linux-kernel - Re: [PATCH] MIPS: reserve the memblock right after the kernel

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Message-ID: <20201107094028.GA4918@alpha.franken.de>
Date:   Sat, 7 Nov 2020 10:40:28 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Alexander A Sverdlin <alexander.sverdlin@...ia.com>
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>, linux-mips@...r.kernel.org,
        Paul Burton <paulburton@...nel.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] MIPS: reserve the memblock right after the kernel

On Fri, Nov 06, 2020 at 03:10:01PM +0100, Alexander A Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@...ia.com>
> 
> Linux doesn't own the memory immediately after the kernel image. On Octeon
> bootloader places a shared structure right close after the kernel _end,
> refer to "struct cvmx_bootinfo *octeon_bootinfo" in cavium-octeon/setup.c.
> 
> If check_kernel_sections_mem() rounds the PFNs up, first memblock_alloc()
> inside early_init_dt_alloc_memory_arch() <= device_tree_init() returns
> memory block overlapping with the above octeon_bootinfo structure, which
> is being overwritten afterwards.

as this special for Octeon how about added the memblock_reserve
in octen specific code ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]