linux-kernel - Re: [PATCH v2 4/5] mips: Make sure dt memory regions are valid

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Message-ID: <MWHPR2201MB1277083FDFA3D964B24F33B7C1300@MWHPR2201MB1277.namprd22.prod.outlook.com>
Date:   Mon, 6 May 2019 19:12:01 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Serge Semin <fancer.lancer@...il.com>
CC:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <pburton@...ecomp.com>,
        James Hogan <jhogan@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>,
        Huacai Chen <chenhc@...ote.com>,
        Stefan Agner <stefan@...er.ch>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Juergen Gross <jgross@...e.com>,
        Serge Semin <Sergey.Semin@...latforms.ru>,
        "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 v2 4/5] mips: Make sure dt memory regions are valid

Hello,

Serge Semin wrote:
> There are situations when memory regions coming from dts may be
> too big for the platform physical address space. This especially
> concerns XPA-capable systems. Bootloader may determine more than 4GB
> memory available and pass it to the kernel over dts memory node, while
> kernel is built without XPA/64BIT support. In this case the region
> may either simply be truncated by add_memory_region() method
> or by u64->phys_addr_t type casting. But in worst case the method
> can even drop the memory region if it exceeds PHYS_ADDR_MAX size.
> So lets make sure the retrieved from dts memory regions are valid,
> and if some of them aren't, just manually truncate them with a warning
> printed out.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Applied to mips-next.

Thanks,
    Paul

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