Re: [kbuild-all] [mmotm:master 119/211] mm/migrate.c:2184:5: note: in expansion of macro 'MIGRATE_PFN_DEVICE'

[Fengguang Wu <fengguang.wu@intel.com>]

Hi Andrew,

On Thu, Mar 16, 2017 at 08:41:35PM -0700, Andrew Morton wrote:
>On Fri, 17 Mar 2017 09:46:30 +0800 kbuild test robot <fengguang.wu@intel.com> wrote:
>
>> tree:   git://git.cmpxchg.org/linux-mmotm.git master
>> head:   8276ddb3c638602509386f1a05f75326dbf5ce09
>> commit: a6d9a210db7db40e98f7502608c6f1413c44b9b9 [119/211] mm/hmm/migrate: support un-addressable ZONE_DEVICE page in migration
>
>heh, I think the HMM patchset just scored the world record number of
>build errors.  Thanks for doing this.
>
>But why didn't we find out earlier than v18?  Don't you scoop patchsets
>off the mailing list *before* someone merges them into an upstream
>tree?

Yes we test LKML patches, however not all patches can be successfully
applied, so cannot be tested at all.

There is a way to significantly increase the chance of finding the
right git-apply base, however this idea needs buy-in by the GIT community:

        https://lkml.org/lkml/2017/3/9/956

Currently we rely on heuristics and try-outs to select a git base.
For this patchset, log shows it cannot be applied to all of these
common bases

- linus/master
- recent RC kernels
- mmotm/master
- linux-next/master


[2017-01-13 13:45:44] Applying to linus/master..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134544
[2017-01-13 13:45:45] Applying to linux/master..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134545
[2017-01-13 13:45:52] Applying to mmotm/master..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134552
[2017-01-13 13:46:03] Applying to v4.9-rc8..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134603
[2017-01-13 13:46:10] Applying to v4.9-rc7..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134610
[2017-01-13 13:46:14] Applying to v4.9-rc6..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134614
[2017-01-13 13:46:17] Applying to next-20170111..linux-review/J-r-me-Glisse/mm-memory-hotplug-convert-device-bool-to-int-to-allow-for-more-flags-v2/20170113-134617
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 01/15] mm/memory/hotplug: convert device bool to int to allow for more flags v2
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 02/15] mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device memory v2
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 03/15] mm/ZONE_DEVICE/free-page: callback when page is freed
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 04/15] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory v2
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 05/15] mm/ZONE_DEVICE/x86: add support for un-addressable device memory
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 06/15] mm/hmm: heterogeneous memory management (HMM for short)
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 07/15] mm/hmm/mirror: mirror process address space on device with HMM helpers
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 08/15] mm/hmm/mirror: helper to snapshot CPU page table
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 09/15] mm/hmm/mirror: device page fault handler
[2017-01-13 13:46:25] >>> apply-failed: "JA(C)rA'me Glisse" <jglisse@redhat.com> [HMM v16 10/15] mm/hmm/migrate: support un-addressable ZONE_DEVICE page in migration
...

Best Regards,
Fengguang Wu

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