mm/damon/sysfs: change few functions execute order

There's no need to run container_of() as early as we do.

The compiler figures this out, but the resulting code is more readable.

Link: https://lkml.kernel.org/r/20220908081932.77370-1-xhao@linux.alibaba.com
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 9fcf7ba..d27dad5 100644 (file)
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1031,8 +1031,7 @@ static ssize_t nr_schemes_show(struct kobject *kobj,
 static ssize_t nr_schemes_store(struct kobject *kobj,
                struct kobj_attribute *attr, const char *buf, size_t count)
 {
-       struct damon_sysfs_schemes *schemes = container_of(kobj,
-                       struct damon_sysfs_schemes, kobj);
+       struct damon_sysfs_schemes *schemes;
        int nr, err = kstrtoint(buf, 0, &nr);
 
        if (err)
@@ -1040,6 +1039,8 @@ static ssize_t nr_schemes_store(struct kobject *kobj,
        if (nr < 0)
                return -EINVAL;
 
+       schemes = container_of(kobj, struct damon_sysfs_schemes, kobj);
+
        if (!mutex_trylock(&damon_sysfs_lock))
                return -EBUSY;
        err = damon_sysfs_schemes_add_dirs(schemes, nr);
@@ -1237,8 +1238,7 @@ static ssize_t nr_regions_show(struct kobject *kobj,
 static ssize_t nr_regions_store(struct kobject *kobj,
                struct kobj_attribute *attr, const char *buf, size_t count)
 {
-       struct damon_sysfs_regions *regions = container_of(kobj,
-                       struct damon_sysfs_regions, kobj);
+       struct damon_sysfs_regions *regions;
        int nr, err = kstrtoint(buf, 0, &nr);
 
        if (err)
@@ -1246,6 +1246,8 @@ static ssize_t nr_regions_store(struct kobject *kobj,
        if (nr < 0)
                return -EINVAL;
 
+       regions = container_of(kobj, struct damon_sysfs_regions, kobj);
+
        if (!mutex_trylock(&damon_sysfs_lock))
                return -EBUSY;
        err = damon_sysfs_regions_add_dirs(regions, nr);
@@ -1440,8 +1442,7 @@ static ssize_t nr_targets_show(struct kobject *kobj,
 static ssize_t nr_targets_store(struct kobject *kobj,
                struct kobj_attribute *attr, const char *buf, size_t count)
 {
-       struct damon_sysfs_targets *targets = container_of(kobj,
-                       struct damon_sysfs_targets, kobj);
+       struct damon_sysfs_targets *targets;
        int nr, err = kstrtoint(buf, 0, &nr);
 
        if (err)
@@ -1449,6 +1450,8 @@ static ssize_t nr_targets_store(struct kobject *kobj,
        if (nr < 0)
                return -EINVAL;
 
+       targets = container_of(kobj, struct damon_sysfs_targets, kobj);
+
        if (!mutex_trylock(&damon_sysfs_lock))
                return -EBUSY;
        err = damon_sysfs_targets_add_dirs(targets, nr);
@@ -1962,8 +1965,7 @@ static ssize_t nr_contexts_show(struct kobject *kobj,
 static ssize_t nr_contexts_store(struct kobject *kobj,
                struct kobj_attribute *attr, const char *buf, size_t count)
 {
-       struct damon_sysfs_contexts *contexts = container_of(kobj,
-                       struct damon_sysfs_contexts, kobj);
+       struct damon_sysfs_contexts *contexts;
        int nr, err;
 
        err = kstrtoint(buf, 0, &nr);
@@ -1973,6 +1975,7 @@ static ssize_t nr_contexts_store(struct kobject *kobj,
        if (nr < 0 || 1 < nr)
                return -EINVAL;
 
+       contexts = container_of(kobj, struct damon_sysfs_contexts, kobj);
        if (!mutex_trylock(&damon_sysfs_lock))
                return -EBUSY;
        err = damon_sysfs_contexts_add_dirs(contexts, nr);
@@ -2737,8 +2740,7 @@ static ssize_t nr_kdamonds_show(struct kobject *kobj,
 static ssize_t nr_kdamonds_store(struct kobject *kobj,
                struct kobj_attribute *attr, const char *buf, size_t count)
 {
-       struct damon_sysfs_kdamonds *kdamonds = container_of(kobj,
-                       struct damon_sysfs_kdamonds, kobj);
+       struct damon_sysfs_kdamonds *kdamonds;
        int nr, err;
 
        err = kstrtoint(buf, 0, &nr);
@@ -2747,6 +2749,8 @@ static ssize_t nr_kdamonds_store(struct kobject *kobj,
        if (nr < 0)
                return -EINVAL;
 
+       kdamonds = container_of(kobj, struct damon_sysfs_kdamonds, kobj);
+
        if (!mutex_trylock(&damon_sysfs_lock))
                return -EBUSY;
        err = damon_sysfs_kdamonds_add_dirs(kdamonds, nr);