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Date: Mon, 28 Jan 2013 09:38:23 +0900 From: Minchan Kim <minchan@...nel.org> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Dan Magenheimer <dan.magenheimer@...cle.com>, Nitin Gupta <ngupta@...are.org>, Konrad Rzeszutek Wilk <konrad@...nok.org>, Seth Jennings <sjenning@...ux.vnet.ibm.com>, Pekka Enberg <penberg@...helsinki.fi>, Minchan Kim <minchan@...nel.org>, stable@...r.kernel.org, Jerome Marchand <jmarchan@...hat.com> Subject: [RESEND PATCH v5 1/4] zram: Fix deadlock bug in partial write Now zram allocates new page with GFP_KERNEL in zram I/O path if IO is partial. Unfortunately, It may cuase deadlock with reclaim path so this patch solves the problem. Cc: stable@...r.kernel.org Cc: Jerome Marchand <jmarchan@...hat.com> Acked-by: Nitin Gupta <ngupta@...are.org> Signed-off-by: Minchan Kim <minchan@...nel.org> --- drivers/staging/zram/zram_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 61fb8f1..b285b3a 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -220,7 +220,7 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, user_mem = kmap_atomic(page); if (is_partial_io(bvec)) /* Use a temporary buffer to decompress the page */ - uncmem = kmalloc(PAGE_SIZE, GFP_KERNEL); + uncmem = kmalloc(PAGE_SIZE, GFP_ATOMIC); else uncmem = user_mem; @@ -268,7 +268,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, * This is a partial IO. We need to read the full page * before to write the changes. */ - uncmem = kmalloc(PAGE_SIZE, GFP_KERNEL); + uncmem = kmalloc(PAGE_SIZE, GFP_NOIO); if (!uncmem) { pr_info("Error allocating temp memory!\n"); ret = -ENOMEM; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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