This is the start of the stable review cycle for the 5.4.237 release.
There are 68 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Fri, 17 Mar 2023 11:57:10 +0000.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.237-rc…
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Linux 5.4.237-rc1
Stefan Haberland <sth(a)linux.ibm.com>
s390/dasd: add missing discipline function
Masahiro Yamada <masahiroy(a)kernel.org>
UML: define RUNTIME_DISCARD_EXIT
Tom Saeger <tom.saeger(a)oracle.com>
sh: define RUNTIME_DISCARD_EXIT
Masahiro Yamada <masahiroy(a)kernel.org>
s390: define RUNTIME_DISCARD_EXIT to fix link error with GNU ld < 2.36
Michael Ellerman <mpe(a)ellerman.id.au>
powerpc/vmlinux.lds: Don't discard .rela* for relocatable builds
Michael Ellerman <mpe(a)ellerman.id.au>
powerpc/vmlinux.lds: Define RUNTIME_DISCARD_EXIT
Masahiro Yamada <masahiroy(a)kernel.org>
arch: fix broken BuildID for arm64 and riscv
H.J. Lu <hjl.tools(a)gmail.com>
x86, vmlinux.lds: Add RUNTIME_DISCARD_EXIT to generic DISCARDS
John Harrison <John.C.Harrison(a)Intel.com>
drm/i915: Don't use BAR mappings for ring buffers with LLC
Corey Minyard <cminyard(a)mvista.com>
ipmi:watchdog: Set panic count to proper value on a panic
Yejune Deng <yejune.deng(a)gmail.com>
ipmi/watchdog: replace atomic_add() and atomic_sub()
Paul Elder <paul.elder(a)ideasonboard.com>
media: ov5640: Fix analogue gain control
Alvaro Karsz <alvaro.karsz(a)solid-run.com>
PCI: Avoid FLR for SolidRun SNET DPU rev 1
Alvaro Karsz <alvaro.karsz(a)solid-run.com>
PCI: Add SolidRun vendor ID
Nathan Chancellor <nathan(a)kernel.org>
macintosh: windfarm: Use unsigned type for 1-bit bitfields
Edward Humes <aurxenon(a)lunos.org>
alpha: fix R_ALPHA_LITERAL reloc for large modules
Christophe Leroy <christophe.leroy(a)csgroup.eu>
powerpc: Check !irq instead of irq == NO_IRQ and remove NO_IRQ
xurui <xurui(a)kylinos.cn>
MIPS: Fix a compilation issue
Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org>
clk: qcom: mmcc-apq8084: remove spdm clocks
Jan Kara <jack(a)suse.cz>
ext4: Fix deadlock during directory rename
Alexandre Ghiti <alexghiti(a)rivosinc.com>
riscv: Use READ_ONCE_NOCHECK in imprecise unwinding stack mode
D. Wythe <alibuda(a)linux.alibaba.com>
net/smc: fix fallback failed while sendmsg with fastopen
Chandrakanth Patil <chandrakanth.patil(a)broadcom.com>
scsi: megaraid_sas: Update max supported LD IDs to 240
Lorenz Bauer <lorenz.bauer(a)isovalent.com>
btf: fix resolving BTF_KIND_VAR after ARRAY, STRUCT, UNION, PTR
Florian Westphal <fw(a)strlen.de>
netfilter: tproxy: fix deadlock due to missing BH disable
Michael Chan <michael.chan(a)broadcom.com>
bnxt_en: Avoid order-5 memory allocation for TPA data
Shigeru Yoshida <syoshida(a)redhat.com>
net: caif: Fix use-after-free in cfusbl_device_notify()
Yuiko Oshino <yuiko.oshino(a)microchip.com>
net: lan78xx: fix accessing the LAN7800's internal phy specific registers from the MAC driver
Lee Jones <lee.jones(a)linaro.org>
net: usb: lan78xx: Remove lots of set but unused 'ret' variables
Hangbin Liu <liuhangbin(a)gmail.com>
selftests: nft_nat: ensuring the listening side is up before starting the client
Eric Dumazet <edumazet(a)google.com>
ila: do not generate empty messages in ila_xlat_nl_cmd_get_mapping()
Kang Chen <void0red(a)gmail.com>
nfc: fdp: add null check of devm_kmalloc_array in fdp_nci_i2c_read_device_properties
Dmitry Baryshkov <dmitry.baryshkov(a)linaro.org>
drm/msm/a5xx: fix setting of the CP_PREEMPT_ENABLE_LOCAL register
