+ mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/memcontrol: use kstrtobool for swapaccount param parsing
has been added to the -mm mm-unstable branch.  Its filename is
     mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Liu Shixin <liushixin2@huawei.com>
Subject: mm/memcontrol: use kstrtobool for swapaccount param parsing
Date: Thu, 8 Sep 2022 16:34:52 +0800

Use kstrtobool which is more powerful to handle all kinds of parameters
like 'Yy1Nn0' or [oO][NnFf] for "on" and "off".

Link: https://lkml.kernel.org/r/20220908083452.2844125-1-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Liu Shixin <liushixin2@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/kernel-parameters.txt |    7 ++++---
 mm/memcontrol.c                                 |    8 ++++----
 mm/swap_cgroup.c                                |    2 +-
 3 files changed, 9 insertions(+), 8 deletions(-)

--- a/Documentation/admin-guide/kernel-parameters.txt~mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -6037,10 +6037,11 @@
 			Execution Facility on pSeries.
 
 	swapaccount=	[KNL]
-			Format: [0|1]
+			Format: { [oO][Nn]/Y/y/1 | [oO][Ff]/N/n/0 }
 			Enable accounting of swap in memory resource
-			controller if no parameter or 1 is given or disable
-			it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
+			controller if no parameter or [oO][Nn]/Y/y/1 is given
+			or disable it if [oO][Ff]/N/n/0 is given
+			(See Documentation/admin-guide/cgroup-v1/memory.rst)
 
 	swiotlb=	[ARM,IA-64,PPC,MIPS,X86]
 			Format: { <int> [,<int>] | force | noforce }
--- a/mm/memcontrol.c~mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing
+++ a/mm/memcontrol.c
@@ -7507,10 +7507,10 @@ bool mem_cgroup_swap_full(struct folio *
 
 static int __init setup_swap_account(char *s)
 {
-	if (!strcmp(s, "1"))
-		cgroup_memory_noswap = false;
-	else if (!strcmp(s, "0"))
-		cgroup_memory_noswap = true;
+	bool res;
+
+	if (!kstrtobool(s, &res))
+		cgroup_memory_noswap = !res;
 	return 1;
 }
 __setup("swapaccount=", setup_swap_account);
--- a/mm/swap_cgroup.c~mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing
+++ a/mm/swap_cgroup.c
@@ -194,7 +194,7 @@ int swap_cgroup_swapon(int type, unsigne
 	return 0;
 nomem:
 	pr_info("couldn't allocate enough memory for swap_cgroup\n");
-	pr_info("swap_cgroup can be disabled by swapaccount=0 boot option\n");
+	pr_info("swap_cgroup can be disabled by swapaccount=[oO][Ff]/N/n/0 boot option\n");
 	return -ENOMEM;
 }
 
_

Patches currently in -mm which might be from liushixin2@huawei.com are

revert-frontswap-remove-support-for-multiple-ops.patch
revert-mm-mark-swap_lock-and-swap_active_head-static.patch
revert-frontswap-simplify-frontswap_register_ops.patch
mm-zswap-replace-zswap_init_started-failed-with-zswap_init_state.patch
mm-zswap-delay-the-initializaton-of-zswap-until-the-first-enablement.patch
mm-zswap-skip-confusing-print-info.patch
mm-thp-simplify-has_transparent_hugepage-by-using-is_builtin.patch
mm-thp-remove-redundant-config_transparent_hugepage.patch
mm-kmemleak-make-create_object-return-void.patch
mm-huge_memory-prevent-thp_zero_page_alloc-increased-twice.patch
mm-memcontrol-use-kstrtobool-for-swapaccount-param-parsing.patch