From: Xin Hao <xhao@linux.alibaba.com>
To: sj@kernel.org
Cc: akpm@linux-foundation.org, damon@lists.linux.dev,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
xhao@linux.alibaba.com
Subject: [PATCH] mm/damon/sysfs: change few functions execute order
Date: Thu, 8 Sep 2022 16:19:32 +0800 [thread overview]
Message-ID: <20220908081932.77370-1-xhao@linux.alibaba.com> (raw)
These nr_{schemes,regions,contexts,kdamonds}_store() functions are both call
kstrtoint() to get relative values from sysfs interface, if it return an
error, there get kobject instance would be meaningless through 'container_of'.
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
---
mm/damon/sysfs.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 88f208ff235d..54fdfcdbb3e4 100644
--- 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);
@@ -2741,8 +2744,7 @@ 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);
@@ -2751,6 +2753,8 @@ 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);
--
2.31.0
next reply other threads:[~2022-09-08 8:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 8:19 Xin Hao [this message]
2022-09-08 18:49 ` [PATCH] mm/damon/sysfs: change few functions execute order SeongJae Park
2022-09-08 22:10 ` Andrew Morton
2022-09-08 22:16 ` SeongJae Park
2022-09-09 22:44 ` Andrew Morton
2022-09-09 23:00 ` SeongJae Park
2022-09-10 1:04 ` haoxin
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