linux-kernel - [PATCH v8 0/8] ftrace with regs + live patching for ppc64 LE (ABI v2)

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Message-Id: <20160210174221.EBBEC692C8@newverein.lst.de>
Date:	Wed, 10 Feb 2016 18:29:57 +0100
From:	Torsten Duwe <duwe@....de>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Jiri Kosina <jkosina@...e.cz>, Miroslav Benes <mbenes@...e.cz>,
	Petr Mladek <pmladek@...e.com>, Jessica Yu <jeyu@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	live-patching@...r.kernel.org
Subject: [PATCH v8 0/8] ftrace with regs + live patching for ppc64 LE (ABI v2)

Changes since V7:
  * drop "notrace" attribute for MMU-aiding functions
    and their callees.
  * merge "-mprofile-kernel"-stripping patches into one.

Changes since v6:
  * include Petr's patch, on popular demand ;)
  * move #ifdefs out of functions for readability;
    introduce static helper functions instead.
  * No more literal binary instructions in hex,
    at least not added by this patch set.
  * add compile time checker to detect the presence
    of known-good -mprofile-kernel support.
  * limit Kconfig / compile to the configurations really supported:
    + (static) FTRACE with -pg
    +  DYNAMIC_FTRACE with -pg with or without -mprofile-kernel
       (depending on the compiler)
    +  DYNAMIC_FTRACE_WITH_REGS only with -mprofile-kernel
       (will error out if the compiler is broken)

Changes since v5:
  * extra "std r0,LRSAVE(r1)" for gcc-6
    This makes the code compiler-agnostic.
  * Follow Petr Mladek's suggestion to avoid
    redefinition of HAVE_LIVEPATCH

Changes since v4:
  * change comment style in entry_64.S to C89
    (nobody is using assembler syntax comments there).
  * the bool function restore_r2 shouldn't return 2,
    that's a little confusing.
  * Test whether the compiler supports -mprofile-kernel
    and only then define CC_USING_MPROFILE_KERNEL
  * also make the return value of klp_check_compiler_support
    depend on that.

Major changes since v3:
  * the graph tracer works now.
    It turned out the stack frame it tried to manipulate does not
    exist at that point.
  * changes only needed in order to support -mprofile-kernel are now
    in a separate patch, prepended.
  * Kconfig cleanup so this is only selectable on ppc64le.

Petr Mladek (1):
  livepatch: Detect offset for the ftrace location during build

Torsten Duwe (7):
  ppc64 (le): prepare for -mprofile-kernel
  ppc64le FTRACE_WITH_REGS implementation
  ppc use ftrace_modify_all_code default
  ppc64 ftrace_with_regs configuration variables
  ppc64 ftrace_with_regs: disable profiling for some files
  Implement kernel live patching for ppc64le (ABIv2)
  Enable LIVEPATCH to be configured on ppc64le and add livepatch.o if it
    is selected

 arch/powerpc/Kconfig                        |   6 +
 arch/powerpc/Makefile                       |  17 +++
 arch/powerpc/gcc-mprofile-kernel-notrace.sh |  33 ++++++
 arch/powerpc/include/asm/code-patching.h    |  24 ++++
 arch/powerpc/include/asm/ftrace.h           |   5 +
 arch/powerpc/include/asm/livepatch.h        |  45 ++++++++
 arch/powerpc/kernel/Makefile                |  13 ++-
 arch/powerpc/kernel/entry_64.S              | 169 +++++++++++++++++++++++++++-
 arch/powerpc/kernel/ftrace.c                | 129 ++++++++++++++++-----
 arch/powerpc/kernel/livepatch.c             |  38 +++++++
 arch/powerpc/kernel/module_64.c             |  56 ++++++++-
 arch/powerpc/lib/Makefile                   |   4 +-
 arch/s390/Kconfig                           |   1 +
 kernel/livepatch/Makefile                   |  13 +++
 kernel/livepatch/core.c                     |  12 +-
 kernel/livepatch/ftrace-test.c              |   6 +
 kernel/trace/Kconfig                        |   5 +
 scripts/recordmcount.c                      |   6 +-
 scripts/recordmcount.h                      |  17 ++-
 19 files changed, 552 insertions(+), 47 deletions(-)
 create mode 100755 arch/powerpc/gcc-mprofile-kernel-notrace.sh
 create mode 100644 arch/powerpc/include/asm/livepatch.h
 create mode 100644 arch/powerpc/kernel/livepatch.c
 create mode 100644 kernel/livepatch/ftrace-test.c

-- 
1.8.5.6