linux-kernel - Re: [PATCH V2] mm: Replace all open encodings for NUMA_NO

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Date:   Tue, 27 Nov 2018 18:57:11 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     ocfs2-devel@....oracle.com, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, linux-media@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-rdma@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-block@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-ia64@...r.kernel.org, linux-alpha@...r.kernel.org,
        akpm@...ux-foundation.org, jiangqi903@...il.com,
        hverkuil@...all.nl, vkoul@...nel.org
Subject: Re: [PATCH V2] mm: Replace all open encodings for NUMA_NO_NODE

Anshuman Khandual <anshuman.khandual@....com> writes:
> At present there are multiple places where invalid node number is encoded
> as -1. Even though implicitly understood it is always better to have macros
> in there. Replace these open encodings for an invalid node number with the
> global macro NUMA_NO_NODE. This helps remove NUMA related assumptions like
> 'invalid node' from various places redirecting them to a common definition.
>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> Changes in V2:
>
> - Added inclusion of 'numa.h' header at various places per Andrew
> - Updated 'dev_to_node' to use NUMA_NO_NODE instead per Vinod
>
> Changes in V1: (https://lkml.org/lkml/2018/11/23/485)
>
> - Dropped OCFS2 changes per Joseph
> - Dropped media/video drivers changes per Hans
>
> RFC - https://patchwork.kernel.org/patch/10678035/
>
> Build tested this with multiple cross compiler options like alpha, sparc,
> arm64, x86, powerpc, powerpc64le etc with their default config which might
> not have compiled tested all driver related changes. I will appreciate
> folks giving this a test in their respective build environment.
>
> All these places for replacement were found by running the following grep
> patterns on the entire kernel code. Please let me know if this might have
> missed some instances. This might also have replaced some false positives.
> I will appreciate suggestions, inputs and review.
>
> 1. git grep "nid == -1"
> 2. git grep "node == -1"
> 3. git grep "nid = -1"
> 4. git grep "node = -1"
>
>  arch/alpha/include/asm/topology.h             |  3 ++-
>  arch/ia64/kernel/numa.c                       |  2 +-
>  arch/ia64/mm/discontig.c                      |  6 +++---
>  arch/ia64/sn/kernel/io_common.c               |  3 ++-
>  arch/powerpc/include/asm/pci-bridge.h         |  3 ++-
>  arch/powerpc/kernel/paca.c                    |  3 ++-
>  arch/powerpc/kernel/pci-common.c              |  3 ++-
>  arch/powerpc/mm/numa.c                        | 14 +++++++-------
>  arch/powerpc/platforms/powernv/memtrace.c     |  5 +++--

These powerpc changes all look fine.

Acked-by: Michael Ellerman <mpe@...erman.id.au>


cheers