Message-ID: <f5032553-9ec0-494c-8689-0e3a6a73853c@sirena.org.uk>
Date: Mon, 8 Sep 2025 16:16:13 +0100
From: Mark Brown <broonie@...nel.org>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, Alexander Potapenko <glider@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brendan Jackman <jackmanb@...gle.com>,
	Christoph Lameter <cl@...two.org>, Dennis Zhou <dennis@...nel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, iommu@...ts.linux.dev,
	io-uring@...r.kernel.org, Jason Gunthorpe <jgg@...dia.com>,
	Jens Axboe <axboe@...nel.dk>, Johannes Weiner <hannes@...xchg.org>,
	John Hubbard <jhubbard@...dia.com>, kasan-dev@...glegroups.com,
	kvm@...r.kernel.org, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arm-kernel@...s.com, linux-arm-kernel@...ts.infradead.org,
	linux-crypto@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-mm@...ck.org,
	linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Marco Elver <elver@...gle.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Hocko <mhocko@...e.com>, Mike Rapoport <rppt@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>, netdev@...r.kernel.org,
	Oscar Salvador <osalvador@...e.de>, Peter Xu <peterx@...hat.com>,
	Robin Murphy <robin.murphy@....com>,
	Suren Baghdasaryan <surenb@...gle.com>, Tejun Heo <tj@...nel.org>,
	virtualization@...ts.linux.dev, Vlastimil Babka <vbabka@...e.cz>,
	wireguard@...ts.zx2c4.com, x86@...nel.org, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v2 19/37] mm/gup: remove record_subpages()

On Mon, Sep 01, 2025 at 05:03:40PM +0200, David Hildenbrand wrote:
> We can just cleanup the code by calculating the #refs earlier,
> so we can just inline what remains of record_subpages().
> 
> Calculate the number of references/pages ahead of times, and record them
> only once all our tests passed.

I'm seeing failures in kselftest-mm in -next on at least Raspberry Pi 4
and Orion O6 which bisect to this patch.  I'm seeing a NULL pointer
dereference during the GUP test (which isn't actually doing anything as
I'm just using a standard defconfig rather than one with the mm
fragment):

# # # [RUN] R/O longterm GUP-fast pin in MAP_SHARED file mapping .[   92.209804] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008

...

[   92.443816] Call trace:
[   92.446284]  io_check_coalesce_buffer+0xd4/0x160 (P)
[   92.451306]  io_sqe_buffers_register+0x1b0/0x22c
[   92.455976]  __arm64_sys_io_uring_register+0x330/0xe74
[   92.461176]  invoke_syscall+0x48/0x104
[   92.464966]  el0_svc_common.constprop.0+0x40/0xe0

Full log:

  https://lava.sirena.org.uk/scheduler/job/1778528#L1985

The bisect looks to converge reasonably clearly, I didn't make much more
effort to diagnose:

