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From:   SeongJae Park <sj@kernel.org>
To:     akpm@linux-foundation.org
Cc:     corbet@lwn.net, skhan@linuxfoundation.org, rientjes@google.com,
        xhao@linux.alibaba.com, gregkh@linuxfoundation.org,
        linux-damon@amazon.com, linux-mm@kvack.org,
        linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org, SeongJae Park <sj@kernel.org>
Subject: [PATCH v3 02/13] mm/damon/core: Add number of each enum type values
Date:   Mon, 28 Feb 2022 08:13:03 +0000
Message-Id: <20220228081314.5770-3-sj@kernel.org>
In-Reply-To: <20220228081314.5770-1-sj@kernel.org>
References: <20220228081314.5770-1-sj@kernel.org>
Precedence: bulk

This commit declares the number of legal values for each DAMON enum
types to make traversals of such DAMON enum types easy and safe.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 include/linux/damon.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index f8e99e47d747..f23cbfa4248d 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -87,6 +87,7 @@ struct damon_target {
  * @DAMOS_HUGEPAGE:	Call ``madvise()`` for the region with MADV_HUGEPAGE.
  * @DAMOS_NOHUGEPAGE:	Call ``madvise()`` for the region with MADV_NOHUGEPAGE.
  * @DAMOS_STAT:		Do nothing but count the stat.
+ * @NR_DAMOS_ACTIONS:	Total number of DAMOS actions
  */
 enum damos_action {
 	DAMOS_WILLNEED,
@@ -95,6 +96,7 @@ enum damos_action {
 	DAMOS_HUGEPAGE,
 	DAMOS_NOHUGEPAGE,
 	DAMOS_STAT,		/* Do nothing but only record the stat */
+	NR_DAMOS_ACTIONS,
 };
 
 /**
@@ -157,10 +159,12 @@ struct damos_quota {
  *
  * @DAMOS_WMARK_NONE:		Ignore the watermarks of the given scheme.
  * @DAMOS_WMARK_FREE_MEM_RATE:	Free memory rate of the system in [0,1000].
+ * @NR_DAMOS_WMARK_METRICS:	Total number of DAMOS watermark metrics
  */
 enum damos_wmark_metric {
 	DAMOS_WMARK_NONE,
 	DAMOS_WMARK_FREE_MEM_RATE,
+	NR_DAMOS_WMARK_METRICS,
 };
 
 /**
-- 
2.17.1