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Subject: Re: [PATCH] buffer: remove useless comment and
 WB_REASON_FREE_MORE_MEM, reason.
To:     Jan Kara <jack@suse.cz>
CC:     <viro@zeniv.linux.org.uk>, <rostedt@goodmis.org>,
        <mingo@redhat.com>, "Jens Axboe" <axboe@kernel.dk>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        <linux-fsdevel@vger.kernel.org>, <tj@kernel.org>,
        <bigeasy@linutronix.de>, linfeilong <linfeilong@huawei.com>,
        Yanxiaodan <yanxiaodan@huawei.com>,
        Mingfangsen <mingfangsen@huawei.com>,
        renxudong <renxudong1@huawei.com>
References: <5844aa66-de1e-278b-5491-b7e6839640e9@huawei.com>
 <20200414150929.GD28226@quack2.suse.cz>
From:   Zhiqiang Liu <liuzhiqiang26@huawei.com>
Message-ID: <81bf1cd4-0319-bc62-dbdf-701d39edd23a@huawei.com>
Date:   Sat, 18 Apr 2020 09:01:03 +0800
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friendly ping...

On 2020/4/14 23:09, Jan Kara wrote:
> On Mon 13-04-20 13:12:10, Zhiqiang Liu wrote:
>> From: Zhiqiang Liu <liuzhiqiang26@huawei.com>
>>
>> free_more_memory func has been completely removed in commit bc48f001de12
>> ("buffer: eliminate the need to call free_more_memory() in __getblk_slow()")
>>
>> So comment and `WB_REASON_FREE_MORE_MEM` reason about free_more_memory
>> are no longer needed.
>>
>> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
> 
> Thanks. The patch looks good to me. You can add:
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> 
> 								Honza
> 
>> ---
>>  fs/buffer.c                      | 2 +-
>>  include/linux/backing-dev-defs.h | 1 -
>>  include/trace/events/writeback.h | 1 -
>>  3 files changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/fs/buffer.c b/fs/buffer.c
>> index b8d28370cfd7..07ab0405f3f5 100644
>> --- a/fs/buffer.c
>> +++ b/fs/buffer.c
>> @@ -973,7 +973,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
>>  	struct page *page;
>>  	struct buffer_head *bh;
>>  	sector_t end_block;
>> -	int ret = 0;		/* Will call free_more_memory() */
>> +	int ret = 0;
>>  	gfp_t gfp_mask;
>>
>>  	gfp_mask = mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS) | gfp;
>> diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
>> index 4fc87dee005a..ee577a83cfe6 100644
>> --- a/include/linux/backing-dev-defs.h
>> +++ b/include/linux/backing-dev-defs.h
>> @@ -54,7 +54,6 @@ enum wb_reason {
>>  	WB_REASON_SYNC,
>>  	WB_REASON_PERIODIC,
>>  	WB_REASON_LAPTOP_TIMER,
>> -	WB_REASON_FREE_MORE_MEM,
>>  	WB_REASON_FS_FREE_SPACE,
>>  	/*
>>  	 * There is no bdi forker thread any more and works are done
>> diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
>> index d94def25e4dc..85a33bea76f1 100644
>> --- a/include/trace/events/writeback.h
>> +++ b/include/trace/events/writeback.h
>> @@ -36,7 +36,6 @@
>>  	EM( WB_REASON_SYNC,			"sync")			\
>>  	EM( WB_REASON_PERIODIC,			"periodic")		\
>>  	EM( WB_REASON_LAPTOP_TIMER,		"laptop_timer")		\
>> -	EM( WB_REASON_FREE_MORE_MEM,		"free_more_memory")	\
>>  	EM( WB_REASON_FS_FREE_SPACE,		"fs_free_space")	\
>>  	EMe(WB_REASON_FORKER_THREAD,		"forker_thread")
>>
>> -- 
>> 2.19.1
>>
>>