linux-kernel - Re: [PATCH 15/42] PCI: aardvark: Change name of INTx irq

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Date:   Fri, 07 May 2021 10:08:18 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Remi Pommarel <repk@...plefau.lt>, Xogium <contact@...ium.me>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/42] PCI: aardvark: Change name of INTx irq_chip to advk-INT

On Thu, 06 May 2021 16:31:26 +0100,
Pali Rohár <pali@...nel.org> wrote:
> 
> This name is visible in /proc/interrupts file and for better reading it
> should have at most 8 characters. Also there is no need to allocate this
> name dynamically, since there is only one PCIe controller on Armada 37xx.
> This aligns with how the MSI irq_chip in this driver names it's interrupt
> ("advk-MSI").

And *because* the name is visible in /proc/interrupts, it has become
an ABI, and cannot be changed anymore.

We had the exact same issue with Tegra this merge window as I
accidentally changed "Tegra" to "tegra", resulting in userspace
programs failing find stuff in /proc/interrupts.

Please keep the name as is, no matter how ugly it is.

Thanks,

	M.

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