[merged mm-stable] zram-limit-max-recompress-prio-to-num_active_comps.patch removed from -mm tree

[merged mm-stable] zram-limit-max-recompress-prio-to-num_active_comps.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: zram: limit max recompress prio to num_active_comps
has been removed from the -mm tree.  Its filename was
     zram-limit-max-recompress-prio-to-num_active_comps.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: Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: zram: limit max recompress prio to num_active_comps
Date: Mon, 3 Mar 2025 11:03:17 +0900

Use the actual number of algorithms zram was configure with instead of
theoretical limit of ZRAM_MAX_COMPS.

Also make sure that min prio is not above max prio.

Link: https://lkml.kernel.org/r/20250303022425.285971-9-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/block/zram/zram_drv.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

--- a/drivers/block/zram/zram_drv.c~zram-limit-max-recompress-prio-to-num_active_comps
+++ a/drivers/block/zram/zram_drv.c
@@ -2027,16 +2027,19 @@ static ssize_t recompress_store(struct d
 				struct device_attribute *attr,
 				const char *buf, size_t len)
 {
-	u32 prio = ZRAM_SECONDARY_COMP, prio_max = ZRAM_MAX_COMPS;
 	struct zram *zram = dev_to_zram(dev);
 	char *args, *param, *val, *algo = NULL;
 	u64 num_recomp_pages = ULLONG_MAX;
 	struct zram_pp_ctl *ctl = NULL;
 	struct zram_pp_slot *pps;
 	u32 mode = 0, threshold = 0;
+	u32 prio, prio_max;
 	struct page *page;
 	ssize_t ret;
 
+	prio = ZRAM_SECONDARY_COMP;
+	prio_max = zram->num_active_comps;
+
 	args = skip_spaces(buf);
 	while (*args) {
 		args = next_arg(args, &param, &val);
@@ -2089,7 +2092,7 @@ static ssize_t recompress_store(struct d
 			if (prio == ZRAM_PRIMARY_COMP)
 				prio = ZRAM_SECONDARY_COMP;
 
-			prio_max = min(prio + 1, ZRAM_MAX_COMPS);
+			prio_max = prio + 1;
 			continue;
 		}
 	}
@@ -2117,7 +2120,7 @@ static ssize_t recompress_store(struct d
 				continue;
 
 			if (!strcmp(zram->comp_algs[prio], algo)) {
-				prio_max = min(prio + 1, ZRAM_MAX_COMPS);
+				prio_max = prio + 1;
 				found = true;
 				break;
 			}
@@ -2129,6 +2132,12 @@ static ssize_t recompress_store(struct d
 		}
 	}
 
+	prio_max = min(prio_max, (u32)zram->num_active_comps);
+	if (prio >= prio_max) {
+		ret = -EINVAL;
+		goto release_init_lock;
+	}
+
 	page = alloc_page(GFP_KERNEL);
 	if (!page) {
 		ret = -ENOMEM;
_

Patches currently in -mm which might be from senozhatsky@chromium.org are