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

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Date:	Thu, 16 Oct 2014 09:23:38 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	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>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH v1 07/10] vmcore: Remove "weak" from function
 declarations

On Wed, 15 Oct 2014 17:44:29 -0600
Bjorn Helgaas <bhelgaas@...gle.com> wrote:

> [+cc Martin, Heiko, linux-s390, since s390 could see issues from this.
> Sorry for all the spam; I should have gotten this right the first
> time.]
> 
> On Wed, Oct 15, 2014 at 5:31 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > [+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);
> >>
 
These __weak attributes can be removed as well without ill effect for s390.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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