linux-kernel - [PATCH v2] gpu: drm: udl: Adding new typedef vm_fault

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Date:   Wed, 25 Apr 2018 10:29:22 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     airlied@...hat.com, christian.koenig@....com, cakturk@...il.com,
        seanpaul@...omium.org, daniel.vetter@...ll.ch, mhocko@...nel.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        willy@...radead.org
Subject: [PATCH v2] gpu: drm: udl: Adding new typedef vm_fault_t

Use new return type vm_fault_t for fault and huge_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.

Commit 1c8f422059ae ("mm: change return type to vm_fault_t")

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

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
v2: Updated the change log

 drivers/gpu/drm/udl/udl_drv.h |  3 ++-
 drivers/gpu/drm/udl/udl_gem.c | 15 ++-------------
 2 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index 2a75ab8..11151c4 100644
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -16,6 +16,7 @@

 #include <linux/usb.h>
 #include <drm/drm_gem.h>
+#include <linux/mm_types.h>

 #define DRIVER_NAME		"udl"
 #define DRIVER_DESC		"DisplayLink"
@@ -134,7 +135,7 @@ struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
 int udl_gem_vmap(struct udl_gem_object *obj);
 void udl_gem_vunmap(struct udl_gem_object *obj);
 int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
-int udl_gem_fault(struct vm_fault *vmf);
+vm_fault_t udl_gem_fault(struct vm_fault *vmf);

 int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
 		      int width, int height);
diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index dee6bd9..cf5fe35 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -100,13 +100,12 @@ int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 	return ret;
 }

-int udl_gem_fault(struct vm_fault *vmf)
+vm_fault_t udl_gem_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
 	struct page *page;
 	unsigned int page_offset;
-	int ret = 0;

 	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;

@@ -114,17 +113,7 @@ int udl_gem_fault(struct vm_fault *vmf)
 		return VM_FAULT_SIGBUS;

 	page = obj->pages[page_offset];
-	ret = vm_insert_page(vma, vmf->address, page);
-	switch (ret) {
-	case -EAGAIN:
-	case 0:
-	case -ERESTARTSYS:
-		return VM_FAULT_NOPAGE;
-	case -ENOMEM:
-		return VM_FAULT_OOM;
-	default:
-		return VM_FAULT_SIGBUS;
-	}
+	return vmf_insert_page(vma, vmf->address, page);
 }

 int udl_gem_get_pages(struct udl_gem_object *obj)
--
1.9.1