linux-kernel - [PATCH 0/6 v3] cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states

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Message-ID: <20250102150201.21639-1-frederic@kernel.org>
Date: Thu,  2 Jan 2025 16:01:54 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 0/6 v3] cpuidle: Handle TIF_NR_POLLING on behalf of polling idle states

The TIF_NR_POLLING handling against TIF_NEED_RESCHED polling/monitoring
idle states (mwait and also software polling) is a bit messy, with quite
some wasted cycles spent on useless atomic operations. This tries to
consolidate this state handling from the cpuidle core.

Changes since v2:

_ Handle buggy mwait implementations (thanks Rafael)

Frederic Weisbecker (4):
  cpuidle: Remove unnecessary current_clr_polling_and_test() from
    haltpoll
  x86/cpuidle: Move buggy mwait implementations away from
    CPUIDLE_FLAG_MWAIT
  cpuidle: Remove call_cpuidle_s2idle()
  cpuidle: Handle TIF_NR_POLLING on behalf of software polling idle
    states

Peter Zijlstra (2):
  cpuidle: Introduce CPUIDLE_FLAG_MWAIT
  cpuidle: Handle TIF_NR_POLLING on behalf of CPUIDLE_FLAG_MWAIT states

 arch/arm/include/asm/cpuidle.h     |  2 ++
 arch/arm64/include/asm/cpuidle.h   |  3 ++
 arch/powerpc/include/asm/cpuidle.h |  4 +++
 arch/riscv/include/asm/cpuidle.h   |  2 ++
 arch/x86/include/asm/cpuidle.h     | 12 +++++++
 arch/x86/include/asm/mwait.h       | 27 +++++++--------
 drivers/acpi/processor_idle.c      |  5 +++
 drivers/cpuidle/cpuidle-haltpoll.c |  3 --
 drivers/cpuidle/cpuidle-powernv.c  | 10 ------
 drivers/cpuidle/cpuidle-pseries.c  | 11 -------
 drivers/cpuidle/cpuidle.c          | 22 ++++++++++++-
 drivers/cpuidle/poll_state.c       | 30 +++++++----------
 drivers/idle/intel_idle.c          |  8 +++++
 include/asm-generic/Kbuild         |  1 +
 include/asm-generic/cpuidle.h      | 10 ++++++
 include/linux/cpuidle.h            |  1 +
 include/linux/sched/idle.h         |  7 +++-
 kernel/sched/idle.c                | 53 +++++++++---------------------
 18 files changed, 114 insertions(+), 97 deletions(-)
 create mode 100644 arch/x86/include/asm/cpuidle.h
 create mode 100644 include/asm-generic/cpuidle.h

-- 
2.46.0