linux-kernel - [RFC PATCH v1 4/4] zram: recompression: add ZRAM

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Date:   Mon, 21 Nov 2022 22:00:20 +0300
From:   Alexey Romanov <avromanov@...rdevices.ru>
To:     <minchan@...nel.org>, <senozhatsky@...omium.org>,
        <ngupta@...are.org>, <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <ddrokosov@...rdevices.ru>,
        Alexey Romanov <avromanov@...rdevices.ru>
Subject: [RFC PATCH v1 4/4] zram: recompression: add ZRAM_MERGED check

It is not possible to recompress merged pages in the current
implementation. Although, in the future it is possible to add
support for recompression of merged pages.

Signed-off-by: Alexey Romanov <avromanov@...rdevices.ru>
---
 drivers/block/zram/zram_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 7a267b37e5db..07661283ea15 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -2211,7 +2211,8 @@ static ssize_t recompress_store(struct device *dev,
 		if (zram_test_flag(zram, index, ZRAM_WB) ||
 		    zram_test_flag(zram, index, ZRAM_UNDER_WB) ||
 		    zram_test_flag(zram, index, ZRAM_SAME) ||
-		    zram_test_flag(zram, index, ZRAM_INCOMPRESSIBLE))
+		    zram_test_flag(zram, index, ZRAM_INCOMPRESSIBLE) ||
+		    zram_test_flag(zram, index, ZRAM_MERGED))
 			goto next;
 
 		err = zram_recompress(zram, index, page, threshold,
-- 
2.25.1