linux-kernel - [PATCH v2 0/8] Replace PREEMPT_RT ifdefs with preempt_[dis|en]able

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Date:   Thu, 25 Aug 2022 18:41:23 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH v2 0/8] Replace PREEMPT_RT ifdefs with preempt_[dis|en]able_nested().

Folks,

this is v2 of "Replace PREEMPT_RT ifdefs with preempt_[dis|en]able_nested()."
The v1 is at
   https://lore.kernel.org/all/20220817162703.728679-1-bigeasy@linutronix.de/

v1…v2:
   - The SLUB patch got s/use_lockless_fast_path/USE_LOCKLESS_FAST_PATH/ as
     Linus asked for and was handed over to Vlastimil and is sitting in his
     slab tree:
        https://git.kernel.org/vbabka/slab/c/591570a7

   - The compaction patch got an "depends on COMPACTION" so it is not listed
     .config if compaction is disabled (Rasmus Villemoes).

   - The removal of u64_stats_fetch_begin_irq() has been excluded from the
     series and staged for later. Jakub asked for this, so that it can be
     included in later merge window.

   - A patch for flex_proportions has been added which also needs a
     preempt_disable_nested() since the merge window.

Original cover letter:

this is the follow up to the "vfs.git pile 3 - dcache" pull request [0].
It was concluded that the introduction of
	preempt_disable_nested()

in general makes sense and should be used in places where preemption on
!RT is disabled by other means and PREEMPT_RT need to explicitly disable
it.

This series introduces the macro and converts already existing users to
that macro. The u64_stat interface was simplified to make the change
simpler and code easier to follow.

[0] https://lore.kernel.org/all/YurA3aSb4GRr4wlW@ZenIV/

Sebastian