Jan Kara <jack(a)suse.cz>
ext4: Fix possible corruption when moving a directory
Bart Van Assche <bvanassche(a)acm.org>
scsi: core: Remove the /proc/scsi/${proc_name} directory earlier
Volker Lendecke <vl(a)samba.org>
cifs: Fix uninitialized memory read in smb3_qfs_tcon()
Amir Goldstein <amir73il(a)gmail.com>
SMB3: Backup intent flag missing from some more ops
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
ARM: dts: exynos: correct TMU phandle in Odroid XU3 family
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
ARM: dts: exynos: correct TMU phandle in Odroid HC1
Marek Szyprowski <m.szyprowski(a)samsung.com>
ARM: dts: exynos: Add GPU thermal zone cooling maps for Odroid XU3/XU4/HC1
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
ARM: dts: exynos: correct TMU phandle in Exynos5250
Krzysztof Kozlowski <krzk(a)kernel.org>
ARM: dts: exynos: Override thermal by label in Exynos5250
Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>
ARM: dts: exynos: correct TMU phandle in Exynos4210
Krzysztof Kozlowski <krzk(a)kernel.org>
ARM: dts: exynos: Override thermal by label in Exynos4210
Jacob Pan <jacob.jun.pan(a)linux.intel.com>
iommu/vt-d: Fix PASID directory pointer coherency
Marc Zyngier <maz(a)kernel.org>
irqdomain: Fix domain registration race
Bixuan Cui <cuibixuan(a)huawei.com>
irqdomain: Change the type of 'size' in __irq_domain_add() to be consistent
Corey Minyard <cminyard(a)mvista.com>
ipmi:ssif: Add a timer between request retries
Corey Minyard <cminyard(a)mvista.com>
ipmi:ssif: Increase the message retry time
Corey Minyard <cminyard(a)mvista.com>
ipmi:ssif: Remove rtc_us_timer
Corey Minyard <cminyard(a)mvista.com>
ipmi:ssif: resend_msg() cannot fail
Liguang Zhang <zhangliguang(a)linux.alibaba.com>
ipmi:ssif: make ssif_i2c_send() void
Gavrilov Ilia <Ilia.Gavrilov(a)infotecs.ru>
iommu/amd: Add a length limitation for the ivrs_acpihid command-line parameter
Kim Phillips <kim.phillips(a)amd.com>
iommu/amd: Fix ill-formed ivrs_ioapic, ivrs_hpet and ivrs_acpihid options
Suravee Suthikulpanit <suravee.suthikulpanit(a)amd.com>
iommu/amd: Add PCI segment support for ivrs_[ioapic/hpet/acpihid] commands
Jani Nikula <jani.nikula(a)intel.com>
drm/edid: fix AVI infoframe aspect ratio handling
Wayne Lin <Wayne.Lin(a)amd.com>
drm/edid: Add aspect ratios to HDMI 4K modes
Ville Syrjälä <ville.syrjala(a)linux.intel.com>
drm/edid: Fix HDMI VIC handling
Ville Syrjälä <ville.syrjala(a)linux.intel.com>
drm/edid: Extract drm_mode_cea_vic()
Fedor Pchelkin <pchelkin(a)ispras.ru>
nfc: change order inside nfc_se_io error path
Zhihao Cheng <chengzhihao1(a)huawei.com>
ext4: zero i_disksize when initializing the bootloader inode
Ye Bin <yebin10(a)huawei.com>
ext4: fix WARNING in ext4_update_inline_data
Ye Bin <yebin10(a)huawei.com>
ext4: move where set the MAY_INLINE_DATA flag is set
Darrick J. Wong <djwong(a)kernel.org>
ext4: fix another off-by-one fsmap error on 1k block filesystems
Eric Whitney <enwlinux(a)gmail.com>
ext4: fix RENAME_WHITEOUT handling for inline directories
Harry Wentland <harry.wentland(a)amd.com>
drm/connector: print max_requested_bpc in state debugfs
Andrew Cooper <andrew.cooper3(a)citrix.com>
x86/CPU/AMD: Disable XSAVES on AMD family 0x17
Theodore Ts'o <tytso(a)mit.edu>
fs: prevent out-of-bounds array speculation when closing a file descriptor
-------------
Diffstat:
Documentation/admin-guide/kernel-parameters.txt | 51 +++-
Makefile | 4 +-
arch/alpha/kernel/module.c | 4 +-
