linux-kernel - Re: [REGRESSION] [BISECTED] Panic in gen8_ggtt_insert

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Message-ID: <ZQnGMtm7zJ9E9a8R@casper.infradead.org>
Date:   Tue, 19 Sep 2023 17:02:58 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Aravind Iddamsetty <aravind.iddamsetty@...el.com>,
        Fei Yang <fei.yang@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [REGRESSION] [BISECTED] Panic in gen8_ggtt_insert_entries() with
 v6.5

On Tue, Sep 19, 2023 at 04:43:41PM +0100, Matthew Wilcox wrote:
> Could I ask you to try this patch?  I'll follow up with another patch
> later because I think I made another assumption that may not be valid.

Ah, no, never mind.  I thought we could start in the middle of a folio,
but we always start constructing the sg list from index 0 of the file,
so we always start at the first page of a folio.  If this patch solves
your problem, then I think we're done.