linux.git/Documentation/features/locking, branch v5.18 Clone of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git nds32: Remove the architecture 2022-03-07T12:54:59+00:00 Alan Kao alankao@andestech.com 2022-03-02T07:42:45+00:00 aec499c75cf8e0b599be4d559e6922b613085f8f The nds32 architecture, also known as AndeStar V3, is a custom 32-bit RISC target designed by Andes Technologies. Support was added to the kernel in 2016 as the replacement RISC-V based V5 processors were already announced, and maintained by (current or former) Andes employees. As explained by Alan Kao, new customers are now all using RISC-V, and all known nds32 users are already on longterm stable kernels provided by Andes, with no development work going into mainline support any more. While the port is still in a reasonably good shape, it only gets worse over time without active maintainers, so it seems best to remove it before it becomes unusable. As always, if it turns out that there are mainline users after all, and they volunteer to maintain the port in the future, the removal can be reverted. Link: https://lore.kernel.org/linux-mm/YhdWNLUhk+x9RAzU@yamatobi.andestech.com/ Link: https://lore.kernel.org/lkml/20220302065213.82702-1-alankao@andestech.com/ Link: https://www.andestech.com/en/products-solutions/andestar-architecture/ Signed-off-by: Alan Kao <alankao@andestech.com> [arnd: rewrite changelog to provide more background] Signed-off-by: Arnd Bergmann <arnd@arndb.de> 
The nds32 architecture, also known as AndeStar V3, is a custom 32-bit
RISC target designed by Andes Technologies. Support was added to the
kernel in 2016 as the replacement RISC-V based V5 processors were
already announced, and maintained by (current or former) Andes
employees.

As explained by Alan Kao, new customers are now all using RISC-V,
and all known nds32 users are already on longterm stable kernels
provided by Andes, with no development work going into mainline
support any more.

While the port is still in a reasonably good shape, it only gets
worse over time without active maintainers, so it seems best
to remove it before it becomes unusable. As always, if it turns
out that there are mainline users after all, and they volunteer
to maintain the port in the future, the removal can be reverted.

Link: https://lore.kernel.org/linux-mm/YhdWNLUhk+x9RAzU@yamatobi.andestech.com/
Link: https://lore.kernel.org/lkml/20220302065213.82702-1-alankao@andestech.com/
Link: https://www.andestech.com/en/products-solutions/andestar-architecture/
Signed-off-by: Alan Kao <alankao@andestech.com>
[arnd: rewrite changelog to provide more background]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Documentation: features: remove c6x references 2021-02-25T18:25:57+00:00 Arnd Bergmann arnd@arndb.de 2021-02-25T14:27:17+00:00 4f3c8320c78cdd11c8fdd23c33787407f719322e The references to arch/c6x are obsolete now that the architecture is gone. Remove them. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20210225142841.3385428-1-arnd@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
The references to arch/c6x are obsolete now that the architecture
is gone. Remove them.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210225142841.3385428-1-arnd@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Documentation/features: Update feature lists for 5.10 2020-11-30T17:41:33+00:00 Wei Li liwei391@huawei.com 2020-11-19T02:27:09+00:00 f59c4966d8508671ae3a990396a9da91f85ad75b The feature lists don't match reality as of v5.10-rc4, update them accordingly (by features-refresh.sh). Signed-off-by: Wei Li <liwei391@huawei.com> Link: https://lore.kernel.org/r/20201119022709.45843-1-liwei391@huawei.com Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
The feature lists don't match reality as of v5.10-rc4, update them
accordingly (by features-refresh.sh).