arch/arm/boot/dts/exynos4210.dtsi | 35 ++-
arch/arm/boot/dts/exynos5250.dtsi | 38 ++-
arch/arm/boot/dts/exynos5422-odroidhc1.dts | 38 ++-
arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 67 ++++-
arch/mips/include/asm/mach-rc32434/pci.h | 2 +-
arch/powerpc/include/asm/irq.h | 3 -
arch/powerpc/kernel/vmlinux.lds.S | 6 +-
arch/powerpc/platforms/44x/fsp2.c | 2 +-
arch/riscv/kernel/stacktrace.c | 2 +-
arch/s390/kernel/vmlinux.lds.S | 2 +
arch/sh/kernel/vmlinux.lds.S | 1 +
arch/um/kernel/vmlinux.lds.S | 2 +-
arch/x86/kernel/cpu/amd.c | 9 +
arch/x86/kernel/vmlinux.lds.S | 2 +
drivers/char/ipmi/ipmi_ssif.c | 146 ++++-------
drivers/char/ipmi/ipmi_watchdog.c | 8 +-
drivers/clk/qcom/mmcc-apq8084.c | 271 ---------------------
drivers/gpu/drm/drm_atomic.c | 1 +
drivers/gpu/drm/drm_edid.c | 130 ++++++----
drivers/gpu/drm/i915/gt/intel_ringbuffer.c | 4 +-
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 +-
drivers/iommu/amd_iommu_init.c | 105 ++++++--
drivers/iommu/intel-pasid.c | 7 +
drivers/macintosh/windfarm_lm75_sensor.c | 4 +-
drivers/macintosh/windfarm_smu_sensors.c | 4 +-
drivers/media/i2c/ov5640.c | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 23 +-
drivers/net/phy/microchip.c | 32 +++
drivers/net/usb/lan78xx.c | 189 ++++++--------
drivers/nfc/fdp/i2c.c | 4 +
drivers/pci/quirks.c | 8 +
drivers/s390/block/dasd_diag.c | 7 +-
drivers/s390/block/dasd_fba.c | 7 +-
drivers/s390/block/dasd_int.h | 1 -
drivers/scsi/hosts.c | 2 +
drivers/scsi/megaraid/megaraid_sas.h | 2 +
drivers/scsi/megaraid/megaraid_sas_fp.c | 2 +-
fs/cifs/cifsacl.c | 14 +-
fs/cifs/cifsfs.c | 2 +-
fs/cifs/cifsglob.h | 6 +-
fs/cifs/cifsproto.h | 8 +
fs/cifs/connect.c | 2 +-
fs/cifs/dir.c | 5 +-
fs/cifs/file.c | 10 +-
fs/cifs/inode.c | 8 +-
fs/cifs/ioctl.c | 2 +-
fs/cifs/link.c | 18 +-
fs/cifs/smb1ops.c | 19 +-
fs/cifs/smb2inode.c | 9 +-
fs/cifs/smb2ops.c | 92 +++----
fs/cifs/smb2proto.h | 2 +-
fs/ext4/fsmap.c | 2 +
fs/ext4/inline.c | 1 -
fs/ext4/inode.c | 7 +-
fs/ext4/ioctl.c | 1 +
fs/ext4/namei.c | 36 ++-
fs/ext4/xattr.c | 3 +
fs/file.c | 1 +
include/asm-generic/vmlinux.lds.h | 16 +-
include/linux/irqdomain.h | 2 +-
include/linux/pci_ids.h | 2 +
include/net/netfilter/nf_tproxy.h | 7 +
kernel/bpf/btf.c | 1 +
kernel/irq/irqdomain.c | 62 +++--
net/caif/caif_usb.c | 3 +
net/ipv4/netfilter/nf_tproxy_ipv4.c | 2 +-
net/ipv6/ila/ila_xlat.c | 1 +
net/ipv6/netfilter/nf_tproxy_ipv6.c | 2 +-
net/nfc/netlink.c | 2 +-
net/smc/af_smc.c | 13 +-
tools/testing/selftests/netfilter/nft_nat.sh | 2 +
74 files changed, 783 insertions(+), 811 deletions(-)
> Now i wounder if you are fixing the wrong thing. Maybe you should be
> fixing the PHY so it does not report up and then down? You say 'very
> snall intervals', which should in fact be 1 second. So is the PHY
> reporting link for a number of poll intervals? 1min to 10 minutes?
>
> Andrew
>
> Yes, according to the log records, the phy polls every second,
> but the link status changes take time.
> Generally, it takes 10 seconds for the phy to detect link down,
> but occasionally it takes several minutes to detect link down,
What PHY driver is this?
It is not so clear what should actually happen with auto-neg turned
off. With it on, and the link going down, the PHY should react after
about 1 second. It is not supposed to react faster than that, although
some PHYs allow fast link down notification to be configured.
Have you checked 802.3 to see what it says about auto-neg off and link
down detection?
