linux-kernel - Re: [PATCH 03/12] mips: Combine memblock init and memory reservation loops

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Message-ID: <MWHPR2201MB127708440BA64024768F2B70C13C0@MWHPR2201MB1277.namprd22.prod.outlook.com>
Date:   Wed, 24 Apr 2019 22:30:38 +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 03/12] mips: Combine memblock init and memory reservation
  loops

Hello,

Serge Semin wrote:
> Before bootmem was completely removed from the kernel, the last loop
> in the bootmem_init() had been used to reserve the correspondingly
> marked regions, initialize sparsemem sections and to free the low memory
> pages, which then would be used for early memory allocations. After the
> bootmem removing patchset had been merged the loop was left to do the first
> two things only. But it didn't do them quite well.
> 
> First of all it leaves the BOOT_MEM_INIT_RAM memory types unreserved,
> which is definitely bug (although it isn't noticeable due to being used
> by the kernel region only, which is fully marked as reserved). Secondly
> the reservation is supposed to be done for any memory including the
> high one. (I couldn't figure out why the highmem was ignored in the first
> place, since platforms and dts' may declare any memory region for
> reservation) Thirdly the reserved_end variable had been used here to not
> accidentally free memory occupied by kernel. Since we already reserved the
> corresponding region higher in this method there is no need in using the
> variable here anymore. Fourthly the sparsemem should be aware of all the
> memory types in the system including the ROM_DATA even if it is going to
> be reserved for the whole system uptime. Finally after all these notes are
> fixed the loop of memory reservation can be freely merged into the memory
> installation loop as it's done in this patch.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Applied to mips-next.

Thanks,
    Paul

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