The patch titled
Subject: mm: hugetlb_vmemmap: use kstrtobool for hugetlb_vmemmap param parsing
has been added to the -mm mm-unstable branch. Its filename is
mm-hugetlb_vmemmap-use-kstrtobool-for-hugetlb_vmemmap-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-hugetlb_vmemmap-use-kstrtobool-for-hugetlb_vmemmap-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: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: mm: hugetlb_vmemmap: use kstrtobool for hugetlb_vmemmap param parsing
Use kstrtobool rather than open coding "on" and "off" parsing in
mm/hugetlb_vmemmap.c, 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/20220512041142.39501-4-songmuchun@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Iurii Zaikin <yzaikin@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 6 +++---
mm/hugetlb_vmemmap.c | 10 +++++-----
2 files changed, 8 insertions(+), 8 deletions(-)
--- a/Documentation/admin-guide/kernel-parameters.txt~mm-hugetlb_vmemmap-use-kstrtobool-for-hugetlb_vmemmap-param-parsing
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -1664,10 +1664,10 @@
enabled.
Allows heavy hugetlb users to free up some more
memory (7 * PAGE_SIZE for each 2MB hugetlb page).
- Format: { on | off (default) }
+ Format: { [oO][Nn]/Y/y/1 | [oO][Ff]/N/n/0 (default) }
- on: enable the feature
- off: disable the feature
+ [oO][Nn]/Y/y/1: enable the feature
+ [oO][Ff]/N/n/0: disable the feature
Built with CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON=y,
the default is on.
--- a/mm/hugetlb_vmemmap.c~mm-hugetlb_vmemmap-use-kstrtobool-for-hugetlb_vmemmap-param-parsing
+++ a/mm/hugetlb_vmemmap.c
@@ -28,15 +28,15 @@ EXPORT_SYMBOL(hugetlb_optimize_vmemmap_k
static int __init hugetlb_vmemmap_early_param(char *buf)
{
- if (!buf)
+ bool enable;
+
+ if (kstrtobool(buf, &enable))
return -EINVAL;
- if (!strcmp(buf, "on"))
+ if (enable)
static_branch_enable(&hugetlb_optimize_vmemmap_key);
- else if (!strcmp(buf, "off"))
- static_branch_disable(&hugetlb_optimize_vmemmap_key);
else
- return -EINVAL;
+ static_branch_disable(&hugetlb_optimize_vmemmap_key);
return 0;
}
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-hugetlb_vmemmap-disable-hugetlb_optimize_vmemmap-when-struct-page-crosses-page-boundaries.patch
mm-memory_hotplug-override-memmap_on_memory-when-hugetlb_free_vmemmap=on.patch
mm-hugetlb_vmemmap-use-kstrtobool-for-hugetlb_vmemmap-param-parsing.patch
mm-hugetlb_vmemmap-add-hugetlb_optimize_vmemmap-sysctl.patch
