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Message-ID: <87iljcjvny.ffs@tglx>
Date: Fri, 18 Nov 2022 13:26:25 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: "Tian, Kevin" <kevin.tian@...el.com>,
LKML <linux-kernel@...r.kernel.org>
Cc: "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Marc Zyngier <maz@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jason Gunthorpe <jgg@...lanox.com>,
"Jiang, Dave" <dave.jiang@...el.com>,
Alex Williamson <alex.williamson@...hat.com>,
"Williams, Dan J" <dan.j.williams@...el.com>,
Logan Gunthorpe <logang@...tatee.com>,
"Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
Allen Hubbe <allenbh@...il.com>,
"Ahmed S. Darwish" <darwi@...utronix.de>,
"Chatre, Reinette" <reinette.chatre@...el.com>
Subject: RE: [patch 15/20] genirq/msi: Provide new domain id allocation
functions
On Fri, Nov 18 2022 at 08:43, Kevin Tian wrote:
>> From: Thomas Gleixner <tglx@...utronix.de>
>> Sent: Friday, November 11, 2022 9:57 PM
>>
>> @@ -597,7 +598,7 @@ static struct irq_domain *msi_get_device
>> if (!domain)
>> return NULL;
>>
>> - if (WARN_ON_ONCE(irq_domain_is_msi_parent(domain)))
>> + if (irq_domain_is_msi_parent(domain))
>> return NULL;
>
> Is it intended to remove the warning here? If yes, what specific change
> in this patch leads to that removal?
Valid question
>> + xa_for_each_range(xa, idx, desc, ctrl->first + base, ctrl->last + base) {
>> + if (!msi_desc_match(desc, MSI_DESC_NOTASSOCIATED))
>> + continue;
>> +
>> + /* This should return -ECONFUSED... */
>> + if (WARN_ON_ONCE(allocated >= ctrl->nirqs))
>> + return -EINVAL;
>> +
>
> why is "==" an error?
because if you get here _after_ having allocated all interrupts already
then you have more descriptors than what you want to allocate, which
should never happen right?
Thanks,
tglx
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