linux-kernel - [PATCH v3 0/8] ftrace with regs + live patching for ppc64 LE (ABI v2)

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Date:	Mon, 26 Oct 2015 18:49:30 +0100
From:	Torsten Duwe <duwe@....de>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Michael Ellerman <mpe@...erman.id.au>
Cc:	Jiri Kosina <jkosina@...e.cz>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org
Subject: [PATCH v3 0/8] ftrace with regs + live patching for ppc64 LE (ABI
	v2)

Hi all,

here is the current status of ftrace with regs, trace ops and live patching
for ppc64le. It seems I broke the ftrace graph caller and I spent most of
last week trying to fix it; Steven, maybe you could have a look? I startet
out with -mprofile-kernel and now found that the ordinary -pg is very
different. -mprofile-kernel only does the very bare minimal prologue
(set TOC, save LR) and then calls _mcount, which poses some problems.
I managed to get them resolved up to the point of the graph return ...

I tested intensively with the ftrace self tests, and, without the graph
caller, this set passes all of them on ppc64le. I tried not to break BE,
but may have missed an ifdef or two.

patch 2 (ftrace_modify_all_code default) is an independent prerequisite,
I would even call it a fix -- please consider applying it even if you
don't like the rest.

patch 5 has proven to be very useful during development; as mentioned earlier,
many of these functions may get called during a recoverable fault. The whole
recursion will probably terminate if all goes well, but I'd rather be
defensive here.

Torsten Duwe (8):
  ppc64le FTRACE_WITH_REGS implementation
  ppc use ftrace_modify_all_code default
  ppc64 ftrace_with_regs configuration variables
  ppc64 ftrace_with_regs: spare early boot and low level
  ppc64 ftrace: disable profiling for some functions
  ppc64 ftrace: 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                 |   7 ++
 arch/powerpc/Makefile                |   7 ++
 arch/powerpc/include/asm/ftrace.h    |   5 ++
 arch/powerpc/include/asm/livepatch.h |  27 +++++++
 arch/powerpc/kernel/Makefile         |  13 +--
 arch/powerpc/kernel/entry_64.S       | 153 ++++++++++++++++++++++++++++++++++-
 arch/powerpc/kernel/ftrace.c         |  88 +++++++++++++++-----
 arch/powerpc/kernel/livepatch.c      |  20 +++++
 arch/powerpc/kernel/module_64.c      |  39 ++++++++-
 arch/powerpc/kernel/process.c        |   2 +-
 arch/powerpc/lib/Makefile            |   4 +-
 arch/powerpc/mm/fault.c              |   2 +-
 arch/powerpc/mm/hash_utils_64.c      |  18 ++---
 arch/powerpc/mm/hugetlbpage-hash64.c |   2 +-
 arch/powerpc/mm/hugetlbpage.c        |   4 +-
 arch/powerpc/mm/mem.c                |   2 +-
 arch/powerpc/mm/pgtable_64.c         |   2 +-
 arch/powerpc/mm/slb.c                |   6 +-
 arch/powerpc/mm/slice.c              |   8 +-
 kernel/trace/Kconfig                 |   5 ++
 20 files changed, 359 insertions(+), 55 deletions(-)
 create mode 100644 arch/powerpc/include/asm/livepatch.h
 create mode 100644 arch/powerpc/kernel/livepatch.c

-- 
1.8.5.6

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