linux-kernel - Re: [PATCH v1 08/10] kgdb: Remove "weak" from kgdb_arch

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Date:	Wed, 15 Oct 2014 17:35:05 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	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>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Vineet Gupta <vgupta@...opsys.com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: Re: [PATCH v1 08/10] kgdb: Remove "weak" from kgdb_arch_pc() declaration

[+cc Harvey, Vineet, linux-sh; arc, sh, and x86 have kgdb_arch_pc()
definitions and could see issues from this]

On Wed, Oct 15, 2014 at 11:06 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> kernel/debug/debug_core.c provides a default kgdb_arch_pc() 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: 688b744d8bc8 ("kgdb: fix signedness mixmatches, add statics, add declaration to header")
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: Harvey Harrison <harvey.harrison@...il.com>
> ---
>  include/linux/kgdb.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
> index 6b06d378f3df..e465bb15912d 100644
> --- a/include/linux/kgdb.h
> +++ b/include/linux/kgdb.h
> @@ -283,7 +283,7 @@ struct kgdb_io {
>
>  extern struct kgdb_arch                arch_kgdb_ops;
>
> -extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
> +extern unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs);
>
>  #ifdef CONFIG_SERIAL_KGDB_NMI
>  extern int kgdb_register_nmi_console(void);
>
--
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