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Message-ID: <87k0q3zco1.fsf@vitty.brq.redhat.com>
Date: Fri, 19 Mar 2021 10:59:58 +0100
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] genirq/matrix: WARN_ON_ONCE() when
cm->allocated/m->total_allocated go negative
Thomas Gleixner <tglx@...utronix.de> writes:
> On Thu, Mar 18 2021 at 08:58, Vitaly Kuznetsov wrote:
>> Thomas Gleixner <tglx@...utronix.de> writes:
>>> There is a way more useful way to handle this. In such a case the bit is
>>> NOT set in the alloc map. So:
>>>
>>> if (!WARN_ON_ONCE(test_and_clear_bit(bit, cm->alloc_map)))
>>> return;
>>>
>>> would have caught the problem at hand nicely and let the machine survive
>>> while just throwing warns and continuing is broken to begin with.
>>
>> Thanks, I like the idea. I didn't do that probably because the problem
>> which triggered me to write these patches wasn't fatal, it was just
>> causing CPU0 offlining to fail.
>
> Can you whip up a patch for that?
>
Sure, will do!
--
Vitaly
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