On Tue, 17 Apr 2018, Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote:
> Use new return type vm_fault_t for fault handler. For
> now, this is just documenting that the function returns
> a VM_FAULT value rather than an errno. Once all instances
> are converted, vm_fault_t will become a distinct type.
>
> Reference id -> 1c8f422059ae ("mm: change return type to
> vm_fault_t")
>
> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 3 ++-
> drivers/gpu/drm/i915/i915_gem.c | 15 ++++++++-------
> 2 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index a42deeb..95b0d50 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -51,6 +51,7 @@
> #include <drm/drm_gem.h>
> #include <drm/drm_auth.h>
> #include <drm/drm_cache.h>
> +#include <linux/mm_types.h>
>
> #include "i915_params.h"
> #include "i915_reg.h"
> @@ -3363,7 +3364,7 @@ int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
> unsigned int flags);
> int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv);
> void i915_gem_resume(struct drm_i915_private *dev_priv);
> -int i915_gem_fault(struct vm_fault *vmf);
> +vm_fault_t i915_gem_fault(struct vm_fault *vmf);
> int i915_gem_object_wait(struct drm_i915_gem_object *obj,
> unsigned int flags,
> long timeout,
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index dd89abd..bdac690 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1882,7 +1882,7 @@ int i915_gem_mmap_gtt_version(void)
> * The current feature set supported by i915_gem_fault() and thus GTT mmaps
> * is exposed via I915_PARAM_MMAP_GTT_VERSION (see i915_gem_mmap_gtt_version).
> */
> -int i915_gem_fault(struct vm_fault *vmf)
> +vm_fault_t i915_gem_fault(struct vm_fault *vmf)
> {
> #define MIN_CHUNK_PAGES ((1 << 20) >> PAGE_SHIFT) /* 1 MiB */
> struct vm_area_struct *area = vmf->vma;
> @@ -1895,6 +1895,7 @@ int i915_gem_fault(struct vm_fault *vmf)
> pgoff_t page_offset;
> unsigned int flags;
> int ret;
> + vm_fault_t retval;
What's the point of changing the name? An unnecessary change.
BR,
Jani.
>
> /* We don't use vmf->pgoff since that has the fake offset */
> page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
> @@ -2000,7 +2001,7 @@ int i915_gem_fault(struct vm_fault *vmf)
> * and so needs to be reported.
> */
> if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
> - ret = VM_FAULT_SIGBUS;
> + retval = VM_FAULT_SIGBUS;
> break;
> }
> case -EAGAIN:
> @@ -2017,21 +2018,21 @@ int i915_gem_fault(struct vm_fault *vmf)
> * EBUSY is ok: this just means that another thread
> * already did the job.
> */
> - ret = VM_FAULT_NOPAGE;
> + retval = VM_FAULT_NOPAGE;
> break;
> case -ENOMEM:
> - ret = VM_FAULT_OOM;
> + retval = VM_FAULT_OOM;
> break;
> case -ENOSPC:
> case -EFAULT:
> - ret = VM_FAULT_SIGBUS;
> + retval = VM_FAULT_SIGBUS;
> break;
> default:
> WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
> - ret = VM_FAULT_SIGBUS;
> + retval = VM_FAULT_SIGBUS;
> break;
> }
> - return ret;
> + return retval;
> }
>
> static void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
> --
> 1.9.1
>
--
Jani Nikula, Intel Open Source Technology Center
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