linux.git/Documentation/features/core, branch v6.18.21 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Merge tag 'for-linus' of https://github.com/openrisc/linux 2025-10-05T17:02:54+00:00 Linus Torvalds torvalds@linux-foundation.org 2025-10-05T17:02:54+00:00 742adaa16db994ba1748465b95548e2f28aa18ca Pull OpenRISC updates from Stafford Horne: "I picked up one series from Chen Miao, our Google Summer of Code contributor, which adds OpenRISC support for static keys" * tag 'for-linus' of https://github.com/openrisc/linux: openrisc: Add jump label support openrisc: Regenerate defconfigs. openrisc: Add R_OR1K_32_PCREL relocation type module support openrisc: Add text patching API support 
Pull OpenRISC updates from Stafford Horne:
 "I picked up one series from Chen Miao, our Google Summer of Code
  contributor, which adds OpenRISC support for static keys"

* tag 'for-linus' of https://github.com/openrisc/linux:
  openrisc: Add jump label support
  openrisc: Regenerate defconfigs.
  openrisc: Add R_OR1K_32_PCREL relocation type module support
  openrisc: Add text patching API support
Documentation/features: Update feature lists for 6.17-rc7 2025-09-25T17:17:56+00:00 Lukas Bulwahn lukas.bulwahn@redhat.com 2025-09-25T07:36:34+00:00 99510c324e531addd9f7b80a72dab7435ca66215 It seems that ./Documentation/features/scripts/features-refresh.sh was most recently used in December 2022, with the latest kernel release v6.1-rc7 at that time (see commit 7f2e60ff51ca ("Documentation/features: Update feature lists for 6.1") to update the feature lists in this subdirectory. All further changes to Documentation/features/ since then have probably been done manually, without checking for changes in other architectures and features, that missed to update this part of the documentation. Running ./Documentation/features/scripts/features-refresh.sh now showed seven changes of supported features in various architectures (one in arc, two in parisc, one in riscv, one in openrisc, and two in um), which were not reflected yet in the current documentation. To confirm the sanity of this script's suggested changes, I checked if the commit messages confirm that the features have in fact been added in the following commits: - commit f122668ddcce ("ARC: Add eBPF JIT support") - commit 4800a6215e33 ("parisc: Wire up eBPF JIT compiler") - commit a869b8c29f86 ("riscv: enable mseal sysmap for RV64") - commit 2f681ba4b352 ("um: move thread info into task") - commit 3f17fed21491 ("um: switch to regset API and depend on XSTATE") - commit 7ce8716e2769 ("openrisc: Add HAVE_REGS_AND_STACK_ACCESS_API support") - commit b5ff52be8913 ("parisc: Convert to generic clockevents") So, update all documents to the current state with features-refresh.sh. Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20250925073634.112142-1-lukas.bulwahn@redhat.com> 
It seems that ./Documentation/features/scripts/features-refresh.sh was most
recently used in December 2022, with the latest kernel release v6.1-rc7 at
that time (see commit 7f2e60ff51ca ("Documentation/features: Update feature
lists for 6.1") to update the feature lists in this subdirectory. All
further changes to Documentation/features/ since then have probably been
done manually, without checking for changes in other architectures and
features, that missed to update this part of the documentation.

Running ./Documentation/features/scripts/features-refresh.sh now showed
seven changes of supported features in various architectures (one in arc,
two in parisc, one in riscv, one in openrisc, and two in um), which were
not reflected yet in the current documentation.

To confirm the sanity of this script's suggested changes, I checked if the
commit messages confirm that the features have in fact been added in the
following commits:

  - commit f122668ddcce ("ARC: Add eBPF JIT support")
  - commit 4800a6215e33 ("parisc: Wire up eBPF JIT compiler")
  - commit a869b8c29f86 ("riscv: enable mseal sysmap for RV64")
  - commit 2f681ba4b352 ("um: move thread info into task")
  - commit 3f17fed21491 ("um: switch to regset API and depend on XSTATE")
  - commit 7ce8716e2769 ("openrisc: Add HAVE_REGS_AND_STACK_ACCESS_API support")
  - commit b5ff52be8913 ("parisc: Convert to generic clockevents")

