linux-kernel - Re: PROBLEM: 5.9.0-rc6 fails to compile due to 'redefinition of ‘dax

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Date:   Mon, 21 Sep 2020 14:19:48 +0530
From:   Bhaskar Chowdhury <unixbhaskar@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Stuart Little <achirvasub@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux- stable <stable@...r.kernel.org>,
        Adrian Huang <ahuang12@...ovo.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Ira Weiny <ira.weiny@...el.com>, mpatocka@...hat.com,
        lkft-triage@...ts.linaro.org, Jan Kara <jack@...e.cz>
Subject: Re: PROBLEM: 5.9.0-rc6 fails to compile due to 'redefinition of ‘dax_supported’'

On 09:32 Mon 21 Sep 2020, Greg KH wrote:
>On Mon, Sep 21, 2020 at 11:34:17AM +0530, Naresh Kamboju wrote:
>> On Mon, 21 Sep 2020 at 06:34, Stuart Little <achirvasub@...il.com> wrote:
>> >
>> > I am trying to compile for an x86_64 machine (Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz). The config file I am currently using is at
>> >
>> > https://termbin.com/xin7
>> >
>> > The build for 5.9.0-rc6 fails with the following errors:
>> >
>> 
>> arm and mips allmodconfig build breaks due to this error.
>
>all my local builds are breaking now too with this :(
>
>Was there a proposed patch anywhere for this?
>
>thanks,
>
>greg k-h

I don't know Greg,but it builds for me with these config :

bhaskar@...ckware_14:14:31_Mon Sep 21:~> cd /data/linux
✔ /data/linux [master|⚑ 1]
14:14 $ grep DAX .config
CONFIG_NVDIMM_DAX=y
CONFIG_DAX_DRIVER=y
CONFIG_DAX=y
CONFIG_DEV_DAX=m
CONFIG_DEV_DAX_PMEM=m
CONFIG_DEV_DAX_KMEM=m
CONFIG_DEV_DAX_PMEM_COMPAT=m
CONFIG_FS_DAX=y
CONFIG_FS_DAX_PMD=y

and it gets booted by qemu ....like this 

[    5.134563] devtmpfs: mounted
[    5.164729] Freeing unused decrypted memory: 2040K
[    5.314950] Freeing unused kernel image (initmem) memory: 1600K
[    5.316543] Write protecting the kernel read-only data: 26624k
[    5.327037] Freeing unused kernel image (text/rodata gap) memory: 2040K
[    5.331005] Freeing unused kernel image (rodata/data gap) memory: 876K
[    5.331861] rodata_test: all tests were successful
[    5.332872] Run /sbin/init as init process
[    5.694654] EXT4-fs (sda): re-mounted. Opts: (null)
[    5.695839] ext4 filesystem being remounted at / supports timestamps until 2038 (0x7fffffff)
Starting syslogd: OK
Starting klogd: OK
Running sysctl: [    6.974188] random: crng init done
OK
Initializing random number generator: OK
Saving random seed: OK
Starting network: [    8.293018] hrtimer: interrupt took 4569776 ns
OK

Welcome to Buildroot_Linux
Bhaskar_Thinkpad_x250 login: root
# uname -a
Linux Bhaskar_Thinkpad_x250 5.9.0-rc6-Slackware #1 SMP Mon Sep 21 11:42:03 IST 2020 x86_64 GNU/Linux

~Bhaskar

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