From: Alexander Sverdlin <alexander.sverdlin@nokia.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>,
linux-mips@vger.kernel.org, Paul Burton <paulburton@kernel.org>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] MIPS: reserve the memblock right after the kernel
Date: Mon, 9 Nov 2020 11:34:33 +0100 [thread overview]
Message-ID: <1d6a424e-944e-7f21-1f30-989fb61018a8@nokia.com> (raw)
In-Reply-To: <20201107094028.GA4918@alpha.franken.de>
Hello Thomas,
On 07/11/2020 10:40, Thomas Bogendoerfer wrote:
>> 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 ?
while the shared structure which is being corrupted is indeed Octeon-specific,
the wrong assumption that the memory right after the kernel can be allocated by memblock
allocator and re-used somewhere in Linux is in MIPS-generic check_kernel_sections_mem().
I personally will be fine with repairing Octeon only as I don't have other MIPS
targets to care about, but maybe someone else in the MIPS community will find
this fix useful...
--
Best regards,
Alexander Sverdlin.
next prev parent reply other threads:[~2020-11-09 10:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 14:10 [PATCH] MIPS: reserve the memblock right after the kernel Alexander A Sverdlin
2020-11-07 9:40 ` Thomas Bogendoerfer
2020-11-09 10:34 ` Alexander Sverdlin [this message]
2020-11-09 11:08 ` Alexander Sverdlin
2020-11-10 9:55 ` Thomas Bogendoerfer
2020-11-10 10:29 ` Alexander Sverdlin
2020-11-11 14:52 ` Serge Semin
2020-11-13 2:30 ` Jiaxun Yang
2020-11-13 3:28 ` Jinyang He
2020-11-13 3:49 ` Maciej W. Rozycki
2020-11-13 12:29 ` Alexander Sverdlin
2020-11-13 12:56 ` Alexander Sverdlin
2020-11-13 9:17 ` Alexander Sverdlin
2020-11-13 13:09 ` Alexander Sverdlin
2020-11-16 22:31 ` Serge Semin
2020-11-17 9:41 ` Alexander Sverdlin
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