linux-kernel - Re: [PATCH V4 2/3] mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block

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Message-ID: <20200708132520.GD6308@gaia>
Date:   Wed, 8 Jul 2020 14:25:20 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, justin.he@....com, akpm@...ux-foundation.org,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-doc@...r.kernel.org,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 2/3] mm/sparsemem: Enable vmem_altmap support in
 vmemmap_alloc_block_buf()

On Mon, Jul 06, 2020 at 08:26:17AM +0530, Anshuman Khandual wrote:
> There are many instances where vmemap allocation is often switched between
> regular memory and device memory just based on whether altmap is available
> or not. vmemmap_alloc_block_buf() is used in various platforms to allocate
> vmemmap mappings. Lets also enable it to handle altmap based device memory
> allocation along with existing regular memory allocations. This will help
> in avoiding the altmap based allocation switch in many places. To summarize
> there are two different methods to call vmemmap_alloc_block_buf().
> 
> vmemmap_alloc_block_buf(size, node, NULL)   /* Allocate from system RAM */
> vmemmap_alloc_block_buf(size, node, altmap) /* Allocate from altmap */
> 
> This converts altmap_alloc_block_buf() into a static function, drops it's

s/it's/its/

> entry from the header and updates Documentation/vm/memory-model.rst.
> 
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-doc@...r.kernel.org
> Cc: x86@...nel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Tested-by: Jia He <justin.he@....com>
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

With the fallback argument dropped, the patch looks fine to me.

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