linux-kernel - Re: [PATCH 3/5] btrfs: Use radix_tree_iter

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Message-ID: <20160201143432.GH31992@twin.jikos.cz>
Date:	Mon, 1 Feb 2016 15:34:32 +0100
From:	David Sterba <dsterba@...e.cz>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/5] btrfs: Use radix_tree_iter_retry()

On Wed, Jan 27, 2016 at 04:17:50PM -0500, Matthew Wilcox wrote:
> From: Matthew Wilcox <willy@...ux.intel.com>
> 
> Even though this is a 'can't happen' situation, use the new
> radix_tree_iter_retry() pattern to eliminate a goto.

Andrew's tree contains a fixup for a build failure

> @@ -147,7 +146,7 @@ restart:
>  		/* Shouldn't happen but that kind of thinking creates CVE's */
>  		if (radix_tree_exception(eb)) {
>  			if (radix_tree_deref_retry(eb))
> -				goto restart;
> +				slot = radix_tree_iter_retry(iter);

				slot = radix_tree_iter_retry(&iter);

http://ozlabs.org/~akpm/mmots/broken-out/btrfs-use-radix_tree_iter_retry-fix.patch