linux-kernel - Re: [PATCH 1/1] block/bio.c: use GFP

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Message-ID: <539F0964.5070002@kernel.dk>
Date:	Mon, 16 Jun 2014 09:12:36 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Hugh Dickins <hughd@...gle.com>, Fabian Frederick <fabf@...net.be>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] block/bio.c: use GFP_NOFS

On 2014-06-15 18:28, Hugh Dickins wrote:
> On Sat, 14 Jun 2014, Fabian Frederick wrote:
>
>> Use GFP_NOFS instead of its definition.
>>
>> Cc: Jens Axboe <axboe@...nel.dk>
>> Signed-off-by: Fabian Frederick <fabf@...net.be>
>> ---
>>   block/bio.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/block/bio.c b/block/bio.c
>> index 8c2e55e..ec5d172 100644
>> --- a/block/bio.c
>> +++ b/block/bio.c
>> @@ -211,7 +211,7 @@ fallback:
>>   		bvl = mempool_alloc(pool, gfp_mask);
>>   	} else {
>>   		struct biovec_slab *bvs = bvec_slabs + *idx;
>> -		gfp_t __gfp_mask = gfp_mask & ~(__GFP_WAIT | __GFP_IO);
>> +		gfp_t __gfp_mask = gfp_mask & ~GFP_NOFS;
>>
>>   		/*
>>   		 * Make this allocation restricted and don't dump info on
>> --
>> 1.8.4.5
>
> Please no.  The original was fine, this just makes it harder to read.

I agree. GFP_NOFS is useful when it's used as a whole, but for this use 
case, explicitly saying that we want to wait for mem and we allow IO is 
much clearer. The fact that this just happens to be GFP_NOFS doesn't 
really matter.

> (But I confess to hypocrisy in finding "& ~GFP_KERNEL" useful myself
> in the past somewhere.)

That's just sick, Hugh :-)

-- 
Jens Axboe

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