linux-kernel - Re: [PATCH v2 09/13] arm, arm64: move free_unused

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Date:   Sat, 14 Nov 2020 12:15:17 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>, Meelis Roos <mroos@...ux.ee>,
        Michael Schmitz <schmitzmic@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Will Deacon <will@...nel.org>, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-snps-arc@...ts.infradead.org
Subject: Re: [PATCH v2 09/13] arm, arm64: move free_unused_memmap() to
 generic mm

On Sun, Nov 01, 2020 at 07:04:50PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> ARM and ARM64 free unused parts of the memory map just before the
> initialization of the page allocator. To allow holes in the memory map both
> architectures overload pfn_valid() and define HAVE_ARCH_PFN_VALID.
> 
> Allowing holes in the memory map for FLATMEM may be useful for small
> machines, such as ARC and m68k and will enable those architectures to cease
> using DISCONTIGMEM and still support more than one memory bank.
> 
> Move the functions that free unused memory map to generic mm and enable
> them in case HAVE_ARCH_PFN_VALID=y.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>

For arm64:

Acked-by: Catalin Marinas <catalin.marinas@....com>