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From: Thomas Gleixner <tglx@linutronix.de>
To: "Marek Behún" <kabel@kernel.org>, "Andrew Lunn" <andrew@lunn.ch>,
	"Gregory Clement" <gregory.clement@bootlin.com>,
	"Sebastian Hesselbarth" <sebastian.hesselbarth@gmail.com>,
	linux-arm-kernel@lists.infradead.org, arm@kernel.org,
	"Andy Shevchenko" <andy@kernel.org>,
	"Hans de Goede" <hdegoede@redhat.com>,
	"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Cc: "Marek Behún" <kabel@kernel.org>
Subject: Re: [PATCH 11/13] irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register
Date: Sun, 28 Jul 2024 23:53:53 +0200	[thread overview]
Message-ID: <87plqxrxn2.ffs@tglx> (raw)
In-Reply-To: <20240715105156.18388-12-kabel@kernel.org>

On Mon, Jul 15 2024 at 12:51, Marek Behún wrote:
> Use MPIC_PER_CPU_IRQS_NR (29) bound instead of BITS_PER_LONG (32) when
> iterating the bits of the per-CPU interrupt cause register, since there
> are only 29 per-CPU interrupts. The top 3 bits are always zero anyway,
> so this may save a couple of cycles in the interrupt handler.

I seriously doubt that it saves a single cycle, but adjusting the limit
is correct by itself.

Thanks,

        tglx


  reply	other threads:[~2024-07-28 21:54 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-07-15 10:51 [PATCH 00/13] armada-370-xp irqchip updates round 5 Marek Behún
2024-07-15 10:51 ` [PATCH 01/13] irqchip/armada-370-xp: Drop IPI_DOORBELL_START and rename IPI_DOORBELL_END Marek Behún
2024-07-15 10:51 ` [PATCH 02/13] irqchip/armada-370-xp: Drop msi_doorbell_end() Marek Behún
2024-07-15 10:51 ` [PATCH 03/13] irqchip/armada-370-xp: Rename struct irq_domain variables for consistency Marek Behún
2024-07-28 21:41   ` Thomas Gleixner
2024-07-15 10:51 ` [PATCH 04/13] irqchip/armada-370-xp: Add the __init attribute to mpic_msi_init() Marek Behún
2024-07-28 21:42   ` Thomas Gleixner
2024-07-15 10:51 ` [PATCH 05/13] irqchip/armada-370-xp: Put __init attribute after return type in mpic_ipi_init() Marek Behún
2024-07-15 10:51 ` [PATCH 06/13] irqchip/armada-370-xp: Put static variables into driver private structure Marek Behún
2024-07-28 21:44   ` Thomas Gleixner
2024-07-15 10:51 ` [PATCH 07/13] irqchip/armada-370-xp: Put MSI doorbell limits into the mpic structure Marek Behún
2024-07-15 10:51 ` [PATCH 08/13] irqchip/armada-370-xp: Pass around the driver private structure Marek Behún
2024-07-15 10:51 ` [PATCH 09/13] irqchip/armada-370-xp: Dynamically allocate " Marek Behún
2024-07-15 10:51 ` [PATCH 10/13] irqchip/armada-370-xp: Fix reenabling last per-CPU interrupt Marek Behún
2024-07-28 21:47   ` Thomas Gleixner
2024-07-29 13:28     ` Marek Behún
2024-07-29 13:36       ` Thomas Gleixner
2024-07-15 10:51 ` [PATCH 11/13] irqchip/armada-370-xp: Iterate only valid bits of the per-CPU interrupt cause register Marek Behún
2024-07-28 21:53   ` Thomas Gleixner [this message]
2024-07-15 10:51 ` [PATCH 12/13] irqchip/armada-370-xp: Allow mapping only per-CPU interrupts Marek Behún
2024-07-28 21:55   ` Thomas Gleixner
2024-07-15 10:51 ` [PATCH 13/13] irqchip/armada-370-xp: Use the mpic_is_ipi_available() helper in one more case Marek Behún

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