So, update all documents to the current state with features-refresh.sh.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250925073634.112142-1-lukas.bulwahn@redhat.com>
openrisc: Add jump label support 2025-09-11T10:27:59+00:00 chenmiao chenmiao.ku@gmail.com 2025-09-05T18:12:58+00:00 8c30b0018f9d93391573e091960d257fd9de120a Supported a complete jump_label implementation based on the ARM64 and RV64 version and add the CONFIG_JUMP_LABEL=y to the defconfig. Testing was conducted using a dedicated test module jump-label-test, provided in the link below. For detailed steps, please refer to the README also at the provided link. Link: https://github.com/ChenMiaoi/GSoC-2025-Final-Report/tree/main/tests/jump-label-test Test Environment: - Hardware: QEMU emulated OR1K - Kernel Version: 6.17.0-rc3-dirty - Configs: CONFIG_MODULES=y,CONFIG_MODULE_UNLOAD=y - Toolchain: or1k-none-linux-musl-gcc 15.1.0 Test Results: $ insmod jump_label_test.ko [ 32.590000] Jump label performance test module loaded [ 35.250000] Normal branch time: 1241327150 ns (124 ns per iteration) [ 35.250000] Jump label (false) time: 706422700 ns (70 ns per iteration) [ 35.250000] Jump label (true) time: 708913450 ns (70 ns per iteration) $ rmmod jump_label_test.ko [ 72.210000] Jump label test module unloaded The results show approximately 43% improvement in branch performance when using jump labels compared to traditional branches. Link: https://lore.kernel.org/openrisc/aLsZ9S3X0OpKy1RM@antec/T/#u Signed-off-by: chenmiao <chenmiao.ku@gmail.com> Signed-off-by: Stafford Horne <shorne@gmail.com> 
Supported a complete jump_label implementation based on the ARM64 and
RV64 version and add the CONFIG_JUMP_LABEL=y to the defconfig.

Testing was conducted using a dedicated test module jump-label-test,
provided in the link below. For detailed steps, please refer to the
README also at the provided link.

Link: https://github.com/ChenMiaoi/GSoC-2025-Final-Report/tree/main/tests/jump-label-test

Test Environment:
  - Hardware: QEMU emulated OR1K
  - Kernel Version: 6.17.0-rc3-dirty
  - Configs: CONFIG_MODULES=y,CONFIG_MODULE_UNLOAD=y
  - Toolchain: or1k-none-linux-musl-gcc 15.1.0

Test Results:
$ insmod jump_label_test.ko
[   32.590000] Jump label performance test module loaded
[   35.250000] Normal branch time: 1241327150 ns (124 ns per iteration)
[   35.250000] Jump label (false) time: 706422700 ns (70 ns per iteration)
[   35.250000] Jump label (true) time: 708913450 ns (70 ns per iteration)
$ rmmod jump_label_test.ko
[   72.210000] Jump label test module unloaded

The results show approximately 43% improvement in branch performance
when using jump labels compared to traditional branches.

Link: https://lore.kernel.org/openrisc/aLsZ9S3X0OpKy1RM@antec/T/#u
Signed-off-by: chenmiao <chenmiao.ku@gmail.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
LoongArch: Enable ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS 2025-05-30T13:45:42+00:00 Yuli Wang wangyuli@uniontech.com 2025-05-30T13:45:42+00:00 b37981ce540dffa64a4664ccf0e20dbef6c2c638 Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on LoongArch, covering the vdso. Link: https://lore.kernel.org/all/25bad37f-273e-4626-999c-e1890be96182@lucifer.local/ Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Jeff Xu <jeffxu@chromium.org> Tested-by: Yuli Wang <wangyuli@uniontech.com> Signed-off-by: Yuli Wang <wangyuli@uniontech.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on LoongArch, covering
the vdso.

