linux-kernel - Re: [PATCH 12/12] mips: Enable OF_RESERVED

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Message-ID: <20190424061750.GA30717@infradead.org>
Date:   Tue, 23 Apr 2019 23:17:50 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.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-kernel@...r.kernel.org
Subject: Re: [PATCH 12/12] mips: Enable OF_RESERVED_MEM config

On Wed, Apr 24, 2019 at 01:47:48AM +0300, Serge Semin wrote:
> Since memblock-patchset was introduced the reserved-memory nodes are
> supported being declared in dt-files. So these nodes are actually parsed
> during the arch setup procedure when the early_init_fdt_scan_reserved_mem()
> method is called. But some of the features like private reserved memory
> pools aren't available at the moment, since OF_RESERVED_MEM isn't enabled
> for the MIPS platform. Lets fix it by enabling the config.
> 
> But due to the arch-specific boot mem_map container utilization we need
> to manually call the fdt_init_reserved_mem() method after all the available
> and reserved memory has been moved to memblock. The function call performed
> before bootmem_init() fails due to the lack of any memblock memory regions
> to allocate from at that stage.

Architectures should not select this symbol directly, it will be
automatically enabled if either DMA_DECLARE_COHERENT or DMA_CMA
are enabled, which are required for the actual underlying memory
allocators.