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mm/damon/dbgfs: remove unnecessary variables

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In some functions, it's unnecessary to declare 'err' and 'ret' variables
at the same time.  This patch mainly to simplify the issue of such
declarations by reusing one variable.

Link: https://lkml.kernel.org/r/20211014073014.35754-1-sj@kernel.org
Signed-off-by: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rongwei Wang 2021-11-05 13:47:09 -07:00 committed by Linus Torvalds
parent 199b50f4c9
commit 9210622ab8
1 changed files with 31 additions and 35 deletions
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66
mm/damon/dbgfs.c
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@ -69,8 +69,7 @@ static ssize_t dbgfs_attrs_write(struct file *file,
struct damon_ctx *ctx = file->private_data;
unsigned long s, a, r, minr, maxr;
char *kbuf;
ssize_t ret = count;
int err;
ssize_t ret;
kbuf = user_input_str(buf, count, ppos);
if (IS_ERR(kbuf))
@ -88,9 +87,9 @@ static ssize_t dbgfs_attrs_write(struct file *file,
goto unlock_out;
}
err = damon_set_attrs(ctx, s, a, r, minr, maxr);
if (err)
ret = err;
ret = damon_set_attrs(ctx, s, a, r, minr, maxr);
if (!ret)
ret = count;
unlock_out:
mutex_unlock(&ctx->kdamond_lock);
out:
@ -220,14 +219,13 @@ static ssize_t dbgfs_schemes_write(struct file *file, const char __user *buf,
struct damon_ctx *ctx = file->private_data;
char *kbuf;
struct damos **schemes;
ssize_t nr_schemes = 0, ret = count;
int err;
ssize_t nr_schemes = 0, ret;
kbuf = user_input_str(buf, count, ppos);
if (IS_ERR(kbuf))
return PTR_ERR(kbuf);
schemes = str_to_schemes(kbuf, ret, &nr_schemes);
schemes = str_to_schemes(kbuf, count, &nr_schemes);
if (!schemes) {
ret = -EINVAL;
goto out;
@ -239,11 +237,12 @@ static ssize_t dbgfs_schemes_write(struct file *file, const char __user *buf,
goto unlock_out;
}
err = damon_set_schemes(ctx, schemes, nr_schemes);
if (err)
ret = err;
else
ret = damon_set_schemes(ctx, schemes, nr_schemes);
if (!ret) {
ret = count;
nr_schemes = 0;
}
unlock_out:
mutex_unlock(&ctx->kdamond_lock);
free_schemes_arr(schemes, nr_schemes);
@ -343,9 +342,8 @@ static ssize_t dbgfs_target_ids_write(struct file *file,
char *kbuf, *nrs;
unsigned long *targets;
ssize_t nr_targets;
ssize_t ret = count;
ssize_t ret;
int i;
int err;
kbuf = user_input_str(buf, count, ppos);
if (IS_ERR(kbuf))
@ -358,7 +356,7 @@ static ssize_t dbgfs_target_ids_write(struct file *file,
scnprintf(kbuf, count, "42 ");
}
targets = str_to_target_ids(nrs, ret, &nr_targets);
targets = str_to_target_ids(nrs, count, &nr_targets);
if (!targets) {
ret = -ENOMEM;
goto out;
@ -393,11 +391,12 @@ static ssize_t dbgfs_target_ids_write(struct file *file,
else
damon_pa_set_primitives(ctx);
err = damon_set_targets(ctx, targets, nr_targets);
if (err) {
ret = damon_set_targets(ctx, targets, nr_targets);
if (ret) {
if (id_is_pid)
dbgfs_put_pids(targets, nr_targets);
ret = err;
} else {
ret = count;
}
unlock_out:
@ -715,8 +714,7 @@ static ssize_t dbgfs_mk_context_write(struct file *file,
{
char *kbuf;
char *ctx_name;
ssize_t ret = count;
int err;
ssize_t ret;
kbuf = user_input_str(buf, count, ppos);
if (IS_ERR(kbuf))
@ -734,9 +732,9 @@ static ssize_t dbgfs_mk_context_write(struct file *file,
}
mutex_lock(&damon_dbgfs_lock);
err = dbgfs_mk_context(ctx_name);
if (err)
ret = err;
ret = dbgfs_mk_context(ctx_name);
if (!ret)
ret = count;
mutex_unlock(&damon_dbgfs_lock);
out:
@ -805,8 +803,7 @@ static ssize_t dbgfs_rm_context_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
char *kbuf;
ssize_t ret = count;
int err;
ssize_t ret;
char *ctx_name;
kbuf = user_input_str(buf, count, ppos);
@ -825,9 +822,9 @@ static ssize_t dbgfs_rm_context_write(struct file *file,
}
mutex_lock(&damon_dbgfs_lock);
err = dbgfs_rm_context(ctx_name);
if (err)
ret = err;
ret = dbgfs_rm_context(ctx_name);
if (!ret)
ret = count;
mutex_unlock(&damon_dbgfs_lock);
out:
@ -851,9 +848,8 @@ static ssize_t dbgfs_monitor_on_read(struct file *file,
static ssize_t dbgfs_monitor_on_write(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
ssize_t ret = count;
ssize_t ret;
char *kbuf;
int err;
kbuf = user_input_str(buf, count, ppos);
if (IS_ERR(kbuf))
@ -866,14 +862,14 @@ static ssize_t dbgfs_monitor_on_write(struct file *file,
}
if (!strncmp(kbuf, "on", count))
err = damon_start(dbgfs_ctxs, dbgfs_nr_ctxs);
ret = damon_start(dbgfs_ctxs, dbgfs_nr_ctxs);
else if (!strncmp(kbuf, "off", count))
err = damon_stop(dbgfs_ctxs, dbgfs_nr_ctxs);
ret = damon_stop(dbgfs_ctxs, dbgfs_nr_ctxs);
else
err = -EINVAL;
ret = -EINVAL;
if (err)
ret = err;
if (!ret)
ret = count;
kfree(kbuf);
return ret;
}