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Message-ID: <20190820115645.GP13294@shell.armlinux.org.uk>
Date: Tue, 20 Aug 2019 12:56:46 +0100
From: Russell King - ARM Linux admin <linux@...linux.org.uk>
To: Chester Lin <clin@...e.com>
Cc: "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
"ren_guo@...ky.com" <ren_guo@...ky.com>,
Juergen Gross <JGross@...e.com>,
"geert@...ux-m68k.org" <geert@...ux-m68k.org>,
"mingo@...nel.org" <mingo@...nel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
"guillaume.gardet@....com" <guillaume.gardet@....com>,
Joey Lee <JLee@...e.com>, Gary Lin <GLin@...e.com>
Subject: Re: [PATCH] efi/arm: fix allocation failure when reserving the
kernel base
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.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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