linux-kernel - Re: [PATCH] drivers/base: export gpl (un)register_memory

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Message-Id: <1202839449.11188.35.camel@nimitz.home.sr71.net>
Date:	Tue, 12 Feb 2008 10:04:09 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	Jan-Bernd Themann <ossthema@...ibm.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	linux-ppc <linuxppc-dev@...abs.org>,
	Thomas Klein <osstklei@...ibm.com>,
	"Themann, Jan-Bernd" <themann@...ibm.com>,
	Greg KH <greg@...ah.com>, Christoph Raisch <RAISCH@...ibm.com>
Subject: Re: [PATCH] drivers/base: export gpl (un)register_memory_notifier

On Mon, 2008-02-11 at 17:24 +0100, Jan-Bernd Themann wrote:
> Drivers like eHEA need memory notifiers in order to 
> update their internal DMA memory map when memory is added
> to or removed from the system.
> 
> Patch for eHEA memory hotplug support that uses these functions:
> http://www.spinics.net/lists/netdev/msg54484.html

This driver is broken pretty horribly.  It won't even compile for a
plain ppc64 kernel:

http://sr71.net/~dave/linux/ehea-is-broken.config

I know it's used for very specific hardware, but this is the symptom of
it not using the proper abstracted interfaces to the VM.

In file included from /home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_main.c:42:
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.h:44:14: warning: "SECTION_SIZE_BITS" is not defined
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.h:45:2: error: #error eHEA module cannot work if kernel sectionsize < ehea sectionsize
  CC      drivers/net/mii.o
make[4]: *** [drivers/net/ehea/ehea_main.o] Error 1
make[4]: *** Waiting for unfinished jobs....
  CC      drivers/net/ixgb/ixgb_param.o
In file included from /home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:32:
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.h:44:14: warning: "SECTION_SIZE_BITS" is not defined
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.h:45:2: error: #error eHEA module cannot work if kernel sectionsize < ehea sectionsize
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c: In function 'ehea_create_busmap':
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:574: error: 'NR_MEM_SECTIONS' undeclared (first use in this function)
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:574: error: (Each undeclared identifier is reported only once
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:574: error: for each function it appears in.)
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:575: error: implicit declaration of function 'valid_section_nr'
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c: In function 'ehea_map_vaddr':
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:606: error: 'SECTION_SIZE_BITS' undeclared (first use in this function)
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c: In function 'ehea_reg_kernel_mr':
/home/dave/work/linux/2.6/23/linux-2.6.git/drivers/net/ehea/ehea_qmr.c:655: error: 'SECTION_SIZE_BITS' undeclared (first use in this function)

-- Dave

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