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.

[akpm@linux-foundation.org: propagate kstrtobool() return value, per Andy]
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>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.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>

diff --git a/mm/migrate.c b/mm/migrate.c
index b267827..ab46ad9 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2523,12 +2523,11 @@ static ssize_t numa_demotion_enabled_store(struct kobject *kobj,
                                           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
-               return -EINVAL;
+       ssize_t ret;
+
+       ret = kstrtobool(buf, &numa_demotion_enabled);
+       if (ret)
+               return ret;
 
        return count;
 }

diff --git a/mm/swap_state.c b/mm/swap_state.c
index d41746a..27c4e28 100644 (file)
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -874,12 +874,11 @@ static ssize_t vma_ra_enabled_store(struct kobject *kobj,
                                      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
-               return -EINVAL;
+       ssize_t ret;
+
+       ret = kstrtobool(buf, &enable_vma_readahead);
+       if (ret)
+               return ret;
 
        return count;
 }