linux-kernel - [PATCH v3 0/4] preempt: PREEMPT vs PREEMPT

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Date:   Fri, 12 Nov 2021 18:51:59 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-kbuild@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Mike Galbraith <efault@....de>, Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v3 0/4] preempt: PREEMPT vs PREEMPT_DYNAMIC configs fixup

Hi folks,

This v3 is mostly about the naming problem - get your paintbrushes ready!

Patches
=======

o Patch 1 is the meat of the topic - note that it's now in tip/sched/urgent
o Patch 2 introduces helpers for the dynamic preempt state
o Patches 3-4 make use of said accessors where relevant.

Testing
=======

Briefly tested the dynamic part on an x86 kernel + QEMU.
Compile-tested the kcsan test thingie as a module.

Revisions
=========

v1: http://lore.kernel.org/r/20211105104035.3112162-1-valentin.schneider@arm.com
v1.5: http://lore.kernel.org/r/20211109151057.3489223-1-valentin.schneider@arm.com

v2 -> v3
++++++++

o Turned is_preempt_*() into preempt_model_*() (Frederic)
  It breaks my rule of "booleans must answer a yes/no question" but is the best
  I could come with using a "preempt_" prefix
  
o Added preempt_model_preemptible() (Marco)
  Now used in kcsan_test.c
  
o Dropped powerpc changes

Cheers,
Valentin


Valentin Schneider (4):
  preempt: Restore preemption model selection configs
  preempt/dynamic: Introduce preemption model accessors
  kcsan: Use preemption model accessors
  ftrace: Use preemption model accessors for trace header printout

 include/linux/kernel.h    |  2 +-
 include/linux/sched.h     | 41 ++++++++++++++++++++++++++++++++++++++
 include/linux/vermagic.h  |  2 +-
 init/Makefile             |  2 +-
 kernel/Kconfig.preempt    | 42 +++++++++++++++++++--------------------
 kernel/kcsan/kcsan_test.c |  5 +++--
 kernel/sched/core.c       | 18 ++++++++++++++---
 kernel/trace/trace.c      | 14 ++++---------
 8 files changed, 87 insertions(+), 39 deletions(-)

--
2.25.1