linux-kernel - Re: [PATCH] elevator: do not request

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Message-ID: <1b4889f3-3140-4855-8c74-f0c9df7318ca@kernel.dk>
Date: Fri, 11 Oct 2024 07:12:43 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Christoph Hellwig <hch@...radead.org>, Breno Leitao <leitao@...ian.org>
Cc: kernel-team@...a.com, "open list:BLOCK LAYER"
 <linux-block@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] elevator: do not request_module if elevator exists

On 10/11/24 2:24 AM, Christoph Hellwig wrote:
>> diff --git a/block/elevator.c b/block/elevator.c
>> index 4122026b11f1..1904e217505a 100644
>> --- a/block/elevator.c
>> +++ b/block/elevator.c
>> @@ -709,13 +709,16 @@ int elv_iosched_load_module(struct gendisk *disk, const char *buf,
>>  			    size_t count)
>>  {
>>  	char elevator_name[ELV_NAME_MAX];
>> +	const char *name;
>>  
>>  	if (!elv_support_iosched(disk->queue))
>>  		return -EOPNOTSUPP;
>>  
>>  	strscpy(elevator_name, buf, sizeof(elevator_name));
>> +	name = strstrip(elevator_name);
>>  
>> -	request_module("%s-iosched", strstrip(elevator_name));
>> +	if (!__elevator_find(name))
> 
> __elevator_find needs to be called with elv_list_lock.

Doh yes. Breno, I just dropped it for now, just send a v2.

-- 
Jens Axboe