I personally would not suppress this behaviour in the MAC
driver. Otherwise you are going to have funny combinations of special
cases of a feature which very few people actually use, making your
maintenance costs higher.
Andrew
This is a new document based on my 2022 blog post:
https://blogs.oracle.com/linux/post/backporting-patches-using-git
Although this is aimed at stable contributors and distro maintainers,
it does also contain useful tips and tricks for anybody who needs to
resolve merge conflicts.
By adding this to the kernel as documentation we can more easily point
to it e.g. from stable emails about failed backports, as well as allow
the community to modify it over time if necessary.
I've added this under process/ since it also has
process/applying-patches.rst. Another interesting document is
maintainer/rebasing-and-merging.rst which maybe should eventually refer
to this one, but I'm leaving that as a future cleanup.
Thanks to Harshit Mogalapalli for helping with the original blog post
as well as this updated document and Bagas Sanjaya for providing
thoughtful feedback.
v2: fixed heading style, link style, placeholder style, other comments
Link: https://lore.kernel.org/linux-doc/20230303162553.17212-1-vegard.nossum@orac…
Cc: Harshit Mogalapalli <harshit.m.mogalapalli(a)oracle.com>
Cc: Bagas Sanjaya <bagasdotme(a)gmail.com>
Cc: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Cc: Stephen Rothwell <sfr(a)canb.auug.org.au>
Cc: Jason A. Donenfeld <Jason(a)zx2c4.com>
Cc: Konstantin Ryabitsev <konstantin(a)linuxfoundation.org>
Signed-off-by: Vegard Nossum <vegard.nossum(a)oracle.com>
---
Documentation/process/backporting.rst | 514 ++++++++++++++++++++++++++
Documentation/process/index.rst | 1 +
2 files changed, 515 insertions(+)
create mode 100644 Documentation/process/backporting.rst
diff --git a/Documentation/process/backporting.rst b/Documentation/process/backporting.rst
new file mode 100644
index 0000000000000..7593980af9659
--- /dev/null
+++ b/Documentation/process/backporting.rst
@@ -0,0 +1,514 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================================
+Backporting and conflict resolution
+===================================
+
+:Author: Vegard Nossum <vegard.nossum(a)oracle.com>
+
+.. contents::
+ :local:
+ :depth: 3
+ :backlinks: none
+
+Introduction
+============
+
+Some developers may never really have to deal with backporting patches,
+merging branches, or resolving conflicts in their day-to-day work, so
+when a merge conflict does pop up, it can be daunting. Luckily,
+resolving conflicts is a skill like any other, and there are many useful
+techniques you can use to make the process smoother and increase your
+confidence in the result.
+
+This document aims to be a comprehensive, step-by-step guide to
+backporting and conflict resolution.
+
+Applying the patch to a tree
+============================
+
+Sometimes the patch you are backporting already exists as a git commit,
+in which case you just cherry-pick it directly using
+``git cherry-pick``. However, if the patch comes from an email, as it
+often does for the Linux kernel, you will need to apply it to a tree
+using ``git am``.
+
+If you've ever used ``git am``, you probably already know that it is
+quite picky about the patch applying perfectly to your source tree. In
+fact, you've probably had nightmares about ``.rej`` files and trying to
+edit the patch to make it apply.
+
+It is strongly recommended to instead find an appropriate base version
+where the patch applies cleanly and *then* cherry-pick it over to your
+destination tree, as this will make git output conflict markers and let
+you resolve conflicts with the help of git and any other conflict
+resolution tools you might prefer to use. For example, if you want to
+apply a patch that just arrived on LKML to an older stable kernel, you
+can apply it to the most recent mainline kernel and then cherry-pick it
+to your older stable branch.
+
+It's generally better to use the exact same base as the one the patch
+was generated from, but it doesn't really matter that much as long as it
+applies cleanly and isn't too far from the original base. The only
+problem with applying the patch to the "wrong" base is that it may pull
+in more unrelated changes in the context of the diff when cherry-picking
+it to the older branch.
+
+If you are using `b4`_. and you are applying the patch directly from an
+email, you can use ``b4 am`` with the options ``-g``/``--guess-base``
+and ``-3``/``--prep-3way`` to do some of this automatically (see the
+`b4 presentation`_ for more information). However, the rest of this
+article will assume that you are doing a plain ``git cherry-pick``.
+
+.. _b4: https://people.kernel.org/monsieuricon/introducing-b4-and-patch-attestation
+.. _b4 presentation: https://youtu.be/mF10hgVIx9o?t=2996
+
+Once you have the patch in git, you can go ahead and cherry-pick it into
+your source tree. Don't forget to cherry-pick with ``-x`` if you want a
+written record of where the patch came from!
