Merge tag 'mm-stable-2025-06-01-14-06' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull more MM updates from Andrew Morton:

 - "zram: support algorithm-specific parameters" from Sergey Senozhatsky
   adds infrastructure for passing algorithm-specific parameters into
   zram. A single parameter `winbits' is implemented at this time.

 - "memcg: nmi-safe kmem charging" from Shakeel Butt makes memcg
   charging nmi-safe, which is required by BFP, which can operate in NMI
   context.

 - "Some random fixes and cleanup to shmem" from Kemeng Shi implements
   small fixes and cleanups in the shmem code.

 - "Skip mm selftests instead when kernel features are not present" from
   Zi Yan fixes some issues in the MM selftest code.

 - "mm/damon: build-enable essential DAMON components by default" from
   SeongJae Park reworks DAMON Kconfig to make it easier to enable
   CONFIG_DAMON.

 - "sched/numa: add statistics of numa balance task migration" from Libo
   Chen adds more info into sysfs and procfs files to improve visibility
   into the NUMA balancer's task migration activity.

 - "selftests/mm: cow and gup_longterm cleanups" from Mark Brown
   provides various updates to some of the MM selftests to make them
   play better with the overall containing framework.

* tag 'mm-stable-2025-06-01-14-06' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (43 commits)
  mm/khugepaged: clean up refcount check using folio_expected_ref_count()
  selftests/mm: fix test result reporting in gup_longterm
  selftests/mm: report unique test names for each cow test
  selftests/mm: add helper for logging test start and results
  selftests/mm: use standard ksft_finished() in cow and gup_longterm
  selftests/damon/_damon_sysfs: skip testcases if CONFIG_DAMON_SYSFS is disabled
  sched/numa: add statistics of numa balance task
  sched/numa: fix task swap by skipping kernel threads
  tools/testing: check correct variable in open_procmap()
  tools/testing/vma: add missing function stub
  mm/gup: update comment explaining why gup_fast() disables IRQs
  selftests/mm: two fixes for the pfnmap test
  mm/khugepaged: fix race with folio split/free using temporary reference
  mm: add CONFIG_PAGE_BLOCK_ORDER to select page block order
  mmu_notifiers: remove leftover stub macros
  selftests/mm: deduplicate test names in madv_populate
  kcov: rust: add flags for KCOV with Rust
  mm: rust: make CONFIG_MMU ifdefs more narrow
  mmu_gather: move tlb flush for VM_PFNMAP/VM_MIXEDMAP vmas into free_pgtables()
  mm/damon/Kconfig: enable CONFIG_DAMON by default
  ...

6 files changed, 35 insertions, 13 deletions

diff --git a/drivers/block/zram/backend_deflate.c b/drivers/block/zram/backend_deflate.c
index 0f7f252c12f4..b75016e0e654 100644
--- a/drivers/block/zram/backend_deflate.c
+++ b/drivers/block/zram/backend_deflate.c
@@ -8,7 +8,7 @@
 #include "backend_deflate.h"
 
 /* Use the same value as crypto API */
-#define DEFLATE_DEF_WINBITS		11
+#define DEFLATE_DEF_WINBITS		(-11)
 #define DEFLATE_DEF_MEMLEVEL		MAX_MEM_LEVEL
 
 struct deflate_ctx {
@@ -22,8 +22,10 @@ static void deflate_release_params(struct zcomp_params *params)
 
 static int deflate_setup_params(struct zcomp_params *params)
 {
-	if (params->level == ZCOMP_PARAM_NO_LEVEL)
+	if (params->level == ZCOMP_PARAM_NOT_SET)
 		params->level = Z_DEFAULT_COMPRESSION;
+	if (params->deflate.winbits == ZCOMP_PARAM_NOT_SET)
+		params->deflate.winbits = DEFLATE_DEF_WINBITS;
 
 	return 0;
 }
@@ -57,13 +59,13 @@ static int deflate_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
 		return -ENOMEM;
 
 	ctx->context = zctx;
-	sz = zlib_deflate_workspacesize(-DEFLATE_DEF_WINBITS, MAX_MEM_LEVEL);
+	sz = zlib_deflate_workspacesize(params->deflate.winbits, MAX_MEM_LEVEL);
 	zctx->cctx.workspace = vzalloc(sz);
 	if (!zctx->cctx.workspace)
 		goto error;
 
 	ret = zlib_deflateInit2(&zctx->cctx, params->level, Z_DEFLATED,
-				-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
+				params->deflate.winbits, DEFLATE_DEF_MEMLEVEL,
 				Z_DEFAULT_STRATEGY);
 	if (ret != Z_OK)
 		goto error;
@@ -73,7 +75,7 @@ static int deflate_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
 	if (!zctx->dctx.workspace)
 		goto error;
 
