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drm/armada: Adding new typedef vm_fault_t

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Use new return type vm_fault_t for fault handler in struct
vm_operations_struct. 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.

commit 1c8f422059 ("mm: change return type to vm_fault_t")

Previously vm_insert_pfn() returns err which driver mapped into
VM_FAULT_* type. The new function vmf_insert_pfn() will replace this
inefficiency by returning VM_FAULT_* type.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Souptick Joarder 2018-07-30 11:52:31 +01:00 committed by Russell King
parent 830aadceae
commit 7794ec7774
1 changed files with 2 additions and 13 deletions
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15
drivers/gpu/drm/armada/armada_gem.c
View file

@ -13,25 +13,14 @@
#include <drm/armada_drm.h>
#include "armada_ioctlP.h"
static int armada_gem_vm_fault(struct vm_fault *vmf)
static vm_fault_t armada_gem_vm_fault(struct vm_fault *vmf)
{
struct drm_gem_object *gobj = vmf->vma->vm_private_data;
struct armada_gem_object *obj = drm_to_armada_gem(gobj);
unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
int ret;
pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
switch (ret) {
case 0:
case -EBUSY:
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
default:
return VM_FAULT_SIGBUS;
}
return vmf_insert_pfn(vmf->vma, vmf->address, pfn);
}
const struct vm_operations_struct armada_gem_vm_ops = {