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

Bjorn Helgaas
2014-10-15T23:44:29Z

[+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@google.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@google.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@google.com>
>> CC: Michael Holzheu <holzheu@linux.vnet.ibm.com>
>> CC: Vivek Goyal <vgoyal@redhat.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);
>>