linux-kernel - Re: [PATCH 04/12] mips: Reserve memory for the kernel image resources

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Date:   Thu, 2 May 2019 18:35:46 +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>,
        Matt Redfearn <matt.redfearn@...s.com>,
        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>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH 04/12] mips: Reserve memory for the kernel image resources

Hello,

Serge Semin wrote:
> The reserved_end variable had been used by the bootmem_init() code
> to find a lowest limit of memory available for memmap blob. The original
> code just tried to find a free memory space higher than kernel was placed.
> This limitation seems justified for the memmap ragion search process, but
> I can't see any obvious reason to reserve the unused space below kernel
> seeing some platforms place it much higher than standard 1MB. Moreover
> the RELOCATION config enables it to be loaded at any memory address.
> So lets reserve the memory occupied by the kernel only, leaving the region
> below being free for allocations. After doing this we can now discard the
> code freeing a space between kernel _text and VMLINUX_LOAD_ADDRESS symbols
> since it's going to be free anyway (unless marked as reserved by
> platforms).
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Applied to mips-next.

Thanks,
    Paul

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