linux-kernel - Re: [PATCH V1 1/2] mm/damon/dbgfs: Modify Damon dbfs interface dependency in Kconfig

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Date:   Sun, 21 Nov 2021 11:24:17 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Xin Hao <xhao@...ux.alibaba.com>
Cc:     sj@...nel.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 1/2] mm/damon/dbgfs: Modify Damon dbfs interface dependency in Kconfig

Hi Xin,

On Sun, 21 Nov 2021 01:27:53 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:

> If you want to support "DAMON_DBGFS" in config file, it only depends on
> any one of "DAMON_VADDR" and "DAMON_PADDR".

This is not true.  DAMON_DBGFS really depends on both.

This patch even makes the build fails with some configs.

      CC      mm/damon/dbgfs.o
    linux/mm/damon/dbgfs.c: In function ‘dbgfs_target_ids_write’:
    linux/mm/damon/dbgfs.c:409:3: error: implicit declaration of function ‘damon_pa_set_primitives’; did you mean ‘damon_va_set_primitives’? [-Werror=implicit-function-declaration]
       damon_pa_set_primitives(ctx);
       ^~~~~~~~~~~~~~~~~~~~~~~
       damon_va_set_primitives
    cc1: some warnings being treated as errors


Thanks,
SJ

> 
> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
> ---
>  mm/damon/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/Kconfig b/mm/damon/Kconfig
> index 5bcf05851ad0..971ffc496596 100644
> --- a/mm/damon/Kconfig
> +++ b/mm/damon/Kconfig
> @@ -54,7 +54,7 @@ config DAMON_VADDR_KUNIT_TEST
>  
>  config DAMON_DBGFS
>  	bool "DAMON debugfs interface"
> -	depends on DAMON_VADDR && DAMON_PADDR && DEBUG_FS
> +	depends on DAMON_VADDR || DAMON_PADDR && DEBUG_FS
>  	help
>  	  This builds the debugfs interface for DAMON.  The user space admins
>  	  can use the interface for arbitrary data access monitoring.
> -- 
> 2.31.0
> 
>