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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@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song 2022-05-13 16:48:56 -07:00 committed by Andrew Morton
parent 6e02c46b4d
commit 9c54c522bb
2 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -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.

10
mm/hugetlb_vmemmap.c
View File

@ -28,15 +28,15 @@ EXPORT_SYMBOL(hugetlb_optimize_vmemmap_key);
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;
}