Re: [PATCH v1 09/10] memory-hotplug: Remove "weak" from memory_block_size_bytes() declaration

Bjorn Helgaas
2014-10-15T23:38:02Z

[+cc Rashika, Nathan, Anton, Blanchard, Heiko, Yinghai, Martin,
linux-s390; sorry, I botched my "stg mail" so you weren't included the
first time. s390 and x86 define their own memory_block_size_bytes()
and are at risk for this problem.]

On Wed, Oct 15, 2014 at 11:06 AM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> drivers/base/memory.c provides a default memory_block_size_bytes()
> 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: 41f107266b19 ("drivers: base: Add prototype declaration to the header file")
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> CC: Rashika Kheria <rashika.kheria@gmail.com>
> CC: Nathan Fontenot <nfont@austin.ibm.com>
> CC: Anton Blanchard <anton@au1.ibm.com>
> CC: Heiko Carstens <heiko.carstens@de.ibm.com>
> CC: Yinghai Lu <yinghai@kernel.org>
> ---
> include/linux/memory.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/memory.h b/include/linux/memory.h
> index bb7384e3c3d8..8b8d8d12348e 100644
> --- a/include/linux/memory.h
> +++ b/include/linux/memory.h
> @@ -35,7 +35,7 @@ struct memory_block {
> };
>
> int arch_get_memory_phys_device(unsigned long start_pfn);
> -unsigned long __weak memory_block_size_bytes(void);
> +unsigned long memory_block_size_bytes(void);
>
> /* These states are exposed to userspace as text strings in sysfs */
> #define MEM_ONLINE (1<<0) /* exposed to userspace */
>