linux-kernel - Re: [PATCH 2/9] MIPS: Remove "weak" from platform_maar

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Message-ID: <55A38910.1050509@imgtec.com>
Date:	Mon, 13 Jul 2015 10:46:56 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>
CC:	Andrew Bresticker <abrestic@...omium.org>,
	<linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] MIPS: Remove "weak" from platform_maar_init() declaration

On 13/07/15 00:11, Bjorn Helgaas wrote:
> Weak header file declarations are error-prone because they make every
> definition weak, and the linker chooses one based on link order (see
> 10629d711ed7 ("PCI: Remove __weak annotation from pcibios_get_phb_of_node
> decl")).
> 
> platform_maar_init() is defined in:
> 
>   - arch/mips/mm/init.c (where it is marked "weak")
>   - arch/mips/mti-malta/malta-memory.c (without annotation)
> 
> The "weak" attribute on the platform_maar_init() extern declaration applies
> to the platform-specific definition in arch/mips/mti-malta/malta-memory.c,
> so both definitions are weak, and which one we get depends on link order.
> 
> Remove the "weak" attribute from the declaration.  That makes the malta
> definition strong, so it will always be preferred if it is present.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: linux-mips@...ux-mips.org

Reviewed-by: James Hogan <james.hogan@...tec.com>

Cheers
James

> ---
>  arch/mips/include/asm/maar.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/mips/include/asm/maar.h b/arch/mips/include/asm/maar.h
> index 6c62b0f..b02891f 100644
> --- a/arch/mips/include/asm/maar.h
> +++ b/arch/mips/include/asm/maar.h
> @@ -26,7 +26,7 @@
>   *
>   * Return:	The number of MAAR pairs configured.
>   */
> -unsigned __weak platform_maar_init(unsigned num_pairs);
> +unsigned platform_maar_init(unsigned num_pairs);
>  
>  /**
>   * write_maar_pair() - write to a pair of MAARs
> 


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