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Subject[PATCH] gpu: drm: v3d: use new return type vm_fault_t
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.

see commit 1c8f422059ae ("mm: change return type to vm_fault_t")
for reference.

Previously vm_insert_mixed returns err which driver
mapped into VM_FAULT_* type. The new function
vmf_insert_mixed will replace this inefficiency by
returning VM_FAULT_* type.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
---
drivers/gpu/drm/v3d/v3d_bo.c | 23 +++--------------------
drivers/gpu/drm/v3d/v3d_drv.h | 3 ++-
2 files changed, 5 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c
index 7b1e2a5..f4e8de4 100644
--- a/drivers/gpu/drm/v3d/v3d_bo.c
+++ b/drivers/gpu/drm/v3d/v3d_bo.c
@@ -227,37 +227,20 @@ struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj)
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
}

-int v3d_gem_fault(struct vm_fault *vmf)
+vm_fault_t v3d_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
struct v3d_bo *bo = to_v3d_bo(obj);
unsigned long pfn;
pgoff_t pgoff;
- int ret;

/* We don't use vmf->pgoff since that has the fake offset: */
pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
pfn = page_to_pfn(bo->pages[pgoff]);

- ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
-
- switch (ret) {
- case -EAGAIN:
- case 0:
- case -ERESTARTSYS:
- case -EINTR:
- case -EBUSY:
- /*
- * EBUSY is ok: this just means that another thread
- * already did the job.
- */
- return VM_FAULT_NOPAGE;
- case -ENOMEM:
- return VM_FAULT_OOM;
- default:
- return VM_FAULT_SIGBUS;
- }
+ return vmf_insert_mixed(vma, vmf->address,
+ __pfn_to_pfn_t(pfn, PFN_DEV));
}

int v3d_mmap(struct file *filp, struct vm_area_struct *vma)
diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index a043ac3..09aa634 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -2,6 +2,7 @@
/* Copyright (C) 2015-2018 Broadcom */

#include <linux/reservation.h>
+#include <linux/mm_types.h>
#include <drm/drmP.h>
#include <drm/drm_encoder.h>
#include <drm/drm_gem.h>
@@ -248,7 +249,7 @@ int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
-int v3d_gem_fault(struct vm_fault *vmf);
+vm_fault_t v3d_gem_fault(struct vm_fault *vmf);
int v3d_mmap(struct file *filp, struct vm_area_struct *vma);
struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj);
int v3d_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
--
1.9.1
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