linux-kernel - [PATCH 0/5] [GIT PULL] x86/jump label: Paranoid checks and 2 or 5 byte nops

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Message-Id: <20120127201442.080360013@goodmis.org>
Date:	Fri, 27 Jan 2012 15:14:42 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Baron <jbaron@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 0/5] [GIT PULL] x86/jump label: Paranoid checks and 2 or 5 byte nops

Ingo,

I've done some final clean ups of the 2 or 5 byte nop code and I also added
a few generic clean ups of jump label itself. The first 2 patches use the
best nops as defined by Peter when we do not know what the machine is running.

The third patch adds paranoid checks, to make sure what we are modifying
is truely what it expects. Otherwise we bug and crash the kernel
(as recommended by Peter).

The last two patches are the clean up versions of the 2 or 5 byte nops.

Note, there is code in the infrastructure that can be shared among
other users in scripts and elsewhere. I rather get this code in first
and then fiddle with seeing who does what and then integrate all the
code together. As that may not be such an easy task, and I don't want
to post pone this code due to it.

Also, I feel that we can let this code sit for a bit on LKML and let
people comment. If everyone gives there acks, then we can pull this code
in. I already tested it, but if there are acks, I can rebase just to
update the acked-bys.

Please pull (if everyone's OK with it) the latest tip/perf/jump-label tree,
 which can be found at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
tip/perf/jump-label

Head SHA1: 7837dddecaa7e7f31b732a0c302a4bdd255a8321

Steven Rostedt (5):
      x86/jump-label: Use best default nops for inital jump label calls
      x86/jump-label: Do not bother updating nops if they are correct
      x86/jump-label: Add safety checks to jump label conversions
      jump labels: Add infrastructure to update jump labels at compile time
      jump labels/x86: Use etiher 5 byte or 2 byte jumps

----
 Makefile                          |    7 +
 arch/Kconfig                      |    6 +
 arch/x86/Kconfig                  |    1 +
 arch/x86/include/asm/jump_label.h |    9 +-
 arch/x86/kernel/jump_label.c      |  110 +++++++++++-
 scripts/Makefile                  |    1 +
 scripts/Makefile.build            |   15 ++-
 scripts/update_jump_label.c       |  335 +++++++++++++++++++++++++++++++++++++
 scripts/update_jump_label.h       |  208 +++++++++++++++++++++++
 9 files changed, 678 insertions(+), 14 deletions(-)

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