[PATCH v2 00/12] ARM: ftrace fixes and cleanups

From: Ard Biesheuvel <ardb@kernel.org>
To: linux@armlinux.org.uk
Cc: linux-arm-kernel@lists.infradead.org,
	Ard Biesheuvel <ardb@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Cristian Marussi <cristian.marussi@arm.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Linus Walleij <linus.walleij@linaro.org>,
	Masami Hiramatsu <mhiramat@kernel.org>
Subject: [PATCH v2 00/12] ARM: ftrace fixes and cleanups
Date: Mon, 31 Jan 2022 18:03:35 +0100	[thread overview]
Message-ID: <20220131170347.381551-1-ardb@kernel.org> (raw)

This series addresses a number of issues in the ARM support code for
ftrace, mostly related to Thumb2 but affecting other configurations as
well.

Changes since v1:
- add a couple of patches to enable ftrace in Thumb2 mode when building
  with Clang, which was the one remaining unsupported configuration
- fix up some minor code issues caught by the bots
- add some acks

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Cristian Marussi <cristian.marussi@arm.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>

Ard Biesheuvel (12):
  ARM: ftrace: ensure that ADR take Thumb bit into account
  ARM: ftrace: use ADD not POP to counter PUSH at entry
  ARM: ftrace: use trampolines to keep .init.text in branching range
  ARM: ftrace: avoid redundant loads or clobbering IP
  ARM: ftrace: avoid unnecessary literal loads
  ARM: ftrace: enable HAVE_FUNCTION_GRAPH_FP_TEST
  ARM: unwind: track location of LR value in stack frame
  ARM: ftrace: enable the graph tracer with the EABI unwinder
  ARM: kprobes: treat R7 as the frame pointer register in Thumb2 builds
  drivers/firmware/scmi: disable ftrace for Clang Thumb2 builds
  ARM: cacheflush: avoid clobbering the frame pointer in Thumb2 mode
  Revert "ARM: 9144/1: forbid ftrace with clang and thumb2_kernel"

 arch/arm/Kconfig                         |   4 +-
 arch/arm/Kconfig.debug                   |   2 +-
 arch/arm/include/asm/cacheflush.h        |   7 +-
 arch/arm/include/asm/ftrace.h            |  20 +--
 arch/arm/include/asm/opcodes.h           |  14 +++
 arch/arm/include/asm/stacktrace.h        |   3 +
 arch/arm/kernel/Makefile                 |   6 +-
 arch/arm/kernel/entry-ftrace.S           | 128 +++++++++++---------
 arch/arm/kernel/ftrace.c                 |  51 ++++++--
 arch/arm/kernel/unwind.c                 |   7 +-
 arch/arm/mach-exynos/mcpm-exynos.c       |   7 +-
 arch/arm/probes/kprobes/actions-common.c |   6 +-
 arch/arm/probes/kprobes/actions-thumb.c  |  38 ++++--
 drivers/firmware/arm_scmi/Makefile       |   7 ++
 14 files changed, 193 insertions(+), 107 deletions(-)

-- 
2.30.2

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