linux-kernel - [GIT PULL] cpu-to-thread

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Message-ID: <202111010908.CA1B15CFDA@keescook>
Date:   Mon, 1 Nov 2021 09:12:01 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: [GIT PULL] cpu-to-thread_info update for v5.16-rc1

Hi Linus,

Please pull this cpu-to-thread_info update for v5.16-rc1. Since I've
tended to carry other cross-architecture changes in the past, and mpe
wanted a stable topic branch for powerpc for this, I carried Ard's PR.
Since it was a stable topic branch and I wanted to capture Ard's summary,
it also includes an explicit Merge commit; please let me know if that
shouldn't be done in the future. This has been in -next for most of the
last cycle, and has been Acked by all the arch maintainers.

Thanks!

-Kees

The following changes since commit e4e737bb5c170df6135a127739a9e6148ee3da82:

  Linux 5.15-rc2 (2021-09-19 17:28:22 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git tags/cpu-to-thread_info-v5.16-rc1

for you to fetch changes up to d9f2a53f64a6fcae994457e64a7124d2a3efd323:

  Merge tag 'pr-move-task-cpu-to-ti' of git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git (2021-09-30 10:36:44 -0700)

----------------------------------------------------------------
cpu-to-thread_info update for v5.16-rc1

Cross-architecture update to move task_struct::cpu back into thread_info
on arm64, x86, s390, powerpc, and riscv. All Acked by arch maintainers.

Quoting Ard Biesheuvel:

"Move task_struct::cpu back into thread_info

 Keeping CPU in task_struct is problematic for architectures that define
 raw_smp_processor_id() in terms of this field, as it requires
 linux/sched.h to be included, which causes a lot of pain in terms of
 circular dependencies (aka 'header soup')

 This series moves it back into thread_info (where it came from) for all
 architectures that enable THREAD_INFO_IN_TASK, addressing the header
 soup issue as well as some pointless differences in the implementations
 of task_cpu() and set_task_cpu()."

----------------------------------------------------------------
Ard Biesheuvel (7):
      arm64: add CPU field to struct thread_info
      x86: add CPU field to struct thread_info
      s390: add CPU field to struct thread_info
      powerpc: add CPU field to struct thread_info
      sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y
      powerpc: smp: remove hack to obtain offset of task_struct::cpu
      riscv: rely on core code to keep thread_info::cpu updated

Kees Cook (1):
      Merge tag 'pr-move-task-cpu-to-ti' of git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git

 arch/arm64/include/asm/thread_info.h   |  1 +
 arch/arm64/kernel/asm-offsets.c        |  2 +-
 arch/arm64/kernel/head.S               |  2 +-
 arch/powerpc/Makefile                  | 11 -----------
 arch/powerpc/include/asm/smp.h         | 17 +----------------
 arch/powerpc/include/asm/thread_info.h |  3 +++
 arch/powerpc/kernel/asm-offsets.c      |  4 +---
 arch/powerpc/kernel/smp.c              |  2 +-
 arch/riscv/kernel/asm-offsets.c        |  1 -
 arch/riscv/kernel/entry.S              |  5 -----
 arch/riscv/kernel/head.S               |  1 -
 arch/s390/include/asm/thread_info.h    |  1 +
 arch/x86/include/asm/thread_info.h     |  3 +++
 include/linux/sched.h                  | 13 +------------
 kernel/sched/sched.h                   |  4 ----
 15 files changed, 14 insertions(+), 56 deletions(-)

-- 
Kees Cook