linux-kernel - Re: [PATCH v2 4/8] MIPS: Remove "weak" from get_c0_perfcount

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Date:	Tue, 14 Jul 2015 10:13:26 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Linux-MIPS <linux-mips@...ux-mips.org>,
	James Hogan <james.hogan@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] MIPS: Remove "weak" from get_c0_perfcount_int() declaration

Hi Bjorn,

On Tue, Jul 14, 2015 at 9:46 AM, Bjorn Helgaas <bhelgaas@...gle.com> 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")).
>
> get_c0_perfcount_int() is defined in several files.  Every definition is
> weak, so I assume Kconfig prevents two or more from being included.  The
> callers contain identical default code used when get_c0_perfcount_int()
> isn't defined at all.
>
> Add a weak get_c0_perfcount_int() definition with the default code and
> remove the weak annotation from the declaration.
>
> Then the platform implementations will be strong and will override the weak
> default.  If multiple platforms are ever configured in, we'll get a link
> error instead of calling a random platform's implementation.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: Andrew Bresticker <abrestic@...omium.org>

Reviewed-by: Andrew Bresticker <abrestic@...omium.org>
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