+
+Note that if you are submiting a patch for stable, the format is
+slightly different; the first line after the subject line needs tobe
+either::
+
+ commit <upstream commit> upstream
+
+or::
+
+ [ Upstream commit <upstream commit> ]
+
+Resolving conflicts
+===================
+
+Uh-oh; the cherry-pick failed with a vaguely threatening message::
+
+ CONFLICT (content): Merge conflict
+
+What to do now?
+
+In general, conflicts appear when the context of the patch (i.e., the
+lines being changed and/or the lines surrounding the changes) doesn't
+match what's in the tree you are trying to apply the patch *to*.
+
+For backports, what likely happened was that the branch you are
+backporting from contains patches not in the branch you are backporting
+to. However, the reverse is also possible. In any case, the result is a
+conflict that needs to be resolved.
+
+If your attempted cherry-pick fails with a conflict, git automatically
+edits the files to include so-called conflict markers showing you where
+the conflict is and how the two branches have diverged. Resolving the
+conflict typically means editing the end result in such a way that it
+takes into account these other commits.
+
+Resolving the conflict can be done either by hand in a regular text
+editor or using a dedicated conflict resolution tool.
+
+Many people prefer to use their regular text editor and edit the
+conflict directly, as it may be easier to understand what you're doing
+and to control the final result. There are definitely pros and cons to
+each method, and sometimes there's value in using both.
+
+We will not cover using dedicated merge tools here beyond providing some
+pointers to various tools that you could use:
+
+- `vimdiff/gvimdiff <https://linux.die.net/man/1/vimdiff>`__
+- `KDiff3 <http://kdiff3.sourceforge.net/>`__
+- `TortoiseMerge <https://tortoisesvn.net/TortoiseMerge.html>`__
+- `Meld <https://meldmerge.org/help/>`__
+- `P4Merge <https://www.perforce.com/products/helix-core-apps/merge-diff-tool-p4merge>`__
+- `Beyond Compare <https://www.scootersoftware.com/>`__
+- `IntelliJ <https://www.jetbrains.com/help/idea/resolve-conflicts.html>`__
+- `VSCode <https://code.visualstudio.com/docs/editor/versioncontrol>`__
+
+To configure git to work with these, see ``git mergetool --help`` or
+the official `git-mergetool documentation`_.
+
+.. _git-mergetool documentation: https://git-scm.com/docs/git-mergetool
+
+Prerequisite patches
+--------------------
+
+Most conflicts happen because the branch you are backporting to is
+missing some patches compared to the branch you are backporting *from*.
+In the more general case (such as merging two independent branches),
+development could have happened on either branch, or the branches have
+simply diverged -- perhaps your older branch had some other backports
+applied to it that themselves needed conflict resolutions, causing a
+divergence.
+
+It's important to always identify the commit or commits that caused the
+conflict, as otherwise you cannot be confident in the correctness of
+your resolution. As an added bonus, especially if the patch is in an
+area you're not that famliar with, the changelogs of these commits will
+often give you the context to understand the code and potential problems
+or pitfalls with your conflict resolution.
+
+git log
+~~~~~~~
+
+A good first step is to look at ``git log`` for the file that has the
+conflict -- this is usually sufficient when there aren't a lot of
+patches to the file, but may get confusing if the file is big and
+frequently patched. You should run ``git log`` on the range of commits
+between your currently checked-out branch (``HEAD``) and the parent of
+the patch you are picking (``<commit>``), i.e.::
+
+ git log HEAD..<commit>^ -- <path>
+
+Even better, if you want to restrict this output to a single function
+(because that's where the conflict appears), you can use the following
+syntax::
+
+ git log -L:'\<function\>':<path> HEAD..<commit>^
+
+.. note::
+ The ``\<`` and ``\>`` around the function name ensure that the
+ matches are anchored on a word boundary. This is important, as this
+ part is actually a regex and git only follows the first match, so
+ if you use ``-L:thread_stack:kernel/fork.c`` it may only give you
+ results for the function ``try_release_thread_stack_to_cache`` even
+ though there are many other functions in that file containing the
+ string ``thread_stack`` in their names.
