linux-kernel - Re: swiotlb: Add missing _

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Date:	Fri, 2 Jan 2009 20:25:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Roland Dreier <rdreier@...co.com>, linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: swiotlb: Add missing __init annotations


* Sam Ravnborg <sam@...nborg.org> wrote:

> On Tue, Dec 30, 2008 at 08:18:00PM -0800, Roland Dreier wrote:
> > The current kernel build warns:
> > 
> >     WARNING: vmlinux.o(.text+0x11458): Section mismatch in reference from the function swiotlb_alloc_boot() to the function .init.text:__alloc_bootmem_low()
> >     The function swiotlb_alloc_boot() references
> >     the function __init __alloc_bootmem_low().
> >     This is often because swiotlb_alloc_boot lacks a __init
> >     annotation or the annotation of __alloc_bootmem_low is wrong.
> >     
> >     WARNING: vmlinux.o(.text+0x1011f2): Section mismatch in reference from the function swiotlb_late_init_with_default_size() to the function .init.text:__alloc_bootmem_low()
> >     The function swiotlb_late_init_with_default_size() references
> >     the function __init __alloc_bootmem_low().
> >     This is often because swiotlb_late_init_with_default_size lacks a __init
> >     annotation or the annotation of __alloc_bootmem_low is wrong.
> > 
> > and indeed the functions calling __alloc_bootmem_low() can be marked
> > __init as well.
> > 
> > Signed-off-by: Roland Dreier <rolandd@...co.com>
> > ---
> > Not 100% sure if this is the correct fix but it seems OK for me.
> > 
> >  arch/x86/kernel/pci-swiotlb_64.c |    2 +-
> >  lib/swiotlb.c                    |    4 ++--
> >  2 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
> > index 242c344..8cba374 100644
> > --- a/arch/x86/kernel/pci-swiotlb_64.c
> > +++ b/arch/x86/kernel/pci-swiotlb_64.c
> > @@ -13,7 +13,7 @@
> >  
> >  int swiotlb __read_mostly;
> >  
> > -void *swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> > +void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> >  {
> >  	return alloc_bootmem_low_pages(size);
> >  }
> > diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> > index fa2dc4e..1b76f78 100644
> > --- a/lib/swiotlb.c
> > +++ b/lib/swiotlb.c
> > @@ -116,7 +116,7 @@ setup_io_tlb_npages(char *str)
> >  __setup("swiotlb=", setup_io_tlb_npages);
> >  /* make io_tlb_overflow tunable too? */
> >  
> > -void * __weak swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> > +void * __weak __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
> >  {
> >  	return alloc_bootmem_low_pages(size);
> >  }
> > @@ -186,7 +186,7 @@ static void swiotlb_print_info(unsigned long bytes)
> >   * Statically reserve bounce buffer space and initialize bounce buffer data
> >   * structures for the software IO TLB used to implement the DMA API.
> >   */
> > -void __init
> > +void __init __weak
> >  swiotlb_init_with_default_size(size_t default_size)
> 
> This change looks unrealted to __init annotation described in the 
> changelog. Was it intentional?

that hunk definitely looks wrong.

	Ingo
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