linux-ext4 - Re: [PATCH v2 2/3] ext4: fix races between changing inode journal mode and ext4

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Message-id: <199292570.46101456881693870.JavaMail.weblogic@ep2mlwas09c>
Date:	Wed, 02 Mar 2016 01:21:35 +0000 (GMT)
From:	Daeho Jeong <daeho.jeong@...sung.com>
To:	kbuild test robot <lkp@...el.com>, "tytso@....edu" <tytso@....edu>,
	"jack@...e.cz" <jack@...e.cz>
Cc:	"kbuild-all@...org" <kbuild-all@...org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	daeho.jeong@...sung.com
Subject: Re: [PATCH v2 2/3] ext4: fix races between changing inode journal mode
 and ext4_writepages

Oops, This build error log is genereated when building ext4 filesystem as a module and
this is originated from that "percpu_free_rwsem()" function was not defined as an exported
function.

Could I define the "percpu_free_rwsem()" function as an exported function directly in this patch?
Or do I have to request the maintainer of percpu_rwsem to do this?

Thank you in advance. :-)

> url:    https://github.com/0day-ci/linux/commits/Daeho-Jeong/ext4-handle-unwritten-or-delalloc-buffers-before-enabling-per-file-dat> a-journaling/20160229-075117
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
> config: x86_64-randconfig-s2-02290828 (attached as .config)
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 

> All errors (new ones prefixed by >>):

> >> ERROR: "percpu_free_rwsem" [fs/ext4/ext4.ko] undefined!