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Subject: Re: [PATCH V2] mm: Replace all open encodings for NUMA_NO_NODE
To:     Lubomir Rintel <lkundrak@v3.sk>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Cc:     ocfs2-devel@oss.oracle.com, linux-fbdev@vger.kernel.org,
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        sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-ia64@vger.kernel.org, linux-alpha@vger.kernel.org,
        akpm@linux-foundation.org, jiangqi903@gmail.com,
        hverkuil@xs4all.nl, vkoul@kernel.org
References: <1543235202-9075-1-git-send-email-anshuman.khandual@arm.com>
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From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <d58f8b38-660c-7673-4466-6651ad32eada@arm.com>
Date:   Wed, 5 Dec 2018 17:01:17 +0530
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On 12/05/2018 02:56 AM, Lubomir Rintel wrote:
> On Mon, 2018-11-26 at 17:56 +0530, Anshuman Khandual wrote:
>> 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@arm.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 +++--
>>  arch/sparc/kernel/auxio_32.c                  |  3 ++-
>>  arch/sparc/kernel/pci_fire.c                  |  3 ++-
>>  arch/sparc/kernel/pci_schizo.c                |  3 ++-
>>  arch/sparc/kernel/pcic.c                      |  7 ++++---
>>  arch/sparc/kernel/psycho_common.c             |  3 ++-
>>  arch/sparc/kernel/sbus.c                      |  3 ++-
>>  arch/sparc/mm/init_64.c                       |  6 +++---
>>  arch/sparc/prom/init_32.c                     |  3 ++-
>>  arch/sparc/prom/init_64.c                     |  5 +++--
>>  arch/sparc/prom/tree_32.c                     | 13 +++++++------
>>  arch/sparc/prom/tree_64.c                     | 19 ++++++++++---------
>>  arch/x86/include/asm/pci.h                    |  3 ++-
>>  arch/x86/kernel/apic/x2apic_uv_x.c            |  7 ++++---
>>  arch/x86/kernel/smpboot.c                     |  3 ++-
>>  arch/x86/platform/olpc/olpc_dt.c              | 17 +++++++++--------
>>  drivers/block/mtip32xx/mtip32xx.c             |  5 +++--
>>  drivers/dma/dmaengine.c                       |  4 +++-
>>  drivers/infiniband/hw/hfi1/affinity.c         |  3 ++-
>>  drivers/infiniband/hw/hfi1/init.c             |  3 ++-
>>  drivers/iommu/dmar.c                          |  5 +++--
>>  drivers/iommu/intel-iommu.c                   |  3 ++-
>>  drivers/misc/sgi-xp/xpc_uv.c                  |  3 ++-
>>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  5 +++--
>>  include/linux/device.h                        |  2 +-
>>  init/init_task.c                              |  3 ++-
>>  kernel/kthread.c                              |  3 ++-
>>  kernel/sched/fair.c                           | 15 ++++++++-------
>>  lib/cpumask.c                                 |  3 ++-
>>  mm/huge_memory.c                              | 13 +++++++------
>>  mm/hugetlb.c                                  |  3 ++-
>>  mm/ksm.c                                      |  2 +-
>>  mm/memory.c                                   |  7 ++++---
>>  mm/memory_hotplug.c                           | 12 ++++++------
>>  mm/mempolicy.c                                |  2 +-
>>  mm/page_alloc.c                               |  4 ++--
>>  mm/page_ext.c                                 |  2 +-
>>  net/core/pktgen.c                             |  3 ++-
>>  net/qrtr/qrtr.c                               |  3 ++-
>>  tools/perf/bench/numa.c                       |  6 +++---
>>  48 files changed, 146 insertions(+), 108 deletions(-)
> Thanks for the patch. It seems to me that you've got a fairly large
> amount of it wrong though -- perhaps relying just on "git grep" alone
> is not the best idea.

Hmm, okay.

> 
> The diffstat is not all that big, it is entirely plausible to just
> review each hunk manually: just do a "git show -U20" to get some
> context.
> 
> You get a NAK from me for the OLPC DT part, but I think at least the
> sparc/prom part also deals with device tree nodes and not NUMA nodes.

Will take a closer look at all the instances you have pointed out and
then re-spin the patch. Just wondering how should I take care of
Stephen's patch which is a fix for this one and available in Andrew's
staging tree. Should I just go ahead and fold both them with Stephen's
signed-off-by while re-spinning this patch ? Please suggest.