+ mm-damon-sysfs-simplify-the-variable-pid-assignment-operation.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/damon/sysfs: simplify the variable 'pid' assignment operation
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-sysfs-simplify-the-variable-pid-assignment-operation.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-simplify-the-variable-pid-assignment-operation.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kaixu Xia <kaixuxia@tencent.com>
Subject: mm/damon/sysfs: simplify the variable 'pid' assignment operation
Date: Tue, 13 Sep 2022 17:11:25 +0800

We can initialize the variable 'pid' with '-1' in pid_show() to simplify
the variable assignment operation and make the code more readable.

Link: https://lkml.kernel.org/r/1663060287-30201-3-git-send-email-kaixuxia@tencent.com
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/mm/damon/sysfs.c~mm-damon-sysfs-simplify-the-variable-pid-assignment-operation
+++ a/mm/damon/sysfs.c
@@ -2592,19 +2592,16 @@ static ssize_t pid_show(struct kobject *
 	struct damon_sysfs_kdamond *kdamond = container_of(kobj,
 			struct damon_sysfs_kdamond, kobj);
 	struct damon_ctx *ctx;
-	int pid;
+	int pid = -1;
 
 	if (!mutex_trylock(&damon_sysfs_lock))
 		return -EBUSY;
 	ctx = kdamond->damon_ctx;
-	if (!ctx) {
-		pid = -1;
+	if (!ctx)
 		goto out;
-	}
+
 	mutex_lock(&ctx->kdamond_lock);
-	if (!ctx->kdamond)
-		pid = -1;
-	else
+	if (ctx->kdamond)
 		pid = ctx->kdamond->pid;
 	mutex_unlock(&ctx->kdamond_lock);
 out:
_

Patches currently in -mm which might be from kaixuxia@tencent.com are

mm-damon-sysfs-simplify-the-judgement-whether-kdamonds-are-busy.patch
mm-damon-core-iterate-the-regions-list-from-current-point-in-damon_set_regions.patch
mm-damon-vaddr-add-a-comment-for-default-case-in-damon_va_apply_scheme.patch
mm-damon-sysfs-use-the-wrapper-directly-to-check-if-the-kdamond-is-running.patch
mm-damon-simplify-the-parameter-passing-for-prepare_access_checks.patch
mm-damon-sysfs-simplify-the-variable-pid-assignment-operation.patch
mm-damon-core-simplify-the-kdamond-stop-mechanism-by-removing-done.patch
mm-damon-vaddr-indicate-the-target-is-invalid-when-nr_regions-is-zero.patch