linux-kernel - Re: [PATCH 4/4] staging: lustre: obdclass: change object lookup to no wait mode

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Message-ID: <20180508114500.qrtnjax4siupgv3n@mwanda>
Date:   Tue, 8 May 2018 14:45:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     James Simmons <jsimmons@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Lai Siyao <lai.siyao@...el.com>,
        Jinshan Xiong <jinshan.xiong@...el.com>,
        NeilBrown <neilb@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 4/4] staging: lustre: obdclass: change object lookup to
 no wait mode

>  	/*
>  	 * Allocate new object. This may result in rather complicated
>  	 * operations, including fld queries, inode loading, etc.
>  	 */
>  	o = lu_object_alloc(env, dev, f, conf);
> -	if (IS_ERR(o))
> +	if (unlikely(IS_ERR(o)))
>  		return o;
>  

This is an unrelated and totally pointless.  likely/unlikely annotations
hurt readability, and they should only be added if it's something which
is going to show up in benchmarking.  lu_object_alloc() is already too
slow for the unlikely() to make a difference and anyway IS_ERR() has an
unlikely built in so it's duplicative...

Anyway, I understand that Intel has been ignoring kernel.org instead of
sending forwarding their patches properly so you're doing a difficult
and thankless job...  Thanks for that.  I'm sure it's frustrating to
look at these patches for you as well.

regards,
dan carpenter