linux-kernel - [RFC][PATCH 0/7] jump_label: Another (better) static

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Date:	Fri, 24 Jul 2015 19:52:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	linux-kernel@...r.kernel.org, mingo@...nel.org
Cc:	jasonbaron0@...il.com, bp@...en8.de, luto@...capital.net,
	tglx@...utronix.de, rostedt@...dmis.org, will.deacon@....com,
	liuj97@...il.com, rabin@....in, ralf@...ux-mips.org,
	ddaney@...iumnetworks.com, benh@...nel.crashing.org,
	michael@...erman.id.au, heiko.carstens@...ibm.com,
	davem@...emloft.net, peterz@...radead.org
Subject: [RFC][PATCH 0/7] jump_label: Another (better) static_key interface

Hi all,

After yet another bug because of the weirdness of the static key interface,
here an attempt at providing a better one.

This is boot tested on x86_64, bzImage works, modules have a problem. It looks
like jump_label_add_module() runs into a 'wrong' NOP, which would indicate
jump_label_apply_nops() didn't work right.

I'm too tired to spot the fail, so I figured I'd post it anyway :-)

Beware: x86_64_defconfig has CONFIG_JUMP_LABEL=n.

@arch people, please have a look at patch 6 where I've attempted to do
inline asm for all kinds of unknown archs.

---
 arch/arm/include/asm/jump_label.h     |  18 +++-
 arch/arm/kernel/jump_label.c          |   2 +-
 arch/arm64/include/asm/jump_label.h   |  18 +++-
 arch/arm64/kernel/jump_label.c        |   2 +-
 arch/mips/include/asm/jump_label.h    |  19 +++-
 arch/mips/kernel/jump_label.c         |   2 +-
 arch/powerpc/include/asm/jump_label.h |  19 +++-
 arch/powerpc/kernel/jump_label.c      |   2 +-
 arch/s390/include/asm/jump_label.h    |  19 +++-
 arch/s390/kernel/jump_label.c         |   2 +-
 arch/sparc/include/asm/jump_label.h   |  34 ++++--
 arch/sparc/kernel/jump_label.c        |   2 +-
 arch/x86/include/asm/jump_label.h     |  21 +++-
 arch/x86/kernel/jump_label.c          |   2 +-
 arch/x86/kernel/tsc.c                 |  22 ++--
 include/linux/jump_label.h            | 188 +++++++++++++++++++++++++++++-----
 kernel/jump_label.c                   | 114 ++++++++++++---------
 kernel/sched/core.c                   |   6 +-
 18 files changed, 374 insertions(+), 118 deletions(-)

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