Signed-off-by: Wei Li <liwei391@huawei.com>
Link: https://lore.kernel.org/r/20201119022709.45843-1-liwei391@huawei.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Merge tag 'docs-5.9-2' of git://git.lwn.net/linux 2020-08-13T20:57:45+00:00 Linus Torvalds torvalds@linux-foundation.org 2020-08-13T20:57:45+00:00 dddcbc139e96bd18d8c65ef7b7e440f0d32457c2 Pull documentation fixes from Jonathan Corbet: "A handful of obvious fixes that wandered in during the merge window" * tag 'docs-5.9-2' of git://git.lwn.net/linux: Documentation/locking/locktypes: fix the typo doc/zh_CN: resolve undefined label warning in admin-guide index doc/zh_CN: fix title heading markup in admin-guide cpu-load docs: remove the 2.6 "Upgrading I2C Drivers" guide docs: Correct the release date of 5.2 stable mailmap: Update comments for with format and more detalis docs: cdrom: Fix a typo and rst markup Doc: admin-guide: use correct legends in kernel-parameters.txt Documentation/features: refresh RISC-V arch support files documentation: coccinelle: Improve command example for make C={1,2} Core-api: Documentation: Replace deprecated :c:func: Usage Dev-tools: Documentation: Replace deprecated :c:func: Usage Filesystems: Documentation: Replace deprecated :c:func: Usage docs: trace: fix a typo 
Pull documentation fixes from Jonathan Corbet:
 "A handful of obvious fixes that wandered in during the merge window"

* tag 'docs-5.9-2' of git://git.lwn.net/linux:
  Documentation/locking/locktypes: fix the typo
  doc/zh_CN: resolve undefined label warning in admin-guide index
  doc/zh_CN: fix title heading markup in admin-guide cpu-load
  docs: remove the 2.6 "Upgrading I2C Drivers" guide
  docs: Correct the release date of 5.2 stable
  mailmap: Update comments for with format and more detalis
  docs: cdrom: Fix a typo and rst markup
  Doc: admin-guide: use correct legends in kernel-parameters.txt
  Documentation/features: refresh RISC-V arch support files
  documentation: coccinelle: Improve command example for make C={1,2}
  Core-api: Documentation: Replace deprecated :c:func: Usage
  Dev-tools: Documentation: Replace deprecated :c:func: Usage
  Filesystems: Documentation: Replace deprecated :c:func: Usage
  docs: trace: fix a typo
Documentation/features: refresh RISC-V arch support files 2020-08-11T16:39:21+00:00 Tobias Klauser tklauser@distanz.ch 2020-08-10T09:50:00+00:00 f30c3ff3f0e8305d6c1a210df6d588a13333b8f7 Support for these was added by the following commits: f2c9699f6555 ("riscv: Add STACKPROTECTOR supported") 3c4697982982 ("riscv: Enable LOCKDEP_SUPPORT & fixup TRACE_IRQFLAGS_SUPPORT"). ed48b297fe21 ("riscv: Enable context tracking") cbb3d91d3bcf ("riscv: Add kmemleak support") Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Link: https://lore.kernel.org/r/20200810095000.32092-1-tklauser@distanz.ch Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
Support for these was added by the following commits:

  f2c9699f6555 ("riscv: Add STACKPROTECTOR supported")
  3c4697982982 ("riscv: Enable LOCKDEP_SUPPORT & fixup TRACE_IRQFLAGS_SUPPORT").
  ed48b297fe21 ("riscv: Enable context tracking")
  cbb3d91d3bcf ("riscv: Add kmemleak support")

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Link: https://lore.kernel.org/r/20200810095000.32092-1-tklauser@distanz.ch
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
arch: remove unicore32 port 2020-07-01T09:09:13+00:00 Mike Rapoport rppt@linux.ibm.com 2020-06-10T06:45:20+00:00 fb37409a01b011a664347702f44dbf13fa7c7486 The unicore32 port do not seem maintained for a long time now, there is no upstream toolchain that can create unicore32 binaries and all the links to prebuilt toolchains for unicore32 are dead. Even compilers that were available are not supported by the kernel anymore. Guenter Roeck says: I have stopped building unicore32 images since v4.19 since there is no available compiler that is still supported by the kernel. I am surprised that support for it has not been removed from the kernel. Remove unicore32 port. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Guenter Roeck <linux@roeck-us.net> 
The unicore32 port do not seem maintained for a long time now, there is no
upstream toolchain that can create unicore32 binaries and all the links to
prebuilt toolchains for unicore32 are dead. Even compilers that were
available are not supported by the kernel anymore.

