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mm/damon/sysfs: use damon_kdamond_pid()

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DAMON sysfs interface directly uses damon_ctx->kdamond field with manual
synchronization using damon_ctx->kdamond_lock, to get the pid of the
kdamond.  Use a new dedicated function for the purpose, namely
damon_kdamond_pid(), since that doesn't require manual and error-prone
synchronization.

Avoid use of kdamond_lock outside of the core.

Link: https://lkml.kernel.org/r/20260115152047.68415-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-01-15 07:20:42 -08:00 committed by Andrew Morton
parent 4262c53236
commit f54b51ce31
1 changed files with 3 additions and 4 deletions
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7
mm/damon/sysfs.c
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@ -1819,10 +1819,9 @@ static ssize_t pid_show(struct kobject *kobj,
if (!ctx)
goto out;
mutex_lock(&ctx->kdamond_lock);
if (ctx->kdamond)
pid = ctx->kdamond->pid;
mutex_unlock(&ctx->kdamond_lock);
pid = damon_kdamond_pid(ctx);
if (pid < 0)
pid = -1;
out:
mutex_unlock(&damon_sysfs_lock);
return sysfs_emit(buf, "%d\n", pid);