Re: [PATCH 2/2] arm64: mm: make pfn always valid with flat memory

[Catalin Marinas]

On Mon, Apr 11, 2016 at 07:08:38PM +0800, Xishi Qiu wrote:
> On 2016/4/5 16:22, Chen Feng wrote:
> 
> > Make the pfn always valid when using flat memory.
> > If the reserved memory is not align to memblock-size,
> > there will be holes in zone.
> > 
> > This patch makes the memory in buddy always in the
> > array of mem-map.
> > 
> > Signed-off-by: Chen Feng <puck.chen@xxxxxxxxxxxxx>
> > Signed-off-by: Fu Jun <oliver.fu@xxxxxxxxxxxxx>
> > ---
> >  arch/arm64/mm/init.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> > index ea989d8..0e1d5b7 100644
> > --- a/arch/arm64/mm/init.c
> > +++ b/arch/arm64/mm/init.c
> > @@ -306,7 +306,8 @@ static void __init free_unused_memmap(void)
> 
> How about let free_unused_memmap() support for CONFIG_SPARSEMEM_VMEMMAP?

We would need extra care to check that the memmap was actually allocated
in the first place.

-- 
Catalin