linux-kernel - Re: [PATCH v2 5/5] irqchip/gic-v3-its: Use allocation size from the prepare call

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Message-ID: <86wmacewjr.wl-maz@kernel.org>
Date: Mon, 19 May 2025 11:15:20 +0100
From: Marc Zyngier <maz@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Sascha Bischoff
 <sascha.bischoff@....com>,
	Timothy Hayes <timothy.hayes@....com>
Subject: Re: [PATCH v2 5/5] irqchip/gic-v3-its: Use allocation size from the prepare call

On Sun, 18 May 2025 19:53:42 +0100,
Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> On Tue, May 13 2025 at 17:31, Marc Zyngier wrote:
> 
> > Now that .msi_prepare() gets called at the right time and not
> > with semi-random parameters, remove the ugly hack that tried
> > to fix up the number of allocated vectors.
> >
> > It is now correct by construction.
> 
> FWIW, while looking at something related, it occured to me that with
> this change you can enable MSI_FLAG_PCI_MSIX_ALLOC_DYN now on GIC ITS.

Maybe. It is rather unclear to me what this "dynamic allocation"
actually provides in terms of guarantees to the endpoint driver.

	M.

-- 
Without deviation from the norm, progress is not possible.