# bad: [be5d4872e528796df9d7425f2bd9b3893eb3a42c] Add linux-next specific files for 20250905
# good: [5fe42852269dc659c8d511864410bd5cf3393e91] Merge branch 'for-linux-next-fixes' of https://gitlab.freedesktop.org/drm/misc/kernel.git
# good: [0ccc1eeda155c947d88ef053e0b54e434e218ee2] ASoC: dt-bindings: wlf,wm8960: Document routing strings (pin names)
# good: [7748328c2fd82efed24257b2bfd796eb1fa1d09b] ASoC: dt-bindings: qcom,lpass-va-macro: Update bindings for clocks to support ADSP
# good: [dd7ae5b8b3c291c0206f127a564ae1e316705ca0] ASoC: cs42l43: Shutdown jack detection on suspend
# good: [ce1a46b2d6a8465a86f7a6f71beb4c6de83bce5c] ASoC: codecs: lpass-wsa-macro: add Codev version 2.9
# good: [ce57b718006a069226b5e5d3afe7969acd59154e] ASoC: Intel: avs: ssm4567: Adjust platform name
# good: [94b39cb3ad6db935b585988b36378884199cd5fc] spi: mxs: fix "transfered"->"transferred"
# good: [5cc49b5a36b32a2dba41441ea13b93fb5ea21cfd] spi: spi-fsl-dspi: Report FIFO overflows as errors
# good: [3279052eab235bfb7130b1fabc74029c2260ed8d] ASoC: SOF: ipc4-topology: Fix a less than zero check on a u32
# good: [8f57dcf39fd0864f5f3e6701fe885e55f45d0d3a] ASoC: qcom: audioreach: convert to cpu endainess type before accessing
# good: [9d35d068fb138160709e04e3ee97fe29a6f8615b] regulator: scmi: Use int type to store negative error codes
# good: [8a9772ec08f87c9e45ab1ad2c8d2b8c1763836eb] ASoC: soc-dapm: rename snd_soc_kcontrol_component() to snd_soc_kcontrol_to_component()
# good: [07752abfa5dbf7cb4d9ce69fa94dc3b12bc597d9] ASoC: SOF: sof-client: Introduce sof_client_dev_entry structure
# good: [d57d27171c92e9049d5301785fb38de127b28fbf] ASoC: SOF: sof-client-probes: Add available points_info(), IPC4 only
# good: [f7c41911ad744177d8289820f01009dc93d8f91c] ASoC: SOF: ipc4-topology: Add support for float sample type
# good: [3d439e1ec3368fae17db379354bd7a9e568ca0ab] ASoC: sof: ipc4-topology: Add support to sched_domain attribute
# good: [5c39bc498f5ff7ef016abf3f16698f3e8db79677] ASoC: SOF: Intel: only detect codecs when HDA DSP probe
# good: [f522da9ab56c96db8703b2ea0f09be7cdc3bffeb] ASoC: doc: Internally link to Writing an ALSA Driver docs
# good: [f4672dc6e9c07643c8c755856ba8e9eb9ca95d0c] regmap: use int type to store negative error codes
# good: [b088b6189a4066b97cef459afd312fd168a76dea] ASoC: mediatek: common: Switch to for_each_available_child_of_node_scoped()
# good: [c42e36a488c7e01f833fc9f4814f735b66b2d494] spi: Drop dev_pm_domain_detach() call
# good: [a37280daa4d583c7212681c49b285de9464a5200] ASoC: Intel: avs: Allow i2s test and non-test boards to coexist
# good: [ff9a7857b7848227788f113d6dc6a72e989084e0] spi: rb4xx: use devm for clk_prepare_enable
# good: [edb5c1f885207d1d74e8a1528e6937e02829ee6e] ASoC: renesas: msiof: start DMAC first
# good: [e2ab5f600bb01d3625d667d97b3eb7538e388336] rust: regulator: use `to_result` for error handling
# good: [5b4dcaf851df8c414bfc2ac3bf9c65fc942f3be4] ASoC: amd: acp: Remove (explicitly) unused header
# good: [899fb38dd76dd3ede425bbaf8a96d390180a5d1c] regulator: core: Remove redundant ternary operators
# good: [11f5c5f9e43e9020bae452232983fe98e7abfce0] ASoC: qcom: use int type to store negative error codes
# good: [a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c] ASoC: tlv320aic32x4: use dev_err_probe() for regulators
# good: [f840737d1746398c2993be34bfdc80bdc19ecae2] ASoC: SOF: imx: Remove the use of dev_err_probe()
# good: [d78e48ebe04e9566f8ecbf51471e80da3adbceeb] ASoC: dt-bindings: Minor whitespace cleanup in example
# good: [96bcb34df55f7fee99795127c796315950c94fed] ASoC: test-component: Use kcalloc() instead of kzalloc()
# good: [c232495d28ca092d0c39b10e35d3d613bd2414ab] ASoC: dt-bindings: omap-twl4030: convert to DT schema
# good: [87a877de367d835b527d1086f75727123ef85fc4] KVM: x86: Rename handle_fastpath_set_msr_irqoff() to handle_fastpath_wrmsr()
# good: [c26675447faff8c4ddc1dc5d2cd28326b8181aaf] KVM: x86: Zero XSTATE components on INIT by iterating over supported features
# good: [ec0be3cdf40b5302248f3fb27a911cc630e8b855] regulator: consumer.rst: document bulk operations
# good: [27848c082ba0b22850fd9fb7b185c015423dcdc7] spi: s3c64xx: Remove the use of dev_err_probe()
# good: [c1dd310f1d76b4b13f1854618087af2513140897] spi: SPISG: Use devm_kcalloc() in aml_spisg_clk_init()
# good: [da9881d00153cc6d3917f6b74144b1d41b58338c] ASoC: qcom: audioreach: add support for SMECNS module
# good: [cf65182247761f7993737b710afe8c781699356b] ASoC: codecs: wsa883x: Handle shared reset GPIO for WSA883x speakers
# good: [2a55135201d5e24b80b7624880ff42eafd8e320c] ASoC: Intel: avs: Streamline register-component function names
# good: [550bc517e59347b3b1af7d290eac4fb1411a3d4e] regulator: bd718x7: Use kcalloc() instead of kzalloc()
# good: [0056b410355713556d8a10306f82e55b28d33ba8] spi: offload trigger: adi-util-sigma-delta: clean up imports
# good: [daf855f76a1210ceed9541f71ac5dd9be02018a6] ASoC: es8323: enable DAPM power widgets for playback DAC
# good: [90179609efa421b1ccc7d8eafbc078bafb25777c] spi: spl022: use min_t() to improve code
# good: [258384d8ce365dddd6c5c15204de8ccd53a7ab0a] ASoC: es8323: enable DAPM power widgets for playback DAC and output
# good: [6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d] regulator: rt5133: Fix spelling mistake "regualtor" -> "regulator"
# good: [a46e95c81e3a28926ab1904d9f754fef8318074d] ASoC: wl1273: Remove
# good: [48124569bbc6bfda1df3e9ee17b19d559f4b1aa3] spi: remove unneeded 'fast_io' parameter in regmap_config
# good: [37533933bfe92cd5a99ef4743f31dac62ccc8de0] regulator: remove unneeded 'fast_io' parameter in regmap_config
# good: [0e62438e476494a1891a8822b9785bc6e73e9c3f] ASoC: Intel: sst: Remove redundant semicolons
# good: [5c36b86d2bf68fbcad16169983ef7ee8c537db59] regmap: Remove superfluous check for !config in __regmap_init()
# good: [714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb] regulator: rt5133: Add RT5133 PMIC regulator Support
# good: [9c45f95222beecd6a284fd1284d54dd7a772cf59] spi: spi-qpic-snand: handle 'use_ecc' parameter of qcom_spi_config_cw_read()
# good: [bab4ab484a6ca170847da9bffe86f1fa90df4bbe] ASoC: dt-bindings: Convert brcm,bcm2835-i2s to DT schema
# good: [b832b19318534bb4f1673b24d78037fee339c679] spi: loopback-test: Don't use %pK through printk
# good: [8c02c8353460f8630313aef6810f34e134a3c1ee] ASoC: dt-bindings: realtek,alc5623: convert to DT schema
# good: [6b7e2aa50bdaf88cd4c2a5e2059a7bf32d85a8b1] spi: spi-qpic-snand: remove 'clr*status' members of struct 