linux-kernel - [PATCH v2 0/3] smp: Allow smp_call_function_single

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Message-Id: <20191216213125.9536-1-peterx@redhat.com>
Date:   Mon, 16 Dec 2019 16:31:22 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>, peterx@...hat.com,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 0/3] smp: Allow smp_call_function_single_async() to insert locked csd

This v2 introduced two more patches to let mips/kernel/smp.c and
kernel/sched/core.c to start using the new feature, then we can drop
the customized implementations.

One thing to mention is that cpuidle_coupled_poke_pending is another
candidate that we can consider, however that cpumask is special in
that it's not only used for singleton test of the per-vcpu csd when
injecting new calls, but also in cpuidle_coupled_any_pokes_pending()
or so to check whether there's any pending pokes.  In that sense it
should be good to still keep the mask because it could be faster than
looping over each per-cpu csd.

Patch 1 is the same as v1, no change.  Patch 2-3 are new ones.

Smoke tested on x86_64 only.

Please review, thanks.

Peter Xu (3):
  smp: Allow smp_call_function_single_async() to insert locked csd
  MIPS: smp: Remove tick_broadcast_count
  sched: Remove rq.hrtick_csd_pending

 arch/mips/kernel/smp.c |  8 +-------
 kernel/sched/core.c    |  9 ++-------
 kernel/sched/sched.h   |  1 -
 kernel/smp.c           | 14 +++++++++++---
 4 files changed, 14 insertions(+), 18 deletions(-)

-- 
2.23.0