[PATCH] Extract initrd free logic from arch-specific code.

[Russell King - ARM Linux]

On Wed, Mar 28, 2018 at 10:58:51AM -0500, Rob Landley wrote:
> On 03/28/2018 10:26 AM, Shea Levy wrote:
> > Now only those architectures that have custom initrd free requirements
> > need to define free_initrd_mem.
> ...
> > --- a/arch/arc/mm/init.c
> > +++ b/arch/arc/mm/init.c
> > @@ -229,10 +229,3 @@ void __ref free_initmem(void)
> >  {
> >  	free_initmem_default(-1);
> >  }
> > -
> > -#ifdef CONFIG_BLK_DEV_INITRD
> > -void __init free_initrd_mem(unsigned long start, unsigned long end)
> > -{
> > -	free_reserved_area((void *)start, (void *)end, -1, "initrd");
> > -}
> > -#endif
> > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > index 3f972e83909b..19d1c5594e2d 100644
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -47,6 +47,7 @@ config ARM
> >  	select HARDIRQS_SW_RESEND
> >  	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
> >  	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
> > +	select HAVE_ARCH_FREE_INITRD_MEM
> >  	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
> >  	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
> >  	select HAVE_ARCH_MMAP_RND_BITS if MMU
> 
> Isn't this why weak symbols were invented?

Weak symbols means that we end up with both the weakly-referenced code
and the arch code in the kernel image.  That's fine if the weak code
is small.

-- 
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