linux-kernel - [PATCH 5/8] mm/damon/dbgfs: Use damon_select_ops() instead of damon_{v,p}a_set

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Date:   Tue, 15 Feb 2022 18:46:00 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     xhao@...ux.alibaba.com, rientjes@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH 5/8] mm/damon/dbgfs: Use damon_select_ops() instead of damon_{v,p}a_set_operations()

This commit makes DAMON debugfs interface to select the registered
monitoring operations for the physical address space or virtual address
spaces depending on user requests instead of setting it on its own.
Note that DAMON debugfs interface is still dependent to DAMON_VADDR with
this change, because it is also using its symbol,
'damon_va_target_valid'.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/dbgfs.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 719278a8cc5e..8bf9e38b60f4 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -474,12 +474,18 @@ static ssize_t dbgfs_target_ids_write(struct file *file,
 
 	/* remove previously set targets */
 	dbgfs_set_targets(ctx, 0, NULL);
+	if (!nr_targets) {
+		ret = count;
+		goto unlock_out;
+	}
 
 	/* Configure the context for the address space type */
 	if (id_is_pid)
-		damon_va_set_operations(ctx);
+		ret = damon_select_ops(ctx, DAMON_OPS_VADDR);
 	else
-		damon_pa_set_operations(ctx);
+		ret = damon_select_ops(ctx, DAMON_OPS_PADDR);
+	if (ret)
+		goto unlock_out;
 
 	ret = dbgfs_set_targets(ctx, nr_targets, target_pids);
 	if (!ret)
@@ -735,7 +741,11 @@ static struct damon_ctx *dbgfs_new_ctx(void)
 	if (!ctx)
 		return NULL;
 
-	damon_va_set_operations(ctx);
+	if (damon_select_ops(ctx, DAMON_OPS_VADDR) && damon_select_ops(ctx,
+				DAMON_OPS_PADDR)) {
+		damon_destroy_ctx(ctx);
+		return NULL;
+	}
 	ctx->callback.before_terminate = dbgfs_before_terminate;
 	return ctx;
 }
-- 
2.17.1