From: Christoph Hellwig <hch@lst.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Hans de Goede <hdegoede@redhat.com>,
intel-gfx@lists.freedesktop.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
x86@kernel.org, hch@lst.de
Subject: Re: 5.13 i915/PAT regression on Brasswell, adding nopat to the kernel commandline worksaround this
Date: Wed, 12 May 2021 13:57:36 +0200 [thread overview]
Message-ID: <20210512115736.GA10444@lst.de> (raw)
In-Reply-To: <YJu4tzXmCJbKp7Fm@hirez.programming.kicks-ass.net>
On Wed, May 12, 2021 at 01:15:03PM +0200, Peter Zijlstra wrote:
> IIRC it's because of 74ffa5a3e685 ("mm: add remap_pfn_range_notrack"),
> which added a sanity check to make sure expectations were met. It turns
> out they were not.
>
> The bug is not new, the warning is. AFAIK the i915 team is aware, but
> other than that I've not followed.
The actual culprit is b12d691ea5e0 ("i915: fix remap_io_sg to verify the
pgprot"), but otherwise agreed. Someone the i915 maintainers all seem
to be on vacation as the previous report did not manage to trigger any
kind of reply.
next prev parent reply other threads:[~2021-05-12 11:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 9:57 5.13 i915/PAT regression on Brasswell, adding nopat to the kernel commandline worksaround this Hans de Goede
2021-05-12 11:15 ` Peter Zijlstra
2021-05-12 11:57 ` Christoph Hellwig [this message]
2021-05-12 12:36 ` Hans de Goede
2021-05-18 9:28 ` [Intel-gfx] " Jani Nikula
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