linux-kernel - Re: [PATCH 5/9] XArray: entry in last level is not expected to be a node

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Message-ID: <20200330142821.GD22483@bombadil.infradead.org>
Date:   Mon, 30 Mar 2020 07:28:21 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] XArray: entry in last level is not expected to be a
 node

On Mon, Mar 30, 2020 at 02:15:58PM +0000, Wei Yang wrote:
> On Mon, Mar 30, 2020 at 05:48:42AM -0700, Matthew Wilcox wrote:
> >On Mon, Mar 30, 2020 at 12:36:39PM +0000, Wei Yang wrote:
> >> If an entry is at the last level, whose parent's shift is 0, it is not
> >> expected to be a node. We can just leverage the xa_is_node() check to
> >> break the loop instead of check shift additionally.
> >
> >I know you didn't run the test suite after making this change.
> 
> I did kernel build test, but not the test suite as you mentioned.
> 
> Would you mind sharing some steps on using the test suite? And which case you
> think would trigger the problem?

cd tools/testing/radix-tree/; make; ./main

The IDR tests are the ones which are going to trigger on this.