linux-kernel - RE: Different WARNING: drivers/scsi/fcoe/libfcoe.o(.init.text+0x1a): Section mismatch in reference from the function init_module() to the function .exit.text:fcoe_transport

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Date:	Mon, 4 Jun 2012 20:52:43 +0000
From:	"Zou, Yi" <yi.zou@...el.com>
To:	Sam Ravnborg <sam@...nborg.org>,
	Witold Baryluk <baryluk@....if.uj.edu.pl>
CC:	"Love, Robert W" <robert.w.love@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"devel@...n-fcoe.org" <devel@...n-fcoe.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: Different WARNING:
	drivers/scsi/fcoe/libfcoe.o(.init.text+0x1a): Section mismatch in	reference
 from the function init_module() to the function
	.exit.text:fcoe_transport_exit()

> 
> > WARNING: drivers/scsi/fcoe/libfcoe.o(.init.text+0x1a): Section mismatch
> in reference from the function init_module() to the
> function .exit.text:fcoe_transport_exit()
> > The function __init init_module() references
> > a function __exit fcoe_transport_exit().
> > This is often seen when error handling in the init function
> > uses functionality in the exit path.
> > The fix is often to remove the __exit annotation of
> > fcoe_transport_exit() so it may be used outside an exit section.
> >
> >   CC      arch/x86/crypto/crc32c-intel.mod.o
> >   LD [M]  arch/x86/crypto/crc32c-intel.ko
> >   CC      arch/x86/crypto/salsa20-i586.mod.o
> >   LD [M]  arch/x86/crypto/salsa20-i586.ko
> >   CC      arch/x86/crypto/serpent-sse2-i586.mod.o
> >   LD [M]  arch/x86/crypto/serpent-sse2-i586.ko
> >
> >
> >
> > (I'm dropping previous CC list, as this warning is easier to solve,
> > probably just following this instructions - dropping __exit from
> > fcoe_transport_exit() should be fine, especially if indeed it is needed
> > from init_module in error path).
> 
> Correct - dropping __exit is the fix here.
> 
> 	Sam

> 	Sam
However, fcoe_transport_exit() is called only in module *exit* path by the
module exit func libfcoe_exit(), not in the init_module error path. Let me 
take a objdump of the libfcoe.o to see where your above section mismatch warning
is from. Is this on 32bit only?

yi

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