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

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Message-ID: <20180510185138.GL33053@art_vandelay>
Date:   Thu, 10 May 2018 14:51:38 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] gpu: drm: vgem: Change return type to vm_fault_t

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.

So, for now,

Reviewed-by: Sean Paul <seanpaul@...omium.org>


-- 
Sean Paul, Software Engineer, Google / Chromium OS