[merged mm-stable] zram-reset-per-priority-params-when-changing-algorithm-before-init.patch removed from -mm tree

[merged mm-stable] zram-reset-per-priority-params-when-changing-algorithm-before-init.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: zram: reset per-priority params when changing algorithm before init
has been removed from the -mm tree.  Its filename was
     zram-reset-per-priority-params-when-changing-algorithm-before-init.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Haoqin Huang <haoqinhuang@tencent.com>
Subject: zram: reset per-priority params when changing algorithm before init
Date: Tue, 4 Aug 2026 17:38:41 +0800

Parameters validated against one algorithm may be invalid for another
(e.g.  lz4 accepts level=65535 but zstd does not).  Although algorithm
changes are blocked after disksize is set, they are allowed before device
initialization.  Reset per-priority params on algorithm change so that
stale parameters do not silently carry over.

Link: https://lore.kernel.org/20260804093841.67920-6-haoqinhuang7@gmail.com
Signed-off-by: Haoqin Huang <haoqinhuang@tencent.com>
Signed-off-by: Rongwei Wang <zigiwang@tencent.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/block/zram/zram_drv.c |   23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

--- a/drivers/block/zram/zram_drv.c~zram-reset-per-priority-params-when-changing-algorithm-before-init
+++ a/drivers/block/zram/zram_drv.c
@@ -1652,6 +1652,17 @@ static void comp_algorithm_set(struct zr
 	zram->comp_algs[prio] = alg;
 }
 
+static void comp_params_reset(struct zram *zram, u32 prio)
+{
+	struct zcomp_params *params = &zram->params[prio];
+
+	vfree(params->dict);
+	params->level = ZCOMP_PARAM_NOT_SET;
+	params->deflate.winbits = ZCOMP_PARAM_NOT_SET;
+	params->dict_sz = 0;
+	params->dict = NULL;
+}
+
 static int __comp_algorithm_store(struct zram *zram, u32 prio, const char *buf)
 {
 	const char *alg;
@@ -1672,20 +1683,10 @@ static int __comp_algorithm_store(struct
 	}
 
 	comp_algorithm_set(zram, prio, alg);
+	comp_params_reset(zram, prio);
 	return 0;
 }
 
-static void comp_params_reset(struct zram *zram, u32 prio)
-{
-	struct zcomp_params *params = &zram->params[prio];
-
-	vfree(params->dict);
-	params->level = ZCOMP_PARAM_NOT_SET;
-	params->deflate.winbits = ZCOMP_PARAM_NOT_SET;
-	params->dict_sz = 0;
-	params->dict = NULL;
-}
-
 static int comp_params_store(struct zram *zram, u32 prio, s32 level,
 			     const char *dict_path,
 			     struct deflate_params *deflate_params)
_

Patches currently in -mm which might be from haoqinhuang@tencent.com are