Guenter Roeck says:

  I have stopped building unicore32 images since v4.19 since there is no
  available compiler that is still supported by the kernel. I am surprised
  that support for it has not been removed from the kernel.

Remove unicore32 port.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Documentation/features: Refresh the arch support status files 2020-05-25T16:17:11+00:00 Björn Töpel bjorn.topel@gmail.com 2020-05-23T19:11:35+00:00 75a49a5e4f92d38d99b1d6b24cf9bbf0a6c05791 I was manually editing the arch-support.txt for eBPF-JIT, when I realized the refresh script [1] has not been run for a while. Let's fix that, so that the entries are more up-to-date. [1] Documentation/features/scripts/features-refresh.sh Signed-off-by: Björn Töpel <bjorn.topel@gmail.com> Link: https://lore.kernel.org/r/20200523191135.21889-1-bjorn.topel@gmail.com Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
I was manually editing the arch-support.txt for eBPF-JIT, when I
realized the refresh script [1] has not been run for a while. Let's
fix that, so that the entries are more up-to-date.

[1] Documentation/features/scripts/features-refresh.sh

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Link: https://lore.kernel.org/r/20200523191135.21889-1-bjorn.topel@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Documentation/features/locking: update lists 2019-07-30T20:18:43+00:00 Mark Rutland mark.rutland@arm.com 2019-07-23T13:22:03+00:00 da422ade5c879355f7410859069ef4f957c303d4 The locking feature lists don't match reality as of v5.3-rc1: * arm64 moved to queued spinlocks in commit: c11090474d70590170cf5fa6afe85864ab494b37 ("arm64: locking: Replace ticket lock implementation with qspinlock") * xtensa moved to queued spinlocks and rwlocks in commit: 579afe866f52adcd921272a224ab36733051059c ("xtensa: use generic spinlock/rwlock implementation") * architecture-specific rwsem support was removed in commit: 46ad0840b1584b92b5ff2cc3ed0b011dd6b8e0f1 ("locking/rwsem: Remove arch specific rwsem files") So update the feature lists accordingly, and remove the now redundant rwsem-optimized list. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
The locking feature lists don't match reality as of v5.3-rc1:

* arm64 moved to queued spinlocks in commit:
  c11090474d70590170cf5fa6afe85864ab494b37
  ("arm64: locking: Replace ticket lock implementation with qspinlock")

* xtensa moved to queued spinlocks and rwlocks in commit:
  579afe866f52adcd921272a224ab36733051059c
  ("xtensa: use generic spinlock/rwlock implementation")

* architecture-specific rwsem support was removed in commit:
  46ad0840b1584b92b5ff2cc3ed0b011dd6b8e0f1
  ("locking/rwsem: Remove arch specific rwsem files")

