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

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Date:   Tue, 31 Mar 2020 22:04:40 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Wei Yang <richard.weiyang@...il.com>,
        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 Tue, Mar 31, 2020 at 09:42:12AM -0700, Matthew Wilcox wrote:
>On Tue, Mar 31, 2020 at 01:42:08PM +0000, Wei Yang wrote:
>> On Mon, Mar 30, 2020 at 07:28:21AM -0700, Matthew Wilcox wrote:
>> >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
>> >
>> 
>> Hmm... I did a make on top of 5.6-rc6, it failed. Would you mind taking a look
>> into this?
>
>It works for me.  I run it almost every day.  What error did you see?


The error message:

cc -I. -I../../include -g -Og -Wall -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined   -c -o main.o main.c
In file included from ./linux/../../../../include/linux/radix-tree.h:15,
                 from ./linux/radix-tree.h:5,
                 from main.c:10:
./linux/rcupdate.h:5:10: fatal error: urcu.h: No such file or directory
    5 | #include <urcu.h>
      |          ^~~~~~~~
compilation terminated.
make: *** [<builtin>: main.o] Error 1


I didn't touch any code in testing directory.

-- 
Wei Yang
Help you, Help me