+
+Another useful option for ``git log`` is ``-G``, which allows you to
+filter on certain strings appearing in the diffs of the commits you are
+listing::
+
+ git log -G'regex' HEAD..<commit>^ -- <path>
+
+This can also be a handy way to quickly find when something (e.g. a
+function call or a variable) was changed, added, or removed. The search
+string is a regular expression, which means you can potentially search
+for more specific things like assignments to a specific struct member::
+
+ git log -G'\->index\>.*='
+
+git blame
+~~~~~~~~~
+
+Another way to find prerequisite commits (albeit only the most recent
+one for a given conflict) is to run ``git blame``. In this case, you
+need to run it against the parent commit of the patch you are
+cherry-picking and the file where the conflict appared, i.e.::
+
+ git blame <commit>^ -- <path>
+
+This command also accepts the ``-L`` argument (for restricting the
+output to a single function), but in this case you specify the filename
+at the end of the command as usual::
+
+ git blame -L:'\<function\>' <commit>^ -- <path>
+
+Navigate to the place where the conflict occurred. The first column of
+the blame output is the commit ID of the patch that added a given line
+of code.
+
+It might be a good idea to ``git show`` these commits and see if they
+look like they might be the source of the conflict. Sometimes there will
+be more than one of these commits, either because multiple commits
+changed different lines of the same conflict area *or* because multiple
+subsequent patches changed the same line (or lines) multiple times. In
+the latter case, you may have to run ``git blame`` again and specify the
+older version of the file to look at in order to dig further back in
+the history of the file.
+
+Prerequisite vs. incidental patches
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Having found the patch that caused the conflict, you need to determine
+whether it is a prerequisite for the patch you are backporting or
+whether it is just incidental and can be skipped. An incidental patch
+would be one that touches the same code as the patch you are
+backporting, but does not change the semantics of the code in any
+material way. For example, a whitespace cleanup patch is completely
+incidental -- likewise, a patch that simply renames a function or a
+variable would be incidental as well. On the other hand, if the function
+being changed does not even exist in your current branch then this would
+not be incidental at all and you need to carefully consider whether the
+patch adding the function should be cherry-picked first.
+
+If you find that there is a necessary prerequisite patch, then you need
+to stop and cherry-pick that instead. If you've already resolved some
+conflicts in a different file and don't want to do it again, you can
+create a temporary copy of that file.
+
+To abort the current cherry-pick, go ahead and run
+``git cherry-pick --abort``, then restart the cherry-picking process
+with the commit ID of the prerequisite patch instead.
+
+Understanding conflict markers
+------------------------------
+
+Combined diffs
+~~~~~~~~~~~~~~
+
+Let's say you've decided against picking (or reverting) additional
+patches and you just want to resolve the conflict. Git will have
+inserted conflict markers into your file. Out of the box, this will look
+something like::
+
+ <<<<<<< HEAD
+ this is what's in your current tree before cherry-picking
+ =======
+ this is what the patch wants it to be after cherry-picking
+ >>>>>>> <commit>... title
+
+This is what you would see if you opened the file in your editor.
+However, if you were to run run ``git diff`` without any arguments, the
+output would look something like this::
+
+ $ git diff
+ [...]
+ ++<<<<<<<< HEAD
+ +this is what's in your current tree before cherry-picking
+ ++========
+ + this is what the patch wants it to be after cherry-picking
+ ++>>>>>>>> <commit>... title
+
+When you are resolving a conflict, the behavior of ``git diff`` differs
+from its normal behavior. Notice the two columns of diff markers
+instead of the usual one; this is a so-called "`combined diff`_", here
+showing the 3-way diff (or diff-of-diffs) between
+
+#. the current branch (before cherry-picking) and the current working
+ directory, and
+#. the current branch (before cherry-picking) and the file as it looks
+ after the original patch has been applied.
+
+.. _combined diff: https://git-scm.com/docs/diff-format#_combined_diff_format
+
+
+Better diffs
+~~~~~~~~~~~~
+
+3-way combined diffs include all the other changes that happened to the
+file between your current branch and the branch you are cherry-picking
+from. While this is useful for spotting other changes that you need to
+take into account, this also makes the output of ``git diff`` somewhat
+intimidating and difficult to read. You may instead prefer to run
+``git diff HEAD`` (or ``git diff --ours``) which shows only the diff
+between the current branch before cherry-picking and the current working
+directory. It looks like this::
+
+ $ git diff HEAD
+ [...]
+ +<<<<<<<< HEAD
+ this is what's in your current tree before cherry-picking
+ +========
+ +this is what the patch wants it to be after cherry-picking
+ +>>>>>>>> <commit>... title
+
+As you can see, this reads just like any other diff and makes it clear
+which lines are in the current branch and which lines are being added
+because they are part of the merge conflict or the patch being
+cherry-picked.
