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Message-ID: <CACRpkdaAiF0=SCNBuOT7fyJwbHdMXMfBsRUiQEPnqWO-7nYz5A@mail.gmail.com>
Date: Mon, 28 Apr 2025 15:33:13 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Russell King <rmk+kernel@...linux.org.uk>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
"Paul E. McKenney" <paulmck@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: [GIT PULL] Generic entry for ARM for v6.16
Hi Russell,
please consider pulling the following git branch for ARM generic entry,
for v6.16 see below.
This branch is identical to the v6 patch series:
https://lore.kernel.org/linux-arm-kernel/20250420-arm-generic-entry-v6-0-95f1fcdfeeb2@linaro.org/
It's possible to squash patches, even all of them into one
big all-or-nothing patch, given the not very gradual nature generic
entry conversion seems to have.
Main upsides and downsides are in the signed tag.
This series contains the ACKs from tglx and paulmck.
What's new apart from rebasing is the two following remasks in the
signed tag:
- Makes it possible to move ahead with ARCH_WANTS_NO_INSTR.
- Good base for CONFIG_ARCH_HAS_RESCHED_LAZY which is a good
base for CONFIG_PREEMPT_RT.
I think Arnd may be working on this and this could be a good starting
point for PREEMPT_RT.
Yours,
Linus Walleij
The following changes since commit 0af2f6be1b4281385b618cb86ad946eded089ac8:
Linux 6.15-rc1 (2025-04-06 13:11:33 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git
tags/arm-generic-entry-for-v6.16
for you to fetch changes up to 8c259349fa675315e1a80a463b04803501a045f6:
ARM: entry: Reimplement local restart in C (2025-04-07 14:51:17 +0200)
----------------------------------------------------------------
Main upsides:
- Using the same common entry as used by x86_64, RISCV, S390
and Loongarch, probably soon also ARM64.
- Moves ARM away from the obsoleted context tracker entry points
user_enter_callable() and user_exit_callable() are now only used
by ARM, CSKY and Xtensa.
- Solves a few lockdep warnings in the process.
- Converts a bit of assembly into C.
- Makes it possible to move ahead with ARCH_WANTS_NO_INSTR.
- Good base for CONFIG_ARCH_HAS_RESCHED_LAZY which is a good
base for CONFIG_PREEMPT_RT.
Main downside:
- Slightly increased system call overhead, around 6% in
measurements.
----------------------------------------------------------------
Linus Walleij (32):
ARM: Switch to generic entry
ARM: Prepare includes for generic entry
ARM: ptrace: Split report_syscall()
ARM: entry: Skip ret_slow_syscall label
ARM: process: Rewrite ret_from_fork i C
ARM: process: Remove local restart
ARM: entry: Invoke syscalls using C
ARM: entry: Rewrite two asm calls in C
ARM: entry: Move trace entry to C function
ARM: entry: save the syscall sp in thread_info
ARM: entry: move all tracing invocation to C
ARM: entry: Merge the common and trace entry code
ARM: entry: Rename syscall invocation
ARM: entry: Create user_mode_enter/exit
ARM: entry: Drop trace argument from usr_entry macro
ARM: entry: Separate call path for syscall SWI entry
ARM: entry: Drop argument to asm_irqentry macros
ARM: entry: Implement syscall_exit_to_user_mode()
ARM: entry: Drop the superfast ret_fast_syscall
ARM: entry: Remove fast and offset register restore
ARM: entry: Untangle ret_fast_syscall/to_user
ARM: entry: Do not double-call exit functions
ARM: entry: Move work processing to C
ARM: entry: Stop exiting syscalls like IRQs
ARM: entry: Complete syscall and IRQ transition to C
ARM: entry: Create irqentry calls from kernel mode
ARM: entry: Move in-kernel hardirq tracing to C
ARM: irq: Add irqstack helper
ARM: entry: Convert to generic entry
ARM: entry: Handle dabt, pabt, and und as interrupts
ARM: entry: Block IRQs in early IRQ context
ARM: entry: Reimplement local restart in C
arch/arm/Kconfig | 1 +
arch/arm/include/asm/entry-common.h | 66 ++++++++++++
arch/arm/include/asm/entry.h | 14 +++
arch/arm/include/asm/ptrace.h | 8 +-
arch/arm/include/asm/signal.h | 4 -
arch/arm/include/asm/stacktrace.h | 2 +-
arch/arm/include/asm/switch_to.h | 4 +
arch/arm/include/asm/syscall.h | 7 ++
arch/arm/include/asm/thread_info.h | 22 ++--
arch/arm/include/asm/traps.h | 5 +-
arch/arm/include/uapi/asm/ptrace.h | 2 +
arch/arm/kernel/Makefile | 5 +-
arch/arm/kernel/asm-offsets.c | 1 +
arch/arm/kernel/entry-armv.S | 82 ++++-----------
arch/arm/kernel/entry-common.S | 198 +++++++++++++-----------------------
arch/arm/kernel/entry-header.S | 100 ++----------------
arch/arm/kernel/entry.c | 120 ++++++++++++++++++++++
arch/arm/kernel/irq.c | 6 ++
arch/arm/kernel/irq.h | 2 +
arch/arm/kernel/process.c | 25 ++++-
arch/arm/kernel/ptrace.c | 81 +--------------
arch/arm/kernel/signal.c | 68 +++----------
arch/arm/kernel/syscall.c | 59 +++++++++++
arch/arm/kernel/traps.c | 30 +-----
arch/arm/mm/abort-ev4.S | 2 +-
arch/arm/mm/abort-ev4t.S | 2 +-
arch/arm/mm/abort-ev5t.S | 4 +-
arch/arm/mm/abort-ev5tj.S | 6 +-
arch/arm/mm/abort-ev6.S | 2 +-
arch/arm/mm/abort-ev7.S | 2 +-
arch/arm/mm/abort-lv4t.S | 36 +++----
arch/arm/mm/abort-macro.S | 2 +-
arch/arm/mm/abort-nommu.S | 2 +-
arch/arm/mm/fault.c | 4 +-
arch/arm/mm/fault.h | 8 +-
arch/arm/mm/pabort-legacy.S | 2 +-
arch/arm/mm/pabort-v6.S | 2 +-
arch/arm/mm/pabort-v7.S | 2 +-
38 files changed, 484 insertions(+), 504 deletions(-)
create mode 100644 arch/arm/include/asm/entry-common.h
create mode 100644 arch/arm/include/asm/entry.h
create mode 100644 arch/arm/kernel/entry.c
create mode 100644 arch/arm/kernel/irq.h
create mode 100644 arch/arm/kernel/syscall.c
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