linux-kernel - Re: [PATCH] gpu: drm: tegra: Adding new typedef vm_fault

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Date:   Wed, 18 Apr 2018 16:39:22 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     airlied@...ux.ie, jonathanh@...dia.com,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] gpu: drm: tegra: Adding new typedef vm_fault_t

> This new function returns VM_FAULT_NOPAGE only for 0 and -EBUSY, whereas
> we used to return VM_FAULT_NOPAGE for -EAGAIN, -ERESTARTSYS and -EINTR
> as well.

Previously vm_insert_page unable to return VM_FAULT_ type due to which
different drivers
have their own mapping from err to VM_FAULT_ type. With new
vmf_insert_page() introduce
in 4.17-rc1 we have a common mapping for err to VM_FAULT_ which remain
same for every
drivers/file systems.

Was this previously wrong?

I think Matthew is the right person to answer this.