linux-kernel - Re: swiotlb: Add missing _

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Date:	Thu, 1 Jan 2009 14:02:55 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Roland Dreier <rdreier@...co.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: swiotlb: Add missing __init annotations

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?

	Sam
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