Re: [PATCH] bio: skip atomic inc/dec of ->bi_remaining for non-chains

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On Fri 17-04-15 08:59:33, Jens Axboe wrote:
> @@ -292,8 +292,8 @@ void bio_reset(struct bio *bio)
>  	__bio_free(bio);
>  
>  	memset(bio, 0, BIO_RESET_BYTES);
> -	bio->bi_flags = flags|(1 << BIO_UPTODATE);
> -	atomic_set(&bio->bi_remaining, 1);
> +	bio->bi_flags = flags | 1 << BIO_UPTODATE;
  Although this is correct, I'd prefer to keep parenthesis around 1 <<
BIO_UPTODATE. Maybe I'm not a real C hacker but I had to lookup the
operator precedence of | vs << :).

Otherwise the patch looks good to me (but I'm not an expert in this area, I
just looked into the patch by accident because I thought it's another
respin of your direct IO patch ;).

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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