Re: [PATCH] efi/arm: fix allocation failure when reserving the kernel base

Russell King - ARM Linux admin
2019-08-20T11:57:03Z

On Fri, Aug 02, 2019 at 05:38:54AM +0000, Chester Lin wrote:
> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> index f3ce34113f89..909b11ba48d8 100644
> --- a/arch/arm/mm/mmu.c
> +++ b/arch/arm/mm/mmu.c
> @@ -1184,6 +1184,9 @@ 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)
> /*

I think this hunk is sane - if the memory is marked nomap, then it isn't
available for the kernel's use, so as far as calculating where the
lowmem/highmem boundary is, it effectively doesn't exist and should be
skipped.

--
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