+
+Merge styles and diff3
+~~~~~~~~~~~~~~~~~~~~~~
+
+The default conflict marker style shown above is known as the ``merge``
+style. There is also another style available, known as the ``diff3``
+style, which looks like this::
+
+ <<<<<<< HEAD
+ this is what is in your current tree before cherry-picking
+ ||||||| parent of <commit> (title)
+ this is what the patch expected to find there
+ =======
+ this is what the patch wants it to be after being applied
+ >>>>>>> <commit> (title)
+
+As you can see, this has 3 parts instead of 2, and includes what git
+expected to find there but didn't. Some people vastly prefer this style
+as it makes it much clearer what the patch actually changed; i.e., it
+allows you to compare the before-and-after versions of the file for the
+commit you are cherry-picking. This allows you to make better decisions
+about how to resolve the conflict.
+
+To change conflict marker styles, you can use the following command::
+
+ git config merge.conflictStyle diff3
+
+There is a third option, ``zdiff3``, introduced in `Git 2.35`_,
+which has the same 3 sections as ``diff3``, but where common lines have
+been trimmed off, making the conflict area smaller in some cases.
+
+.. _Git 2.35: https://github.blog/2022-01-24-highlights-from-git-2-35/
+
+Iterating on conflict resolutions
+---------------------------------
+
+The first step in any conflict resolution process is to understand the
+patch you are backporting. For the Linux kernel this is especially
+important, since an incorrect change can lead to the whole system
+crashing -- or worse, an undetected security vulnerability.
+
+Understanding the patch can be easy or difficult depending on the patch
+itself, the changelog, and your familiarity with the code being changed.
+However, a good question for every change (or every hunk of the patch)
+might be: "Why is this hunk in the patch?" The answers to these
+questions will inform your conflict resolution.
+
+Resolution process
+~~~~~~~~~~~~~~~~~~
+
+Sometimes the easiest thing to do is to just remove all but the first
+part of the conflict, leaving the file essentially unchanged, and apply
+the changes by hand. Perhaps the patch is changing a function call
+argument from ``0`` to ``1`` while a conflicting change added an
+entirely new (and insignificant) parameter to the end of the parameter
+list; in that case, it's easy enough to change the argument from ``0``
+to ``1`` by hand and leave the rest of the arguments alone. This
+technique of manually applying changes is mostly useful if the conflict
+pulled in a lot of unrelated context that you don't really need to care
+about.
+
+For particularly nasty conflicts with many conflict markers, you can use
+``git add`` or ``git add -i`` to selectively stage your resolutions to
+get them out of the way; this also lets you use ``git diff HEAD`` to
+always see what remains to be resolved or ``git diff --cached`` to see
+what your patch looks like so far.
+
+Function arguments
+~~~~~~~~~~~~~~~~~~
+
+Pay attention to changing function arguments! It's easy to gloss over
+details and think that two lines are the same but actually they differ
+in some small detail like which variable was passed as an argument
+(especially if the two variables are both a single character that look
+the same, like i and j).
+
+Error handling
+~~~~~~~~~~~~~~
+
+If you cherry-pick a patch that includes a ``goto`` statement (typically
+for error handling), it is absolutely imperative to double check that
+the target label is still correct in the branch you are backporting to.
+Error handling is typically located at the bottom of the function, so it
+may not be part of the conflict even though could have been changed by
+other patches.
+
+A good way to ensure that you review the error paths is to always use
+``git diff -W`` and ``git show -W`` (AKA ``--function-context``) when
+inspecting your changes. For C code, this will show you the whole
+function that's being changed in a patch. One of the things that often
+go wrong during backports is that something else in the function changed
+on either of the branches that you're backporting from or to. By
+including the whole function in the diff you get more context and can
+more easily spot problems that might otherwise go unnoticed.
+
+Dealing with file renames
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+One of the most annoying things that can happen while backporting a
+patch is discovering that one of the files being patched has been
+renamed, as that typically means git won't even put in conflict markers,
+but will just throw up its hands and say (paraphrased): "Unmerged path!
+You do the work..."
+
+There are generally a few ways to deal with this. If the patch to the
+renamed file is small, like a one-line change, the easiest thing is to
+just go ahead and apply the change by hand and be done with it. On the
+other hand, if the change is big or complicated, you definitely don't
+want to do it by hand.
+
+Sometimes the right thing to do will be to also backport the patch that
+did the rename, but that's definitely not the most common case. Instead,
+what you can do is to temporarily rename the file in the branch you're
+backporting to (using ``git mv`` and committing the result), restart the
+attempt to cherry-pick the patch, rename the file back (``git mv`` and
+committing again), and finally squash the result using ``git rebase -i``
+(see the `rebase tutorial`_) so it appears as a single commit when you
+are done.
