linux-kernel - Re: [PATCH] gpu: drm: vgem: Change return type to vm_fault_t

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Message-ID: <CAFqt6zZ+ExTFKmzRycJiSW-u718pbGm1Ute+1UXF2NPn1WpLfA@mail.gmail.com>
Date:   Wed, 23 May 2018 15:05:35 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Sean Paul <seanpaul@...omium.org>,
        Souptick Joarder <jrdr.linux@...il.com>,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] gpu: drm: vgem: Change return type to vm_fault_t

On Mon, May 14, 2018 at 9:56 PM, Daniel Vetter <daniel@...ll.ch> wrote:
> On Thu, May 10, 2018 at 02:51:38PM -0400, Sean Paul wrote:
>> On Thu, May 10, 2018 at 07:58:11PM +0530, Souptick Joarder wrote:
>> > Hi Sean,
>> >
>> > On Mon, Apr 16, 2018 at 8:32 PM, Souptick Joarder <jrdr.linux@...il.com> wrote:
>> > > Use new return type vm_fault_t for fault handler.
>> > >
>> > > Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>> > > Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
>> > > ---
>> > >  drivers/gpu/drm/vgem/vgem_drv.c | 5 ++---
>> > >  1 file changed, 2 insertions(+), 3 deletions(-)
>> > >
>> > > diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
>> > > index 2524ff1..c64a859 100644
>> > > --- a/drivers/gpu/drm/vgem/vgem_drv.c
>> > > +++ b/drivers/gpu/drm/vgem/vgem_drv.c
>> > > @@ -61,13 +61,13 @@ static void vgem_gem_free_object(struct drm_gem_object *obj)
>> > >         kfree(vgem_obj);
>> > >  }
>> > >
>> > > -static int vgem_gem_fault(struct vm_fault *vmf)
>> > > +static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
>> > >  {
>> > >         struct vm_area_struct *vma = vmf->vma;
>> > >         struct drm_vgem_gem_object *obj = vma->vm_private_data;
>> > >         /* We don't use vmf->pgoff since that has the fake offset */
>> > >         unsigned long vaddr = vmf->address;
>> > > -       int ret;
>> > > +       vm_fault_t ret = VM_FAULT_SIGBUS;
>> > >         loff_t num_pages;
>> > >         pgoff_t page_offset;
>> > >         page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
>> > > @@ -77,7 +77,6 @@ static int vgem_gem_fault(struct vm_fault *vmf)
>> > >         if (page_offset > num_pages)
>> > >                 return VM_FAULT_SIGBUS;
>> > >
>> > > -       ret = -ENOENT;
>> > >         mutex_lock(&obj->pages_lock);
>> > >         if (obj->pages) {
>> > >                 get_page(obj->pages[page_offset]);
>> > > --
>> > > 1.9.1
>> > >
>> >
>> > Any further comment on this patch ?
>>
>> Patch looks good to me. My build test fails, though, since vm_fault_t doesn't
>> exist in drm-misc-next yet.
>
> vm_fault_t is already in upstream, just needs Maarten to do a backmerge.
> Which I think he's done by now ... Otherwise nag him more :-)
> -Daniel
>
>>
>> So, for now,
>>
>> Reviewed-by: Sean Paul <seanpaul@...omium.org>
>>
>>
>> --
>> Sean Paul, Software Engineer, Google / Chromium OS
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

Daniel/ Sean, is this patch already merged for 4.18 ?

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