linux-kernel - Re: [PATCH v2 1/4] mm/damon: introduce DAMON

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Message-Id: <20250604205619.18929-1-sj@kernel.org>
Date: Wed,  4 Jun 2025 13:56:19 -0700
From: SeongJae Park <sj@...nel.org>
To: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v2 1/4] mm/damon: introduce DAMON_STAT module

On Wed,  4 Jun 2025 11:31:24 -0700 SeongJae Park <sj@...nel.org> wrote:

[...]
> --- /dev/null
> +++ b/mm/damon/stat.c
> @@ -0,0 +1,138 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Shows data access monitoring resutls in simple metrics.
> + */
> +
> +#define pr_fmt(fmt) "damon-stat: " fmt
> +
> +#include <linux/damon.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/sort.h>
> +
> +#ifdef MODULE_PARAM_PREFIX
> +#undef MODULE_PARAM_PREFIX
> +#endif
> +#define MODULE_PARAM_PREFIX "damon_stat."
> +
> +static int damon_stat_enabled_store(
> +		const char *val, const struct kernel_param *kp);
> +
> +static const struct kernel_param_ops enabled_param_ops = {
> +	.set = damon_stat_enabled_store,
> +	.get = param_get_bool,
> +};
> +
> +static bool enabled __read_mostly = CONFIG_DAMON_STAT_ENABLED_DEFAULT;

Oops, I forgot using IS_ENABLED() here.  Andrew, could you please add below
fixup?


Thanks,
SJ

===== >8 =====
>From bc2a2c580f6f89f3f7d4f92c2bde3f4a4fac3409 Mon Sep 17 00:00:00 2001
From: SeongJae Park <sj@...nel.org>
Date: Wed, 4 Jun 2025 13:48:30 -0700
Subject: [PATCH] mm/damon/stat: use IS_ENABLED() for enabled initial value
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The initial value of enabled parameter is set as
CONFIG_DAMON_STAT_ENABLED_DEFAULT, so get below build error when the
config is not enabled.  Fix it using IS_ENABLED().

    mm/damon/stat.c:27:37: error: ‘CONFIG_DAMON_STAT_ENABLED_DEFAULT’ undeclared here (not in a function)
       27 | static bool enabled __read_mostly = CONFIG_DAMON_STAT_ENABLED_DEFAULT;
          |                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/stat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/damon/stat.c b/mm/damon/stat.c
index 7ef13ea22221..3686f67befc3 100644
--- a/mm/damon/stat.c
+++ b/mm/damon/stat.c
@@ -24,7 +24,8 @@ static const struct kernel_param_ops enabled_param_ops = {
        .get = param_get_bool,
 };

-static bool enabled __read_mostly = CONFIG_DAMON_STAT_ENABLED_DEFAULT;
+static bool enabled __read_mostly = IS_ENABLED(
+               CONFIG_DAMON_STAT_ENABLED_DEFAULT);
 module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);
 MODULE_PARM_DESC(enabled, "Enable of disable DAMON_STAT");

--
2.39.5