+
+.. _rebase tutorial: https://medium.com/@slamflipstrom/a-beginners-guide-to-squashing-commits-wi…
+
+Verifying the result
+====================
+
+colordiff
+---------
+
+Having committed a conflict-free new patch, you can now compare your
+patch to the original patch. It is highly recommended that you use a
+tool such as `colordiff`_ that can show two files side by side and color
+them according to the changes between them::
+
+ colordiff -yw -W 200 <(git diff -W <upstream commit>^-) <(git diff -W HEAD^-) | less -SR
+
+.. _colordiff: https://www.colordiff.org/
+
+Here, ``-y`` means to do a side-by-side comparison; ``-w`` ignores
+whitespace, and ``-W 200`` sets the width of the output (as otherwise it
+will use 130 by default, which is often a bit too little).
+
+The ``rev^-`` syntax is a handy shorthand for ``rev^..rev``, essentially
+giving you just the diff for that single commit; also see
+the official `git rev-parse documentation`_.
+
+.. _git rev-parse documentation: https://git-scm.com/docs/git-rev-parse#_other_rev_parent_shorthand_notations
+
+Again, note the inclusion of ``-W`` for ``git diff``; this ensures that
+you will see the full function for any function that has changed.
+
+One incredibly important thing that colordiff does is to highlight lines
+that are different. For example, if an error-handling ``goto`` has
+changed labels between the original and backported patch, colordiff will
+show these side-by-side but highlighted in a different color. Thus, it
+is easy to see that the two ``goto`` statements are jumping to different
+labels. Likewise, lines that were not modified by either patch but
+differ in the context will also be highlighted and thus stand out during
+a manual inspection.
+
+Of course, this is just a visual inspection; the real test is building
+and running the patched kernel (or program).
+
+Build testing
+-------------
+
+We won't cover runtime testing here, but it can be a good idea to build
+just the files touched by the patch as a quick sanity check. For the
+Linux kernel you can build single files like this, assuming you have the
+``.config`` and build environment set up correctly::
+
+ make path/to/file.o
+
+Note that this won't discover linker errors, so you should still do a
+full build after verifying that the single file compiles. By compiling
+the single file first you can avoid having to wait for a full build *in
+case* there are compiler errors in any of the files you've changed.
+
+Runtime testing
+---------------
+
+Even a successful build or boot test is not necessarily enough to rule
+out a missing dependency somewhere. Even though the chances are small,
+there could be code changes where two independent changes to the same
+file result in no conflicts, no compile-time errors, and runtime errors
+only in exceptional cases.
+
+One concrete example of this was a pair of patches to the system call
+entry code where the first patch saved/restored a register and a later
+patch made use of the same register somewhere in the middle of this
+sequence. Since there was no overlap between the changes, one could
+cherry-pick the second patch, have no conflicts, and believe that
+everything was fine, when in fact the code was now scribbling over an
+unsaved register.
+
+Although the vast majority of errors will be caught during compilation
+or by superficially exercising the code, the only way to *really* verify
+a backport is to review the final patch with the same level of scrutiny
+as you would (or should) give to any other patch. Having unit tests and
+regression tests or other types of automatic testing can help increase
+the confidence in the correctness of a backport.
+
+Examples
+========
+
+The above shows roughly the idealized process of backporting a patch.
+For a more concrete example, see this video tutorial where two patches
+are backported from mainline to stable:
+`Backporting Linux Kernel Patches`_.
+
+.. _Backporting Linux Kernel Patches: https://youtu.be/sBR7R1V2FeA
diff --git a/Documentation/process/index.rst b/Documentation/process/index.rst
index b501cd977053f..13e522752f880 100644
--- a/Documentation/process/index.rst
+++ b/Documentation/process/index.rst
@@ -66,6 +66,7 @@ lack of a better place.
:maxdepth: 1
applying-patches
+ backporting
adding-syscalls
magic-number
volatile-considered-harmful
--
2.25.1
From: hackyzh002 <hackyzh002(a)gmail.com>
[ Upstream commit f828b681d0cd566f86351c0b913e6cb6ed8c7b9c ]
The type of size is unsigned, if size is 0x40000000, there will be an
integer overflow, size will be zero after size *= sizeof(uint32_t),
will cause uninitialized memory to be referenced later
Reviewed-by: Christian König <christian.koenig(a)amd.com>
Signed-off-by: hackyzh002 <hackyzh002(a)gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
drivers/gpu/drm/radeon/radeon_cs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index a78b60b62caf2..87a57e5588a28 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -271,7 +271,8 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
{
struct drm_radeon_cs *cs = data;
uint64_t *chunk_array_ptr;
- unsigned size, i;
+ u64 size;
+ unsigned i;
u32 ring = RADEON_CS_RING_GFX;
s32 priority = 0;
--
2.39.2