linux-kernel - Re: [PATCH] staging: exfat: add exfat filesystem code to staging

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Date:   Fri, 30 Aug 2019 11:34:45 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Gao Xiang <gaoxiang25@...wei.com>
Cc:     devel@...verdev.osuosl.org, Christoph Hellwig <hch@...radead.org>,
        Valdis Klētnieks <valdis.kletnieks@...edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Sasha Levin <alexander.levin@...rosoft.com>,
        linux-fsdevel@...r.kernel.org,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [PATCH] staging: exfat: add exfat filesystem code to staging

On Fri, Aug 30, 2019 at 12:04:41AM +0800, Gao Xiang wrote:
> Anyway, I'm fine to delete them all if you like, but I think majority of these
> are meaningful.
> 
> data.c-		/* page is already locked */
> data.c-		DBG_BUGON(PageUptodate(page));
> data.c-
> data.c:		if (unlikely(err))
> data.c-			SetPageError(page);
> data.c-		else
> data.c-			SetPageUptodate(page);

If we cared about speed here then we would delete the DBG_BUGON() check
because that's going to be expensive.  The likely/unlikely annotations
should be used in places a reasonable person thinks it will make a
difference to benchmarks.

regards,
dan carpenter