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From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, ardb@kernel.org,
	bp@alien8.de, dave.hansen@linux.intel.com, frederic@kernel.org,
	james.morse@arm.com, joey.gouly@arm.com, juri.lelli@redhat.com,
	linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com,
	peterz@infradead.org, tglx@linutronix.de,
	valentin.schneider@arm.com, will@kernel.org
Subject: Re: [PATCH v2 6/7] arm64: entry: centralize premeption decision
Date: Fri, 4 Feb 2022 18:46:34 +0000	[thread overview]
Message-ID: <Yf10inOXewNOg15c@arm.com> (raw)
In-Reply-To: <20220204150557.434610-7-mark.rutland@arm.com>

On Fri, Feb 04, 2022 at 03:05:56PM +0000, Mark Rutland wrote:
> For historical reasons, the decision of whether or not to preempt is
> spread across arm64_preempt_schedule_irq() and __el1_irq(), and it would
> be clearer if this were all in one place.
> 
> Also, arm64_preempt_schedule_irq() calls lockdep_assert_irqs_disabled(),
> but this is redundant, as we have a subsequent identical assertion in
> __exit_to_kernel_mode(), and preempt_schedule_irq() will
> BUG_ON(!irqs_disabled()) anyway.
> 
> This patch removes the redundant assertion and centralizes the
> preemption decision making within arm64_preempt_schedule_irq().
> 
> Other than the slight change to assertion behaviour, there should be no
> functional change as a result of this patch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: James Morse <james.morse@arm.com>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Will Deacon <will@kernel.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, ardb@kernel.org,
	bp@alien8.de, dave.hansen@linux.intel.com, frederic@kernel.org,
	james.morse@arm.com, joey.gouly@arm.com, juri.lelli@redhat.com,
	linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com,
	peterz@infradead.org, tglx@linutronix.de,
	valentin.schneider@arm.com, will@kernel.org
Subject: Re: [PATCH v2 6/7] arm64: entry: centralize premeption decision
Date: Fri, 4 Feb 2022 18:46:34 +0000	[thread overview]
Message-ID: <Yf10inOXewNOg15c@arm.com> (raw)
In-Reply-To: <20220204150557.434610-7-mark.rutland@arm.com>

On Fri, Feb 04, 2022 at 03:05:56PM +0000, Mark Rutland wrote:
> For historical reasons, the decision of whether or not to preempt is
> spread across arm64_preempt_schedule_irq() and __el1_irq(), and it would
> be clearer if this were all in one place.
> 
> Also, arm64_preempt_schedule_irq() calls lockdep_assert_irqs_disabled(),
> but this is redundant, as we have a subsequent identical assertion in
> __exit_to_kernel_mode(), and preempt_schedule_irq() will
> BUG_ON(!irqs_disabled()) anyway.
> 
> This patch removes the redundant assertion and centralizes the
> preemption decision making within arm64_preempt_schedule_irq().
> 
> Other than the slight change to assertion behaviour, there should be no
> functional change as a result of this patch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: James Morse <james.morse@arm.com>
> Cc: Joey Gouly <joey.gouly@arm.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Will Deacon <will@kernel.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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  reply	other threads:[~2022-02-04 18:46 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-04 15:05 [PATCH v2 0/7] arm64 / sched/preempt: support PREEMPT_DYNAMIC with static keys Mark Rutland
2022-02-04 15:05 ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 1/7] sched/preempt: move PREEMPT_DYNAMIC logic later Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 2/7] sched/preempt: refactor sched_dynamic_update() Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 3/7] sched/preempt: simplify irqentry_exit_cond_resched() callers Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 4/7] sched/preempt: decouple HAVE_PREEMPT_DYNAMIC from GENERIC_ENTRY Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 5/7] sched/preempt: add PREEMPT_DYNAMIC using static keys Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-07 11:57   ` Frederic Weisbecker
2022-02-07 11:57     ` Frederic Weisbecker
2022-02-08 12:15     ` Mark Rutland
2022-02-08 12:15       ` Mark Rutland
2022-02-04 15:05 ` [PATCH v2 6/7] arm64: entry: centralize premeption decision Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 18:46   ` Catalin Marinas [this message]
2022-02-04 18:46     ` Catalin Marinas
2022-02-04 15:05 ` [PATCH v2 7/7] arm64: support PREEMPT_DYNAMIC Mark Rutland
2022-02-04 15:05   ` Mark Rutland
2022-02-04 18:48   ` Catalin Marinas
2022-02-04 18:48     ` Catalin Marinas
2022-02-04 20:41   ` kernel test robot

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