linux-kernel - [PATCH 0/9] jump label v6

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Date:	Fri, 9 Apr 2010 15:49:11 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, mathieu.desnoyers@...ymtl.ca, hpa@...or.com,
	tglx@...utronix.de, rostedt@...dmis.org, andi@...stfloor.org,
	roland@...hat.com, rth@...hat.com, mhiramat@...hat.com,
	fweisbec@...il.com, avi@...hat.com
Subject: [PATCH 0/9] jump label v6

Hi,

Refresh of jump labeling patches aginst -tip tree. For bacground see: 
http://marc.info/?l=linux-kernel&m=125858436505941&w=2

I believe I've addressed all the reviews from v5.

Changes in v6:

* I've moved Steve Rostedt's 'ftrace_dyn_arch_init()' to alternative.c to
put it into a common area for used by both ftrace and jump labels. By
default we put a 'jmp 5' in the nop slot. Then, when we detect the best
runtime no-op we patch over the 'jmp 5' with the appropriate nop.

* build time sort of the jump label table. The jump label table is more
optimally accessed if the entries are continguous. Sorting the table
accomplishes this. Do the sort at build-time. Adds a '-j' option to 
'modpost' which replaces the vmlinux, with a sorted jump label section vmlinux.
I've tested this on x86 with relocatable and it works fine there as well. Note
that I have not sorted the jump label table in modules. This is b/c the jump
label names can be exported by the core kernel, and thus I don't have them
available at buildtime. This could be solved by either finding the correct
ones in the vmlinux, or by embedding the name of the jump label in the module
tables (and not just a pointer), but the module tables tend to be smaller, and
thus there is less value to this kind of change anyway. The kernel continues to
do the sort, just in case, but at least for the vmlinux, this is just a
verfication b/c the jump label table has already been sorted.

* added jump_label_text_reserved(), so that other routines that want to patch
the code, can first verify that they are not stomping on jump label addresses.

thanks,

-Jason

Jason Baron (8):
  jump label: base patch
  jump label: x86 support
  jump label: tracepoint support
  jump label: add module support
  jump label: move ftrace_dyn_arch_init to common code
  jump label: sort jump table at build-time
  jump label: initialize workqueue tracepoints *before* they are
    registered
  jump label: jump_label_text_reserved() to reserve our jump points

Mathieu Desnoyers (1):
  jump label: notifier atomic call chain notrace

 Makefile                           |    4 +
 arch/x86/include/asm/alternative.h |   14 ++
 arch/x86/include/asm/jump_label.h  |   27 +++
 arch/x86/kernel/Makefile           |    2 +-
 arch/x86/kernel/alternative.c      |   71 ++++++-
 arch/x86/kernel/ftrace.c           |   70 +------
 arch/x86/kernel/jump_label.c       |   42 ++++
 arch/x86/kernel/kprobes.c          |    3 +-
 arch/x86/kernel/module.c           |    3 +
 arch/x86/kernel/ptrace.c           |    1 +
 arch/x86/kernel/setup.c            |    2 +
 include/asm-generic/vmlinux.lds.h  |   22 ++-
 include/linux/jump_label.h         |   76 +++++++
 include/linux/module.h             |    5 +-
 include/linux/tracepoint.h         |   34 ++--
 kernel/Makefile                    |    2 +-
 kernel/jump_label.c                |  428 ++++++++++++++++++++++++++++++++++++
 kernel/kprobes.c                   |    3 +-
 kernel/module.c                    |    7 +
 kernel/notifier.c                  |    6 +-
 kernel/trace/ftrace.c              |   13 +-
 kernel/trace/trace_workqueue.c     |   10 +-
 kernel/tracepoint.c                |    8 +
 scripts/mod/modpost.c              |   69 ++++++-
 scripts/mod/modpost.h              |    9 +
 25 files changed, 816 insertions(+), 115 deletions(-)
 create mode 100644 arch/x86/include/asm/jump_label.h
 create mode 100644 arch/x86/kernel/jump_label.c
 create mode 100644 include/linux/jump_label.h
 create mode 100644 kernel/jump_label.c

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