-	ret = zlib_inflateInit2(&zctx->dctx, -DEFLATE_DEF_WINBITS);
+	ret = zlib_inflateInit2(&zctx->dctx, params->deflate.winbits);
 	if (ret != Z_OK)
 		goto error;
 
diff --git a/drivers/block/zram/backend_lz4.c b/drivers/block/zram/backend_lz4.c
index 847f3334eb38..daccd60857eb 100644
--- a/drivers/block/zram/backend_lz4.c
+++ b/drivers/block/zram/backend_lz4.c
@@ -18,7 +18,7 @@ static void lz4_release_params(struct zcomp_params *params)
 
 static int lz4_setup_params(struct zcomp_params *params)
 {
-	if (params->level == ZCOMP_PARAM_NO_LEVEL)
+	if (params->level == ZCOMP_PARAM_NOT_SET)
 		params->level = LZ4_ACCELERATION_DEFAULT;
 
 	return 0;
diff --git a/drivers/block/zram/backend_lz4hc.c b/drivers/block/zram/backend_lz4hc.c
index 5f37d5abcaeb..9e8a35dfa56d 100644
--- a/drivers/block/zram/backend_lz4hc.c
+++ b/drivers/block/zram/backend_lz4hc.c
@@ -18,7 +18,7 @@ static void lz4hc_release_params(struct zcomp_params *params)
 
 static int lz4hc_setup_params(struct zcomp_params *params)
 {
-	if (params->level == ZCOMP_PARAM_NO_LEVEL)
+	if (params->level == ZCOMP_PARAM_NOT_SET)
 		params->level = LZ4HC_DEFAULT_CLEVEL;
 
 	return 0;
diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c
index 22c8067536f3..81defb98ed09 100644
--- a/drivers/block/zram/backend_zstd.c
+++ b/drivers/block/zram/backend_zstd.c
@@ -58,7 +58,7 @@ static int zstd_setup_params(struct zcomp_params *params)
 		return -ENOMEM;
 
 	params->drv_data = zp;
-	if (params->level == ZCOMP_PARAM_NO_LEVEL)
+	if (params->level == ZCOMP_PARAM_NOT_SET)
 		params->level = zstd_default_clevel();
 
 	zp->cprm = zstd_get_params(params->level, PAGE_SIZE);
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index 25339ed1e07e..4acffe671a5e 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -5,7 +5,11 @@
 
 #include <linux/mutex.h>
 
-#define ZCOMP_PARAM_NO_LEVEL	INT_MIN
+#define ZCOMP_PARAM_NOT_SET	INT_MIN
+
+struct deflate_params {
+	s32 winbits;
+};
 
 /*
  * Immutable driver (backend) parameters. The driver may attach private
@@ -17,6 +21,9 @@ struct zcomp_params {
 	void *dict;
 	size_t dict_sz;
 	s32 level;
+	union {
+		struct deflate_params deflate;
+	};
 
 	void *drv_data;
 };
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 94e6e9b80bf0..54c57103715f 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1276,13 +1276,15 @@ static void comp_params_reset(struct zram *zram, u32 prio)
 	struct zcomp_params *params = &zram->params[prio];
 
 	vfree(params->dict);
-	params->level = ZCOMP_PARAM_NO_LEVEL;
+	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)
+			     const char *dict_path,
+			     struct deflate_params *deflate_params)
 {
 	ssize_t sz = 0;
 
@@ -1300,6 +1302,7 @@ static int comp_params_store(struct zram *zram, u32 prio, s32 level,
 
 	zram->params[prio].dict_sz = sz;
 	zram->params[prio].level = level;
+	zram->params[prio].deflate.winbits = deflate_params->winbits;
 	return 0;
 }
 
@@ -1308,11 +1311,14 @@ static ssize_t algorithm_params_store(struct device *dev,
 				      const char *buf,
 				      size_t len)
 {
-	s32 prio = ZRAM_PRIMARY_COMP, level = ZCOMP_PARAM_NO_LEVEL;
+	s32 prio = ZRAM_PRIMARY_COMP, level = ZCOMP_PARAM_NOT_SET;
 	char *args, *param, *val, *algo = NULL, *dict_path = NULL;
+	struct deflate_params deflate_params;
 	struct zram *zram = dev_to_zram(dev);
 	int ret;
 
+	deflate_params.winbits = ZCOMP_PARAM_NOT_SET;
+
 	args = skip_spaces(buf);
 	while (*args) {
 		args = next_arg(args, &param, &val);
@@ -1343,6 +1349,13 @@ static ssize_t algorithm_params_store(struct device *dev,
 			dict_path = val;
 			continue;
 		}
+
+		if (!strcmp(param, "deflate.winbits")) {
+			ret = kstrtoint(val, 10, &deflate_params.winbits);
+			if (ret)
+				return ret;
+			continue;
+		}
 	}
 
 	/* Lookup priority by algorithm name */
@@ -1364,7 +1377,7 @@ static ssize_t algorithm_params_store(struct device *dev,
 	if (prio < ZRAM_PRIMARY_COMP || prio >= ZRAM_MAX_COMPS)
 		return -EINVAL;
 
-	ret = comp_params_store(zram, prio, level, dict_path);
+	ret = comp_params_store(zram, prio, level, dict_path, &deflate_params);
 	return ret ? ret : len;
 }