So update the feature lists accordingly, and remove the now redundant
rwsem-optimized list.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Documentation/features: Add csky kernel features 2019-01-07T14:22:16+00:00 Guo Ren ren_guo@c-sky.com 2019-01-04T03:17:33+00:00 8a5aaf97cc4876a9b61cb3b7c07128d4569ac536 core/ cBPF-JIT : TODO | core/ eBPF-JIT : TODO | core/ generic-idle-thread : ok | core/ jump-labels : TODO | core/ tracehook : ok | debug/ KASAN : TODO | debug/ gcov-profile-all : TODO | debug/ kgdb : TODO | debug/ kprobes-on-ftrace : TODO | debug/ kprobes : TODO | debug/ kretprobes : TODO | debug/ optprobes : TODO | debug/ stackprotector : TODO | debug/ uprobes : TODO | debug/ user-ret-profiler : TODO | io/ dma-contiguous : ok | locking/ cmpxchg-local : TODO | locking/ lockdep : TODO | locking/ queued-rwlocks : ok | locking/ queued-spinlocks : TODO | locking/ rwsem-optimized : TODO | perf/ kprobes-event : TODO | perf/ perf-regs : TODO | perf/ perf-stackdump : TODO | sched/ membarrier-sync-core : TODO | sched/ numa-balancing : .. | seccomp/ seccomp-filter : TODO | time/ arch-tick-broadcast : TODO | time/ clockevents : ok | time/ context-tracking : TODO | time/ irq-time-acct : TODO | time/ modern-timekeeping : ok | time/ virt-cpuacct : TODO | vm/ ELF-ASLR : TODO | vm/ PG_uncached : TODO | vm/ THP : .. | vm/ batch-unmap-tlb-flush: TODO | vm/ huge-vmap : TODO | vm/ ioremap_prot : TODO | vm/ numa-memblock : .. | vm/ pte_special : TODO | Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de> 
      core/ cBPF-JIT             : TODO |
      core/ eBPF-JIT             : TODO |
      core/ generic-idle-thread  :  ok  |
      core/ jump-labels          : TODO |
      core/ tracehook            :  ok  |
     debug/ KASAN                : TODO |
     debug/ gcov-profile-all     : TODO |
     debug/ kgdb                 : TODO |
     debug/ kprobes-on-ftrace    : TODO |
     debug/ kprobes              : TODO |
     debug/ kretprobes           : TODO |
     debug/ optprobes            : TODO |
     debug/ stackprotector       : TODO |
     debug/ uprobes              : TODO |
     debug/ user-ret-profiler    : TODO |
        io/ dma-contiguous       :  ok  |
   locking/ cmpxchg-local        : TODO |
   locking/ lockdep              : TODO |
   locking/ queued-rwlocks       :  ok  |
   locking/ queued-spinlocks     : TODO |
   locking/ rwsem-optimized      : TODO |
      perf/ kprobes-event        : TODO |
      perf/ perf-regs            : TODO |
      perf/ perf-stackdump       : TODO |
     sched/ membarrier-sync-core : TODO |
     sched/ numa-balancing       :  ..  |
   seccomp/ seccomp-filter       : TODO |
      time/ arch-tick-broadcast  : TODO |
      time/ clockevents          :  ok  |
      time/ context-tracking     : TODO |
      time/ irq-time-acct        : TODO |
      time/ modern-timekeeping   :  ok  |
      time/ virt-cpuacct         : TODO |
        vm/ ELF-ASLR             : TODO |
        vm/ PG_uncached          : TODO |
        vm/ THP                  :  ..  |
        vm/ batch-unmap-tlb-flush: TODO |
        vm/ huge-vmap            : TODO |
        vm/ ioremap_prot         : TODO |
        vm/ numa-memblock        :  ..  |
        vm/ pte_special          : TODO |

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Documentation/features/locking: Use '!RWSEM_GENERIC_SPINLOCK' as Kconfig for 'rwsem-optimized' 2018-05-08T15:28:25+00:00 Andrea Parri andrea.parri@amarulasolutions.com 2018-05-07T10:43:41+00:00 0ca2840ff52d25dab84cb688f9f020a005e7dc81 Uses '!RWSEM_GENERIC_SPINLOCK' in place of 'Optimized asm/rwsem.h' as Kconfig for 'rwsem-optimized': the new Kconfig expresses this feature equivalently, while also enabling the script 'features-refresh.sh' to operate on the corresponding arch support status file. Also refreshes the status matrix by using the script 'features-refresh.sh'. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> 
Uses '!RWSEM_GENERIC_SPINLOCK' in place of 'Optimized asm/rwsem.h' as
Kconfig for 'rwsem-optimized': the new Kconfig expresses this feature
equivalently, while also enabling the script 'features-refresh.sh' to
operate on the corresponding arch support status file. Also refreshes
the status matrix by using the script 'features-refresh.sh'.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>