linux-kernel - Re: [Bug 202453] TRACE irq/18-i801_smb Tainted when enabled threadirqs in kernel commandline.

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Message-ID: <87tut084f1.fsf@nanos.tec.linutronix.de>
Date:   Sat, 05 Dec 2020 19:59:46 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     bugzilla-daemon@...zilla.kernel.org, jdelvare@...e.de,
        wsa@...nel.org, benjamin.tissoires@...hat.com, rui.zhang@...el.com,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Carlos Jimenez <javashin1986@...il.com>
Subject: Re: [Bug 202453] TRACE irq/18-i801_smb Tainted when enabled threadirqs in kernel commandline.

On Sat, Dec 05 2020 at 17:24, Oleksandr Natalenko wrote:
> On Sat, Dec 05, 2020 at 05:19:18PM +0100, Thomas Gleixner wrote:
>> +/**
>> + * generic_dispatch_irq - Dispatch an interrupt from an interrupt handler
>> + * @irq:	The irq number to handle
>> + *
>> + * A wrapper around generic_handle_irq() which ensures that interrupts are
>> + * disabled when the primary handler of the dispatched irq is invoked.
>> + * This is useful for interrupt handlers with dispatching to be safe for
>> + * the forced threaded case.
>> + */
>> +int generic_dispatch_irq(unsigned int irq)
>> +{
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	local_irq_save(&flags);
>> +	ret = generic_handle_irq(irq);
>> +	local_irq_restore(&flags);
>
> FWIW, for me &flags explodes build on v5.10-rc6. I had to change it to local_irq_save/restore(flags) (without taking an address via &).

That's right. Don't know what I was thinking when writing it and then
compiling with the patch removed (just checked history ...) Oh, well