mm/damon/reclaim: use damon_kdamond_pid()

DAMON_RECLAIM 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.

Link: https://lkml.kernel.org/r/20260115152047.68415-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 8463a5a5032f2c9a00d033401ddeb53f2ede4a6d..55df43e241c5d1a87bf0f4249dcf2d0435f47e0a 100644 (file)
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -307,7 +307,9 @@ static int damon_reclaim_turn(bool on)
        err = damon_start(&ctx, 1, true);
        if (err)
                return err;
-       kdamond_pid = ctx->kdamond->pid;
+       kdamond_pid = damon_kdamond_pid(ctx);
+       if (kdamond_pid < 0)
+               return kdamond_pid;
        return damon_call(ctx, &call_control);
 }