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 21:19:57 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     SeongJae Park <sj@...nel.org>
Cc:     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 Park,

On 11/21/21 7:24 PM, SeongJae Park wrote:
> 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

That is my fault,  i have found a solution, and i will send a v2 patch 
to solve it,  i I think DAMON_VADDR and DAMON_PADDR

must be decoupled，the kconfig must support it, becasue sometimes i don't 
want to use damon paddr function, just only need to include

DAMON_VADDR, therefore, it is not necessary to include damon/paddr.c 
during compile time.

>
>
> 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
>>
>>
-- 
Best Regards!
Xin Hao