Link: https://lore.kernel.org/all/25bad37f-273e-4626-999c-e1890be96182@lucifer.local/
Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Jeff Xu <jeffxu@chromium.org>
Tested-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
mseal sysmap: add arch-support txt 2025-04-01T22:17:17+00:00 Jeff Xu jeffxu@chromium.org 2025-03-21T03:26:27+00:00 e20706d5385b10a6f6a2fe5ad6b1333dad2d1416 Add Documentation/features/core/mseal_sys_mappings/arch-support.txt N/A: the arch is 32bits only and mseal is not supported in 32 bits, therefore N/A (until mseal is available in 32 bits kernel). [jeffxu@chromium.org: update to v3] Link: https://lkml.kernel.org/r/20250324151537.1106542-2-jeffxu@google.com Link: https://lkml.kernel.org/r/20250321032627.4147562-2-jeffxu@google.com Signed-off-by: Jeff Xu <jeffxu@chromium.org> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Eric Dumaze <edumazet@google.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: guoweikang <guoweikang.kernel@gmail.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Meghana Malladi <m-malladi@ti.com> Cc: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> 
Add Documentation/features/core/mseal_sys_mappings/arch-support.txt

N/A: the arch is 32bits only and mseal is not supported in 32 bits,
     therefore N/A (until mseal is available in 32 bits kernel).

[jeffxu@chromium.org: update to v3]
  Link: https://lkml.kernel.org/r/20250324151537.1106542-2-jeffxu@google.com
Link: https://lkml.kernel.org/r/20250321032627.4147562-2-jeffxu@google.com
Signed-off-by: Jeff Xu <jeffxu@chromium.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Eric Dumaze <edumazet@google.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: guoweikang <guoweikang.kernel@gmail.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Meghana Malladi <m-malladi@ti.com>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Documentation: Drop IA64 from feature descriptions 2023-09-11T08:13:18+00:00 Ard Biesheuvel ardb@kernel.org 2023-01-13T17:07:28+00:00 af1f459233d4edeef634f559539e7f4b64cb1d25 Itanium (IA64) is going away, so drop it from the kernel feature documentation. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> 
Itanium (IA64) is going away, so drop it from the kernel feature
documentation.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Documentation: Fix typos 2023-08-18T17:29:03+00:00 Bjorn Helgaas bhelgaas@google.com 2023-08-14T21:28:22+00:00 d56b699d76d1b352f7a3d3a0a3e91c79b8612d94 Fix typos in Documentation. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/20230814212822.193684-4-helgaas@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
Fix typos in Documentation.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20230814212822.193684-4-helgaas@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
LoongArch: Add jump-label implementation 2023-06-29T12:58:44+00:00 Youling Tang tangyouling@loongson.cn 2023-06-29T12:58:44+00:00 f02644e32c9e4bd1a9b286dc0b84f9cbe294f4e2 Add support for jump labels based on the ARM64 version. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Add support for jump labels based on the ARM64 version.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Documentation/features: Use loongarch instead of loong 2022-12-05T09:50:12+00:00 Tiezhu Yang yangtiezhu@loongson.cn 2022-12-04T12:18:47+00:00 cc8c418b4fc09ed58ddd27b8e90ec797e9ca1e67 The official arch name is LoongArch [1], we should use small letter loongarch instead of loong in Documentation/features, just use the features-refresh.sh to refresh all the related files. [1] https://www.kernel.org/doc/html/latest/loongarch/index.html Fixes: 5860800e8696 ("Documentation/features: Update the arch support status files") Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Link: https://lore.kernel.org/r/1670156327-9631-3-git-send-email-yangtiezhu@loongson.cn Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
The official arch name is LoongArch [1], we should use small letter
loongarch instead of loong in Documentation/features, just use the
features-refresh.sh to refresh all the related files.

[1] https://www.kernel.org/doc/html/latest/loongarch/index.html

Fixes: 5860800e8696 ("Documentation/features: Update the arch support status files")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Link: https://lore.kernel.org/r/1670156327-9631-3-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Documentation/features: Update feature lists for 6.1 2022-12-03T10:54:20+00:00 Wei Li liwei391@huawei.com 2022-12-03T09:37:50+00:00 7f2e60ff51caf511b9215e0b9fc47ee620ecbb66 Run the refresh script to document the recent feature additions on loong, um and csky as of v6.1-rc7. Signed-off-by: Wei Li <liwei391@huawei.com> Link: https://lore.kernel.org/r/20221203093750.4145802-1-liwei391@huawei.com Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
Run the refresh script to document the recent feature additions
on loong, um and csky as of v6.1-rc7.

Signed-off-by: Wei Li <liwei391@huawei.com>
Link: https://lore.kernel.org/r/20221203093750.4145802-1-liwei391@huawei.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>