'qpic_ecc'
# good: [2291a2186305faaf8525d57849d8ba12ad63f5e7] MAINTAINERS: Add entry for FourSemi audio amplifiers
# good: [a54ef14188519a0994d0264f701f5771815fa11e] regulator: dt-bindings: Clean-up active-semi,act8945a duplication
# good: [a1d0b0ae65ae3f32597edfbb547f16c75601cd87] spi: spi-qpic-snand: avoid double assignment in qcom_spi_probe()
# good: [cf25eb8eae91bcae9b2065d84b0c0ba0f6d9dd34] ASoC: soc-component: unpack snd_soc_component_init_bias_level()
# good: [595b7f155b926460a00776cc581e4dcd01220006] ASoC: Intel: avs: Conditional-path support
# good: [3059067fd3378a5454e7928c08d20bf3ef186760] ASoC: cs48l32: Use PTR_ERR_OR_ZERO() to simplify code
# good: [2d86d2585ab929a143d1e6f8963da1499e33bf13] ASoC: pxa: add GPIOLIB_LEGACY dependency
# good: [9a200cbdb54349909a42b45379e792e4b39dd223] rust: regulator: implement Send and Sync for Regulator<T>
# good: [162e23657e5379f07c6404dbfbf4367cb438ea7d] regulator: pf0900: Add PMIC PF0900 support
# good: [886f42ce96e7ce80545704e7168a9c6b60cd6c03] regmap: mmio: Add missing MODULE_DESCRIPTION()
# good: [6684aba0780da9f505c202f27e68ee6d18c0aa66] XArray: Add extra debugging check to xas_lock and friends
git bisect start 'be5d4872e528796df9d7425f2bd9b3893eb3a42c' '5fe42852269dc659c8d511864410bd5cf3393e91' '0ccc1eeda155c947d88ef053e0b54e434e218ee2' '7748328c2fd82efed24257b2bfd796eb1fa1d09b' 'dd7ae5b8b3c291c0206f127a564ae1e316705ca0' 'ce1a46b2d6a8465a86f7a6f71beb4c6de83bce5c' 'ce57b718006a069226b5e5d3afe7969acd59154e' '94b39cb3ad6db935b585988b36378884199cd5fc' '5cc49b5a36b32a2dba41441ea13b93fb5ea21cfd' '3279052eab235bfb7130b1fabc74029c2260ed8d' '8f57dcf39fd0864f5f3e6701fe885e55f45d0d3a' '9d35d068fb138160709e04e3ee97fe29a6f8615b' '8a9772ec08f87c9e45ab1ad2c8d2b8c1763836eb' '07752abfa5dbf7cb4d9ce69fa94dc3b12bc597d9' 'd57d27171c92e9049d5301785fb38de127b28fbf' 'f7c41911ad744177d8289820f01009dc93d8f91c' '3d439e1ec3368fae17db379354bd7a9e568ca0ab' '5c39bc498f5ff7ef016abf3f16698f3e8db79677' 'f522da9ab56c96db8703b2ea0f09be7cdc3bffeb' 'f4672dc6e9c07643c8c755856ba8e9eb9ca95d0c' 'b088b6189a4066b97cef459afd312fd168a76dea' 'c42e36a488c7e01f833fc9f4814f735b66b2d494' 'a37280daa4d583c7212681c49b285de9464a5200' 'ff9a7857b7848227788f113d6dc6a72e989084e0' 'edb5c1f885207d1d74e8a1528e6937e02829ee6e' 'e2ab5f600bb01d3625d667d97b3eb7538e388336' '5b4dcaf851df8c414bfc2ac3bf9c65fc942f3be4' '899fb38dd76dd3ede425bbaf8a96d390180a5d1c' '11f5c5f9e43e9020bae452232983fe98e7abfce0' 'a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c' 'f840737d1746398c2993be34bfdc80bdc19ecae2' 'd78e48ebe04e9566f8ecbf51471e80da3adbceeb' '96bcb34df55f7fee99795127c796315950c94fed' 'c232495d28ca092d0c39b10e35d3d613bd2414ab' '87a877de367d835b527d1086f75727123ef85fc4' 'c26675447faff8c4ddc1dc5d2cd28326b8181aaf' 'ec0be3cdf40b5302248f3fb27a911cc630e8b855' '27848c082ba0b22850fd9fb7b185c015423dcdc7' 'c1dd310f1d76b4b13f1854618087af2513140897' 'da9881d00153cc6d3917f6b74144b1d41b58338c' 'cf65182247761f7993737b710afe8c781699356b' '2a55135201d5e24b80b7624880ff42eafd8e320c' '550bc517e59347b3b1af7d290eac4fb1411a3d4e' '0056b410355713556d8a10306f82e55b28d33ba8' 