linux-kernel - Re: [PATCH v1 07/10] vmcore: Remove "weak" from function declarations

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Date:	Wed, 15 Oct 2014 17:31:14 -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>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v1 07/10] vmcore: Remove "weak" from function declarations

[+cc Michael, Vivek; sorry, I botched my "stg mail" so you weren't
included the first time]

On Wed, Oct 15, 2014 at 11:06 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> For the following functions:
>
>   elfcorehdr_alloc()
>   elfcorehdr_free()
>   elfcorehdr_read()
>   elfcorehdr_read_notes()
>   remap_oldmem_pfn_range()
>
> fs/proc/vmcore.c provides default definitions explicitly marked "weak".
> arch/s390 provides its own definitions intended to override the default
> ones, but the "weak" attribute on the declarations applied to the s390
> 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 declarations so we always prefer a
> non-weak definition over the weak one, independent of link order.
>
> Fixes: be8a8d069e50 ("vmcore: introduce ELF header in new memory feature")
> Fixes: 9cb218131de1 ("vmcore: introduce remap_oldmem_pfn_range()")
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
> CC: Vivek Goyal <vgoyal@...hat.com>
> ---
>  include/linux/crash_dump.h |   15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
> index 72ab536ad3de..3849fce7ecfe 100644
> --- a/include/linux/crash_dump.h
> +++ b/include/linux/crash_dump.h
> @@ -14,14 +14,13 @@
>  extern unsigned long long elfcorehdr_addr;
>  extern unsigned long long elfcorehdr_size;
>
> -extern int __weak elfcorehdr_alloc(unsigned long long *addr,
> -                                  unsigned long long *size);
> -extern void __weak elfcorehdr_free(unsigned long long addr);
> -extern ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos);
> -extern ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
> -extern int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma,
> -                                        unsigned long from, unsigned long pfn,
> -                                        unsigned long size, pgprot_t prot);
> +extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
> +extern void elfcorehdr_free(unsigned long long addr);
> +extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
> +extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
> +extern int remap_oldmem_pfn_range(struct vm_area_struct *vma,
> +                                 unsigned long from, unsigned long pfn,
> +                                 unsigned long size, pgprot_t prot);
>
>  extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
>                                                 unsigned long, int);
>
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