linux-kernel - [PATCH v8 0/5] arm64: ftrace with regs

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Message-Id: <20190208150826.44EBC68DD2@newverein.lst.de>
Date:   Fri,  8 Feb 2019 16:08:26 +0100 (CET)
From:   duwe@....de (Torsten Duwe)
To:     Mark Rutland <mark.rutland@....com>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Julien Thierry <julien.thierry@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Amit Daniel Kachhap <amit.kachhap@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org
Subject: [PATCH v8 0/5] arm64: ftrace with regs

Patch series v8, as discussed.
The whole series applies cleanly on 5.0-rc5

---
 arch/arm64/Kconfig                    |    4 +
 arch/arm64/Makefile                   |   10 ++
 arch/arm64/include/asm/ftrace.h       |   16 ++++
 arch/arm64/include/asm/module.h       |    3 
 arch/arm64/kernel/Makefile            |   12 +--
 arch/arm64/kernel/entry-ftrace.S      |  125 ++++++++++++++++++++++++++++++++--
 arch/arm64/kernel/ftrace.c            |  117 ++++++++++++++++++++++++-------
 arch/arm64/kernel/module-plts.c       |    3 
 arch/arm64/kernel/module.c            |    2 
 arch/arm64/lib/Makefile               |    4 -
 drivers/firmware/efi/libstub/Makefile |   12 +--
 include/asm-generic/vmlinux.lds.h     |    2 
 include/linux/compiler_types.h        |    4 +
 kernel/module.c                       |   14 +++
 mm/kasan/Makefile                     |    8 +-
 15 files changed, 281 insertions(+), 55 deletions(-)
---
changes since v7:

* -pg -> $(CC_FLAGS_FTRACE) cleanup now split according to subtree
  maintainership.

* REC_IP_BRANCH_OFFSET is gone, the functionality went into
  ftrace_call_adjust(), where it belongs.

* MOV_X9_X30 macro is gone (why did we argue about its name anyway?);
  it is only used once now in the initial ftrace_make_nop new helper
  function ftrace_setup_lr_saver(), suggested by Julien.

* call site processing was missing for modules. Fixed.

changes since v6:

* change the stack layout once more; I hope I have it the "standard" way now.
  And yes, it looks simpler and cleaner; thanks, Mark, for nagging.

* split out the independent Kconfig and Makefile changes

* fixed style issues

* s/fp/x29/g

* MCOUNT_ADDR is now merely a 64-bit magic, as this is totally sufficient.

* QUICK_LR_SAVE renamed back to MOV_X9_X30.

* place MOV_X9_X30 insns on bootup, and only flip b <-> nop at runtime

* graph tracer "ifdeffery" reshuffle

	Torsten