+ mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch added to -mm tree

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

The patch titled
     Subject: mm/damon/dbgfs: use damon_select_ops() instead of damon_{v,p}a_set_operations()
has been added to the -mm tree.  Its filename is
     mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: 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'.

Link: https://lkml.kernel.org/r/20220215184603.1479-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/dbgfs.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

--- a/mm/damon/dbgfs.c~mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations
+++ a/mm/damon/dbgfs.c
@@ -474,12 +474,18 @@ static ssize_t dbgfs_target_ids_write(st
 
 	/* 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(v
 	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;
 }
_

Patches currently in -mm which might be from sj@kernel.org are

mm-munlock-mlock_page-munlock_page-batch-by-pagevec-fix-2.patch
mm-damon-dbgfs-init_regions-use-target-index-instead-of-target-id.patch
docs-admin-guide-mm-damon-usage-update-for-changed-initail_regions-file-input.patch
mm-damon-core-move-damon_set_targets-into-dbgfs.patch
mm-damon-remove-the-target-id-concept.patch
mm-damon-rename-damon_primitives-to-damon_operations.patch
mm-damon-let-monitoring-operations-can-be-registered-and-selected.patch
mm-damon-paddrvaddr-register-themselves-to-damon-in-subsys_initcall.patch
mm-damon-reclaim-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch
mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch
mm-damon-dbgfs-use-operations-id-for-knowing-if-the-target-has-pid.patch
mm-damon-dbgfs-test-fix-is_target_id-change.patch
mm-damon-paddrvaddr-remove-damon_pva_target_validset_operations.patch