Re: [PATCH] arm: skip nomap memblocks while finding the lowmem/highmem boundary

[Mike Rapoport]

On Thu, Aug 22, 2019 at 03:59:42AM +0000, Chester Lin wrote:
> On Thu, Aug 22, 2019 at 11:45:34AM +0800, Chester Lin wrote:
> > adjust_lowmem_bounds() checks every memblocks in order to find the boundary
> > between lowmem and highmem. However some memblocks could be marked as NOMAP
> > so they are not used by kernel, which should be skipped while calculating
> > the boundary.
> > 
> > Signed-off-by: Chester Lin <clin@xxxxxxxx>
> > ---
> >  arch/arm/mm/mmu.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> > index 426d9085396b..b86dba44d828 100644
> > --- a/arch/arm/mm/mmu.c
> > +++ b/arch/arm/mm/mmu.c
> > @@ -1181,6 +1181,9 @@ void __init adjust_lowmem_bounds(void)
> >  		phys_addr_t block_start = reg->base;
> >  		phys_addr_t block_end = reg->base + reg->size;
> >  
> > +		if (memblock_is_nomap(reg))
> > +			continue;
> > +
> >  		if (reg->base < vmalloc_limit) {
> >  			if (block_end > lowmem_limit)
> >  				/*
> > -- 
> > 2.22.0
> >
> 
> Hi Russell, Mike and Ard,
> 
> Per the discussion in the thread "[PATH] efi/arm: fix allocation failure ...",
> (https://lkml.org/lkml/2019/8/21/163), I presume that the change to disregard
> NOMAP memblocks in adjust_lowmem_bounds() should be separated as a single patch.
> 
> Please let me know if any suggestion, thank you.

Let's add this one to the series: