From: Will Deacon <will@kernel.org>
To: Marc Zyngier <maz@kernel.org>
Cc: LAK <linux-arm-kernel@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Valentin Schneider <Valentin.Schneider@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
Russell King <linux@arm.linux.org.uk>,
Android Kernel Team <kernel-team@android.com>
Subject: Re: [PATCH v2 3/6] arm64: Mark the recheduling IPI as raw interrupt
Date: Thu, 10 Dec 2020 15:15:55 +0000 [thread overview]
Message-ID: <20201210151555.GB10381@willie-the-truck> (raw)
In-Reply-To: <20201124141449.572446-4-maz@kernel.org>
On Tue, Nov 24, 2020 at 02:14:46PM +0000, Marc Zyngier wrote:
> Flag the rescheduling IPI as 'raw', making sure such interrupt
> skips both tick management and irqtime accounting.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
> arch/arm64/Kconfig | 1 +
> arch/arm64/kernel/smp.c | 4 ++++
> 2 files changed, 5 insertions(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 1515f6f153a0..d18c2c15848d 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -108,6 +108,7 @@ config ARM64
> select GENERIC_EARLY_IOREMAP
> select GENERIC_IDLE_POLL_SETUP
> select GENERIC_IRQ_IPI
> + select ARCH_WANTS_IRQ_RAW
> select GENERIC_IRQ_MULTI_HANDLER
> select GENERIC_IRQ_PROBE
> select GENERIC_IRQ_SHOW
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 18e9727d3f64..bad51f7f7ffe 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -995,6 +995,10 @@ void __init set_smp_ipi_range(int ipi_base, int n)
>
> ipi_desc[i] = irq_to_desc(ipi_base + i);
> irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
> +
> + /* The recheduling IPI is special... */
> + if (i == IPI_RESCHEDULE)
> + __irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0);
Acked-by: Will Deacon <will@kernel.org>
Although this part isn't the controversial bit :)
Will
next prev parent reply other threads:[~2020-12-10 15:17 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 14:14 [PATCH v2 0/6] arm/arm64: Allow the rescheduling IPI to bypass irq_enter/exit Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 1/6] genirq: Add __irq_modify_status() helper to clear/set special flags Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 2/6] genirq: Allow an interrupt to be marked as 'raw' Marc Zyngier
2020-11-24 16:26 ` Peter Zijlstra
2020-11-24 16:56 ` Marc Zyngier
2020-11-26 18:18 ` Valentin Schneider
2020-12-03 13:03 ` Peter Zijlstra
2020-12-03 15:52 ` Valentin Schneider
2020-12-05 19:24 ` Valentin Schneider
2020-12-10 15:07 ` Will Deacon
2021-06-23 17:28 ` Todd Kjos
2020-11-24 14:14 ` [PATCH v2 3/6] arm64: Mark the recheduling IPI as raw interrupt Marc Zyngier
2020-12-10 15:15 ` Will Deacon [this message]
2020-11-24 14:14 ` [PATCH v2 4/6] arm: " Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 5/6] genirq: Drop IRQ_HIDDEN from IRQF_MODIFY_MASK Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 6/6] genirq: Rename IRQ_HIDDEN to IRQ_IPI Marc Zyngier
2020-11-26 18:18 ` Valentin Schneider
2021-03-01 0:39 ` [PATCH v2 0/6] arm/arm64: Allow the rescheduling IPI to bypass irq_enter/exit ito-yuichi
2021-03-01 9:22 ` Marc Zyngier
2021-03-09 6:20 ` Yuichi Ito
2021-06-18 19:30 ` Abhijeet Dharmapurikar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201210151555.GB10381@willie-the-truck \
--to=will@kernel.org \
--cc=Valentin.Schneider@arm.com \
--cc=catalin.marinas@arm.com \
--cc=kernel-team@android.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=mark.rutland@arm.com \
--cc=maz@kernel.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).