Re: [PATCH V4 2/3] mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block_buf()

[Catalin Marinas]

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@xxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: linux-doc@xxxxxxxxxxxxxxx
> Cc: x86@xxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Tested-by: Jia He <justin.he@xxxxxxx>
> Suggested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>

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

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