linux-kernel - Re: [PATCH] MIPS: init: Prevent adding memory before PHYS

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Message-ID: <MWHPR2201MB12776967D9AF2E04708D6582C19C0@MWHPR2201MB1277.namprd22.prod.outlook.com>
Date:   Wed, 2 Oct 2019 22:54:03 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Thomas Bogendoerfer <tbogendoerfer@...e.de>
CC:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <pburton@...ecomp.com>,
        James Hogan <jhogan@...nel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH] MIPS: init: Prevent adding memory before PHYS_OFFSET

Hello,

Thomas Bogendoerfer wrote:
> On some SGI machines (IP28 and IP30) a small region of memory is mirrored
> to pyhsical address 0 for exception vectors while rest of the memory
> is reachable at a higher physical address. ARC PROM marks this
> region as reserved, but with commit a94e4f24ec83 ("MIPS: init: Drop
> boot_mem_map") this chunk is used, when searching for start of ram,
> which breaks at least IP28 and IP30 machines. To fix this
> add_region_memory() checks for start address < PHYS_OFFSET and ignores
> these chunks.

Applied to mips-fixes.

> commit bd848d1b9235
> https://git.kernel.org/mips/c/bd848d1b9235
> 
> Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map")
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> Signed-off-by: Paul Burton <paul.burton@...s.com>

Thanks,
    Paul

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