From: Kees Cook <keescook@chromium.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Borislav Petkov <bp@suse.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Mark Rutland <mark.rutland@arm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Palmer Dabbelt <palmerdabbelt@google.com>
Subject: [GIT PULL] cpu-to-thread_info update for v5.16-rc1
Date: Mon, 1 Nov 2021 09:12:01 -0700 [thread overview]
Message-ID: <202111010908.CA1B15CFDA@keescook> (raw)
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
next reply other threads:[~2021-11-01 16:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-01 16:12 Kees Cook [this message]
2021-11-02 0:51 ` [GIT PULL] cpu-to-thread_info update for v5.16-rc1 pr-tracker-bot
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