linux-kernel - Re: [PATCH v1 09/10] memory-hotplug: Remove "weak" from memory_block_size

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Date:	Thu, 16 Oct 2014 09:23:07 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...hat.com>,
	John Stultz <john.stultz@...aro.org>,
	Eric Paris <eparis@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Nathan Fontenot <nfont@...tin.ibm.com>,
	Anton Blanchard <anton@....ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH v1 09/10] memory-hotplug: Remove "weak" from
 memory_block_size_bytes() declaration

On Wed, 15 Oct 2014 17:38:02 -0600
Bjorn Helgaas <bhelgaas@...gle.com> wrote:

> [+cc Rashika, Nathan, Anton, Blanchard, Heiko, Yinghai, Martin,
> linux-s390; sorry, I botched my "stg mail" so you weren't included the
> first time.  s390 and x86 define their own memory_block_size_bytes()
> and are at risk for this problem.]
> 
> On Wed, Oct 15, 2014 at 11:06 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > drivers/base/memory.c provides a default memory_block_size_bytes()
> > definition explicitly marked "weak".  Several architectures provide their
> > own definitions intended to override the default, but the "weak" attribute
> > on the declaration applied to the arch definitions as well, so the linker
> > chose one based on link order (see 10629d711ed7 ("PCI: Remove __weak
> > annotation from pcibios_get_phb_of_node decl")).
> >
> > Remove the "weak" attribute from the declaration so we always prefer a
> > non-weak definition over the weak one, independent of link order.
> >
> > Fixes: 41f107266b19 ("drivers: base: Add prototype declaration to the header file")
> > Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > CC: Rashika Kheria <rashika.kheria@...il.com>
> > CC: Nathan Fontenot <nfont@...tin.ibm.com>
> > CC: Anton Blanchard <anton@....ibm.com>
> > CC: Heiko Carstens <heiko.carstens@...ibm.com>
> > CC: Yinghai Lu <yinghai@...nel.org>
> > ---
> >  include/linux/memory.h |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/linux/memory.h b/include/linux/memory.h
> > index bb7384e3c3d8..8b8d8d12348e 100644
> > --- a/include/linux/memory.h
> > +++ b/include/linux/memory.h
> > @@ -35,7 +35,7 @@ struct memory_block {
> >  };
> >
> >  int arch_get_memory_phys_device(unsigned long start_pfn);
> > -unsigned long __weak memory_block_size_bytes(void);
> > +unsigned long memory_block_size_bytes(void);
> >
> >  /* These states are exposed to userspace as text strings in sysfs */
> >  #define        MEM_ONLINE              (1<<0) /* exposed to userspace */
> >
 
s390 works fine with the __weak on memory_bloc_size_bytes.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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