'daf855f76a1210ceed9541f71ac5dd9be02018a6' '90179609efa421b1ccc7d8eafbc078bafb25777c' '258384d8ce365dddd6c5c15204de8ccd53a7ab0a' '6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d' 'a46e95c81e3a28926ab1904d9f754fef8318074d' '48124569bbc6bfda1df3e9ee17b19d559f4b1aa3' '37533933bfe92cd5a99ef4743f31dac62ccc8de0' '0e62438e476494a1891a8822b9785bc6e73e9c3f' '5c36b86d2bf68fbcad16169983ef7ee8c537db59' '714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb' '9c45f95222beecd6a284fd1284d54dd7a772cf59' 'bab4ab484a6ca170847da9bffe86f1fa90df4bbe' 'b832b19318534bb4f1673b24d78037fee339c679' '8c02c8353460f8630313aef6810f34e134a3c1ee' '6b7e2aa50bdaf88cd4c2a5e2059a7bf32d85a8b1' '2291a2186305faaf8525d57849d8ba12ad63f5e7' 'a54ef14188519a0994d0264f701f5771815fa11e' 'a1d0b0ae65ae3f32597edfbb547f16c75601cd87' 'cf25eb8eae91bcae9b2065d84b0c0ba0f6d9dd34' '595b7f155b926460a00776cc581e4dcd01220006' '3059067fd3378a5454e7928c08d20bf3ef186760' '2d86d2585ab929a143d1e6f8963da1499e33bf13' '9a200cbdb54349909a42b45379e792e4b39dd223' '162e23657e5379f07c6404dbfbf4367cb438ea7d' '886f42ce96e7ce80545704e7168a9c6b60cd6c03' '6684aba0780da9f505c202f27e68ee6d18c0aa66'
# test job: [0ccc1eeda155c947d88ef053e0b54e434e218ee2] https://lava.sirena.org.uk/scheduler/job/1773040
# test job: [7748328c2fd82efed24257b2bfd796eb1fa1d09b] https://lava.sirena.org.uk/scheduler/job/1773378
# test job: [dd7ae5b8b3c291c0206f127a564ae1e316705ca0] https://lava.sirena.org.uk/scheduler/job/1773233
# test job: [ce1a46b2d6a8465a86f7a6f71beb4c6de83bce5c] https://lava.sirena.org.uk/scheduler/job/1768983
# test job: [ce57b718006a069226b5e5d3afe7969acd59154e] https://lava.sirena.org.uk/scheduler/job/1768713
# test job: [94b39cb3ad6db935b585988b36378884199cd5fc] https://lava.sirena.org.uk/scheduler/job/1768603
# test job: [5cc49b5a36b32a2dba41441ea13b93fb5ea21cfd] https://lava.sirena.org.uk/scheduler/job/1769293
# test job: [3279052eab235bfb7130b1fabc74029c2260ed8d] https://lava.sirena.org.uk/scheduler/job/1762427
# test job: [8f57dcf39fd0864f5f3e6701fe885e55f45d0d3a] https://lava.sirena.org.uk/scheduler/job/1760074
# test job: [9d35d068fb138160709e04e3ee97fe29a6f8615b] https://lava.sirena.org.uk/scheduler/job/1758673
# test job: [8a9772ec08f87c9e45ab1ad2c8d2b8c1763836eb] https://lava.sirena.org.uk/scheduler/job/1758556
# test job: [07752abfa5dbf7cb4d9ce69fa94dc3b12bc597d9] https://lava.sirena.org.uk/scheduler/job/1752251
# test job: [d57d27171c92e9049d5301785fb38de127b28fbf] https://lava.sirena.org.uk/scheduler/job/1752624
# test job: [f7c41911ad744177d8289820f01009dc93d8f91c] https://lava.sirena.org.uk/scheduler/job/1752345
# test job: [3d439e1ec3368fae17db379354bd7a9e568ca0ab] https://lava.sirena.org.uk/scheduler/job/1753454
# test job: [5c39bc498f5ff7ef016abf3f16698f3e8db79677] https://lava.sirena.org.uk/scheduler/job/1751954
# test job: [f522da9ab56c96db8703b2ea0f09be7cdc3bffeb] https://lava.sirena.org.uk/scheduler/job/1751875
# test job: [f4672dc6e9c07643c8c755856ba8e9eb9ca95d0c] https://lava.sirena.org.uk/scheduler/job/1747876
# test job: [b088b6189a4066b97cef459afd312fd168a76dea] https://lava.sirena.org.uk/scheduler/job/1746202
# test job: [c42e36a488c7e01f833fc9f4814f735b66b2d494] https://lava.sirena.org.uk/scheduler/job/1746271
# test job: [a37280daa4d583c7212681c49b285de9464a5200] https://lava.sirena.org.uk/scheduler/job/1746918
# test job: [ff9a7857b7848227788f113d6dc6a72e989084e0] https://lava.sirena.org.uk/scheduler/job/1746336
# test job: [edb5c1f885207d1d74e8a1528e6937e02829ee6e] https://lava.sirena.org.uk/scheduler/job/1746134
# test job: [e2ab5f600bb01d3625d667d97b3eb7538e388336] https://lava.sirena.org.uk/scheduler/job/1746607
# test job: [5b4dcaf851df8c414bfc2ac3bf9c65fc942f3be4] https://lava.sirena.org.uk/scheduler/job/1747672
# test job: [899fb38dd76dd3ede425bbaf8a96d390180a5d1c] https://lava.sirena.org.uk/scheduler/job/1747375
# test job: [11f5c5f9e43e9020bae452232983fe98e7abfce0] https://lava.sirena.org.uk/scheduler/job/1747503
# test job: [a12b74d2bd4724ee1883bc97ec93eac8fafc8d3c] https://lava.sirena.org.uk/scheduler/job/1734077
# test job: [f840737d1746398c2993be34bfdc80bdc19ecae2] https://lava.sirena.org.uk/scheduler/job/1727318
# test job: [d78e48ebe04e9566f8ecbf51471e80da3adbceeb] https://lava.sirena.org.uk/scheduler/job/1706175
# test job: [96bcb34df55f7fee99795127c796315950c94fed] https://lava.sirena.org.uk/scheduler/job/1699577
# test job: [c232495d28ca092d0c39b10e35d3d613bd2414ab] https://lava.sirena.org.uk/scheduler/job/1699507
# test job: [87a877de367d835b527d1086f75727123ef85fc4] https://lava.sirena.org.uk/scheduler/job/1697972
# test job: [c26675447faff8c4ddc1dc5d2cd28326b8181aaf] https://lava.sirena.org.uk/scheduler/job/1698132
# test job: [ec0be3cdf40b5302248f3fb27a911cc630e8b855] https://lava.sirena.org.uk/scheduler/job/1694308
# test job: [27848c082ba0b22850fd9fb7b185c015423dcdc7] https://lava.sirena.org.uk/scheduler/job/1693100
# test job: [c1dd310f1d76b4b13f1854618087af2513140897] https://lava.sirena.org.uk/scheduler/job/1693035
# test job: [da9881d00153cc6d3917f6b74144b1d41b58338c] https://lava.sirena.org.uk/scheduler/job/1693416
# test job: [cf65182247761f7993737b710afe8c781699356b] https://lava.sirena.org.uk/scheduler/job/1687562
# test job: [2a55135201d5e24b80b7624880ff42eafd8e320c] https://lava.sirena.org.uk/scheduler/job/1685772
# test job: [550bc517e59347b3b1af7d290eac4fb1411a3d4e] https://lava.sirena.org.uk/scheduler/job/1685910
# test job: [0056b410355713556d8a10306f82e55b28d33ba8] https://lava.sirena.org.uk/scheduler/job/1685649
# test job: [daf855f76a1210ceed9541f71ac5dd9be02018a6] https://lava.sirena.org.uk/scheduler/job/1685441
# test job: [90179609efa421b1ccc7d8eafbc078bafb25777c] https://lava.sirena.org.uk/scheduler/job/1686081
# test job: [258384d8ce365dddd6c5c15204de8ccd53a7ab0a] https://lava.sirena.org.uk/scheduler/job/1673411
# test job: [6d068f1ae2a2f713d7f21a9a602e65b3d6b6fc6d] https://lava.sirena.org.uk/scheduler/job/1673133
# test job: [a46e95c81e3a28926ab1904d9f754fef8318074d] https://lava.sirena.org.uk/scheduler/job/1673748
# test job: [48124569bbc6bfda1df3e9ee17b19d559f4b1aa3] https://lava.sirena.org.uk/scheduler/job/1670184
# test job: [37533933bfe92cd5a99ef4743f31dac62ccc8de0] https://lava.sirena.org.uk/scheduler/job/1668977
# test job: [0e62438e476494a1891a8822b9785bc6e73e9c3f] https://lava.sirena.org.uk/scheduler/job/1669534
# test job: [5c36b86d2bf68fbcad16169983ef7ee8c537db59] https://lava.sirena.org.uk/scheduler/job/1667971
# test job: [714165e1c4b0d5b8c6d095fe07f65e6e7047aaeb] https://lava.sirena.org.uk/scheduler/job/1667699
# test job: [9c45f95222beecd6a284fd1284d54dd7a772cf59] https://lava.sirena.org.uk/scheduler/job/1667598
# test job: [bab4ab484a6ca170847da9bffe86f1fa90df4bbe] https://lava.sirena.org.uk/scheduler/job/1664664
# test job: [b832b19318534bb4f1673b24d78037fee339c679] https://lava.sirena.org.uk/scheduler/job/1659213
# test job: [8c02c8353460f8630313aef6810f34e134a3c1ee] https://lava.sirena.org.uk/scheduler/job/1659264
# test job: [6b7e2aa50bdaf88cd4c2a5e2059a7bf32d85a8b1] https://lava.sirena.org.uk/scheduler/job/1656585
# test job: [2291a2186305faaf8525d57849d8ba12ad63f5e7] https://lava.sirena.org.uk/scheduler/job/1655709
# test job: [a54ef14188519a0994d0264f701f5771815fa11e] https://lava.sirena.org.uk/scheduler/job/1656024
# test job: [a1d0b0ae65ae3f32597edfbb547f16c75601cd87] https://lava.sirena.org.uk/scheduler/job/1654201
# test job: [cf25eb8eae91bcae9b2065d84b0c0ba0f6d9dd34] https://lava.sirena.org.uk/scheduler/job/1654790
# test job: [595b7f155b926460a00776cc581e4dcd01220006] https://lava.sirena.org.uk/scheduler/job/1653119
# test job: [3059067fd3378a5454e7928c08d20bf3ef186760] https://lava.sirena.org.uk/scheduler/job/1655440
# test job: [2d86d2585ab929a143d1e6f8963da1499e33bf13] https://lava.sirena.org.uk/scheduler/job/1655917
# test job: [9a200cbdb54349909a42b45379e792e4b39dd223] https://lava.sirena.org.uk/scheduler/job/1654762
# test job: [162e23657e5379f07c6404dbfbf4367cb438ea7d] https://lava.sirena.org.uk/scheduler/job/1652978
# test job: [886f42ce96e7ce80545704e7168a9c6b60cd6c03] https://lava.sirena.org.uk/scheduler/job/1654270
# test job: [6684aba0780da9f505c202f27e68ee6d18c0aa66] https://lava.sirena.org.uk/scheduler/job/1738722
# test job: [be5d4872e528796df9d7425f2bd9b3893eb3a42c] https://lava.sirena.org.uk/scheduler/job/1778528
# bad: [be5d4872e528796df9d7425f2bd9b3893eb3a42c] Add linux-next specific files for 20250905
git bisect bad be5d4872e528796df9d7425f2bd9b3893eb3a42c
# test job: [c3ce85ecd0268df1e0ca692e8126bb181fc89a08] https://lava.sirena.org.uk/scheduler/job/1779086
# bad: [c3ce85ecd0268df1e0ca692e8126bb181fc89a08] Merge branch 'main' of https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
git bisect bad c3ce85ecd0268df1e0ca692e8126bb181fc89a08
# test job: [973a887a5bb9a42878e276209592e0f75c287bb6] https://lava.sirena.org.uk/scheduler/job/1780104
# bad: [973a887a5bb9a42878e276209592e0f75c287bb6] Merge branch 'fs-next' of linux-next
git bisect bad 973a887a5bb9a42878e276209592e0f75c287bb6
