linux-kernel - Re: [Patch] Fix section mismatch of memory hotplug related code.

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Message-Id: <20070507220846.312B.Y-GOTO@jp.fujitsu.com>
Date:	Mon, 07 May 2007 22:16:49 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	Miles Lane <miles.lane@...il.com>
Subject: Re: [Patch] Fix section mismatch of memory hotplug related code.

> On Fri, May 04, 2007 at 05:04:21PM -0700, Andrew Morton wrote:
> > On Thu, 05 Apr 2007 17:01:02 +0900
> > Yasunori Goto <y-goto@...fujitsu.com> wrote:
> > 
> > > Hello.
> > > 
> > > This is to fix many section mismatches of code related to memory hotplug.
> > > I checked compile with memory hotplug on/off on ia64 and x86-64 box.
> > > 
> > > ..
> > >
> > > ===================================================================
> > > --- meminit.orig/drivers/acpi/numa.c	2007-04-04 20:15:58.000000000 +0900
> > > +++ meminit/drivers/acpi/numa.c	2007-04-04 20:56:34.000000000 +0900
> > > @@ -228,7 +228,7 @@ int __init acpi_numa_init(void)
> > >  	return 0;
> > >  }
> > >  
> > > -int acpi_get_pxm(acpi_handle h)
> > > +int __meminit acpi_get_pxm(acpi_handle h)
> > >  {
> > >  	unsigned long pxm;
> > >  	acpi_status status;
> > > @@ -246,7 +246,7 @@ int acpi_get_pxm(acpi_handle h)
> > >  }
> > >  EXPORT_SYMBOL(acpi_get_pxm);
> > >  
> > > -int acpi_get_node(acpi_handle *handle)
> > > +int __meminit acpi_get_node(acpi_handle *handle)
> > >  {
> > >  	int pxm, node = -1;
> > 
> > It doesn't make a lot of sense to export an __init symbol to modules.  I
> > guess it's OK in this case, but we get warnings:

Oops, I might do unnecessary things. :(

> 
> It seems wrong to me to first tell linker to discard the code after init and
> next to export the symbol to make it available for any module anytime.
> 
> Both function are relatively small so better avoid playing games and
> drop the __meminit tag.

It sounds reasonable. I'll do it.

Thanks.


-- 
Yasunori Goto 


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