linux-kernel - Re: [PATCH 11/14] irq: add support for allocating (and affinitizing) sets of IRQs

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Message-ID: <20181030150840.GC18906@localhost.localdomain>
Date:   Tue, 30 Oct 2018 09:08:40 -0600
From:   Keith Busch <keith.busch@...el.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 11/14] irq: add support for allocating (and affinitizing)
 sets of IRQs

On Tue, Oct 30, 2018 at 08:53:37AM -0600, Jens Axboe wrote:
> The sum of the set can't exceed the nvecs passed in, the nvecs passed in
> should be the less than or equal to nvecs. Granted this isn't enforced,
> and perhaps that should be the case.

That should at least initially be true for a proper functioning
driver. It's not enforced as you mentioned, but that's only related to
the issue I'm referring to.

The problem is pci_alloc_irq_vectors_affinity() takes a range, min_vecs
and max_vecs, but a range of allowable vector allocations doesn't make
sense when using sets.