# test job: [fdabd8890022a9439b95d7395f7ae046544d96fd] https://lava.sirena.org.uk/scheduler/job/1780530
# bad: [fdabd8890022a9439b95d7395f7ae046544d96fd] Merge branch 'for-next' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git
git bisect bad fdabd8890022a9439b95d7395f7ae046544d96fd
# test job: [94bd0249a4a06131c4a1c2097b6134217a658976] https://lava.sirena.org.uk/scheduler/job/1780904
# bad: [94bd0249a4a06131c4a1c2097b6134217a658976] Merge branch 'for-next' of https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
git bisect bad 94bd0249a4a06131c4a1c2097b6134217a658976
# test job: [702b6c2f1008779e8fc8a4a4438410165309a4b4] https://lava.sirena.org.uk/scheduler/job/1781370
# bad: [702b6c2f1008779e8fc8a4a4438410165309a4b4] kasan-apply-write-only-mode-in-kasan-kunit-testcases-v7
git bisect bad 702b6c2f1008779e8fc8a4a4438410165309a4b4
# test job: [0ac48805721d5952a920356e454167bba8d27737] https://lava.sirena.org.uk/scheduler/job/1781448
# good: [0ac48805721d5952a920356e454167bba8d27737] mm: convert page_to_section() to memdesc_section()
git bisect good 0ac48805721d5952a920356e454167bba8d27737
# test job: [dc731eba2e47fa81d50aa1cb167100889253cfe0] https://lava.sirena.org.uk/scheduler/job/1781608
# good: [dc731eba2e47fa81d50aa1cb167100889253cfe0] mm/damon/paddr: support addr_unit for MIGRATE_{HOT,COLD}
git bisect good dc731eba2e47fa81d50aa1cb167100889253cfe0
# test job: [e24bb041cafabaa5fa3d76386c86af389cc324f5] https://lava.sirena.org.uk/scheduler/job/1781660
# good: [e24bb041cafabaa5fa3d76386c86af389cc324f5] mm/memremap: reject unreasonable folio/compound page sizes in memremap_pages()
git bisect good e24bb041cafabaa5fa3d76386c86af389cc324f5
# test job: [62fd63f4688f40f01a6df23225523ece10d4b69a] https://lava.sirena.org.uk/scheduler/job/1781975
# bad: [62fd63f4688f40f01a6df23225523ece10d4b69a] dma-remap: drop nth_page() in dma_common_contiguous_remap()
git bisect bad 62fd63f4688f40f01a6df23225523ece10d4b69a
# test job: [cb42f7f6d9e4eff4e5259cddf82fd913306b8fe7] https://lava.sirena.org.uk/scheduler/job/1782145
# good: [cb42f7f6d9e4eff4e5259cddf82fd913306b8fe7] fs: hugetlbfs: remove nth_page() usage within folio in adjust_range_hwpoison()
git bisect good cb42f7f6d9e4eff4e5259cddf82fd913306b8fe7
# test job: [db076b5db550aa34169dceee81d0974c7b2a2482] https://lava.sirena.org.uk/scheduler/job/1782813
# bad: [db076b5db550aa34169dceee81d0974c7b2a2482] mm/gup: remove record_subpages()
git bisect bad db076b5db550aa34169dceee81d0974c7b2a2482
# test job: [891d0b3189945a5c37ce92c4e5337ec2c17b6378] https://lava.sirena.org.uk/scheduler/job/1782916
# good: [891d0b3189945a5c37ce92c4e5337ec2c17b6378] mm/pagewalk: drop nth_page() usage within folio in folio_walk_start()
git bisect good 891d0b3189945a5c37ce92c4e5337ec2c17b6378
# test job: [21999f6315d786cbd21d5b2d0ad56f3f6125279f] https://lava.sirena.org.uk/scheduler/job/1783020
# good: [21999f6315d786cbd21d5b2d0ad56f3f6125279f] mm/gup: drop nth_page() usage within folio when recording subpages
git bisect good 21999f6315d786cbd21d5b2d0ad56f3f6125279f
# first bad commit: [db076b5db550aa34169dceee81d0974c7b2a2482] mm/gup: remove record_subpages()

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