linux-ext4 - Re: [PATCH, RFC -V2 1/4] ext4: Add configurable run-time mballoc debugging

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Date:	Tue, 11 Aug 2009 14:53:57 -0400
From:	Theodore Tso <tytso@....edu>
To:	Xiang Wang <xiangw@...gle.com>
Cc:	linux-ext4@...r.kernel.org, Andreas Dilger <adilger@....com>,
	Alex Tomas <bzzz@....com>, Curt Wohlgemuth <curtw@...gle.com>
Subject: Re: [PATCH, RFC -V2 1/4] ext4: Add configurable run-time mballoc
	debugging

On Tue, Aug 11, 2009 at 11:15:53AM -0700, Xiang Wang wrote:
> Hi Ted,
> 
> I tried to apply this patch to our kernel, but I encountered some
> problems in building the kernel:
> 
> FATAL: fs/ext4/ext4.o(.text+0x24f2d): Section mismatch in reference
> from the function exit_ext4_mballoc() to the function
> .exit.text:ext4_remove_debugfs_entry()
> 
> Looking at the code, the problem seems to be that, exit_ext4_mballoc
> calls ext4_remove_debugfs_entry. And ext4_remove_debugfs_entry has the
> "__exit" annotation while exit_ext4_mballoc does not. I tried removing
> the "__exit" annotation from ext4_remove_debugfs_entry and it builds
> well.

Good catch; I didn't notice because I wasn't compiling with
CONFIG_DEBUG_SECTION_MISMATCH=y.  Your fix is the right one.

				       	      	  - Ted
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