than GFP_ATOMIC.  If there were reclaimable pages
with GFP_NOIO, we can avoid allocation failure and page fault failure.

Link: https://lkml.kernel.org/r/20210908005241.28062-1-jaewon31.kim@samsung.com
Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
Reported-by: Yong-Taek Lee <ytk.lee@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index fcaf2750f68f7c5a7f51d8eeb67c61a592736fbc..081e77d595d78d3bc3112e6ec4ffc2e1c01db1d7 100644 (file)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -587,7 +587,7 @@ static int read_from_bdev_async(struct zram *zram, struct bio_vec *bvec,
 {
        struct bio *bio;
 
-       bio = bio_alloc(GFP_ATOMIC, 1);
+       bio = bio_alloc(GFP_NOIO, 1);
        if (!bio)
                return -ENOMEM;