From: Jagdish Gediya <jvgediya@linux.ibm.com>
Subject: mm: convert sysfs input to bool using kstrtobool()

Sysfs input conversion to corrosponding bool value e.g.  "false" or "0" to
false, "true" or "1" to true are currently handled through strncmp at
multiple places.  Use kstrtobool() to convert sysfs input to bool value.

Link: https://lkml.kernel.org/r/20220426180203.70782-2-jvgediya@linux.ibm.com
Signed-off-by: Jagdish Gediya <jvgediya@linux.ibm.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/migrate.c    |    6 +-----
 mm/swap_state.c |    6 +-----
 2 files changed, 2 insertions(+), 10 deletions(-)

--- a/mm/migrate.c~mm-convert-sysfs-input-to-bool-using-kstrtobool
+++ a/mm/migrate.c
@@ -2534,11 +2534,7 @@ static ssize_t numa_demotion_enabled_sto
 					   struct kobj_attribute *attr,
 					   const char *buf, size_t count)
 {
-	if (!strncmp(buf, "true", 4) || !strncmp(buf, "1", 1))
-		numa_demotion_enabled = true;
-	else if (!strncmp(buf, "false", 5) || !strncmp(buf, "0", 1))
-		numa_demotion_enabled = false;
-	else
+	if (kstrtobool(buf, &numa_demotion_enabled))
 		return -EINVAL;
 
 	return count;
--- a/mm/swap_state.c~mm-convert-sysfs-input-to-bool-using-kstrtobool
+++ a/mm/swap_state.c
@@ -874,11 +874,7 @@ static ssize_t vma_ra_enabled_store(stru
 				      struct kobj_attribute *attr,
 				      const char *buf, size_t count)
 {
-	if (!strncmp(buf, "true", 4) || !strncmp(buf, "1", 1))
-		enable_vma_readahead = true;
-	else if (!strncmp(buf, "false", 5) || !strncmp(buf, "0", 1))
-		enable_vma_readahead = false;
-	else
+	if (kstrtobool(buf, &enable_vma_readahead))
 		return -EINVAL;
 
 	return count;
_