[PATCH 08/13] mm: introduce vma_get_page_prot() and use it

[Lorenzo Stoakes <ljs@kernel.org>]

There's a large number of vm_get_page_prot(vma->vm_flags) invocations. Make
life easier by introducing vma_get_page_prot() parameterised by the VMA.

This also makes converting vm_get_page_prot() to vma_flags_t easier.

Also update the userland VMA tests to reflect the change.

No functional change intended.

Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
 drivers/gpu/drm/drm_gem.c                   |  2 +-
 drivers/gpu/drm/drm_gem_dma_helper.c        |  2 +-
 drivers/gpu/drm/drm_gem_shmem_helper.c      |  2 +-
 drivers/gpu/drm/etnaviv/etnaviv_gem.c       |  2 +-
 drivers/gpu/drm/exynos/exynos_drm_gem.c     |  6 +++---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c    | 12 ++++++------
 drivers/gpu/drm/msm/msm_gem.c               |  2 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c       |  2 +-
 drivers/gpu/drm/omapdrm/omap_fbdev.c        |  2 +-
 drivers/gpu/drm/omapdrm/omap_gem.c          |  6 +++---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c |  2 +-
 drivers/gpu/drm/tegra/gem.c                 |  2 +-
 drivers/gpu/drm/virtio/virtgpu_vram.c       |  2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c  |  2 +-
 drivers/gpu/drm/xe/xe_device.c              |  2 +-
 drivers/gpu/drm/xe/xe_mmio_gem.c            |  2 +-
 drivers/gpu/drm/xen/xen_drm_front_gem.c     |  2 +-
 drivers/video/fbdev/core/fb_io_fops.c       |  2 +-
 include/linux/mm.h                          | 10 +++++++++-
 mm/vma.c                                    |  2 +-
 mm/vma_exec.c                               |  2 +-
 sound/core/memalloc.c                       |  2 +-
 tools/testing/vma/include/dup.h             |  4 ++++
 23 files changed, 43 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index e3ed684ddcf2..32a05d889b9a 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1252,7 +1252,7 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
 		}
 
 		vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
-		vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+		vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
 		vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 	}
 
diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
index 1c00a71ab3c9..7d9612075d31 100644
--- a/drivers/gpu/drm/drm_gem_dma_helper.c
+++ b/drivers/gpu/drm/drm_gem_dma_helper.c
@@ -540,7 +540,7 @@ int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *
 	vm_flags_mod(vma, VM_DONTDUMP | VM_DONTEXPAND, VM_PFNMAP);
 
 	if (dma_obj->map_noncoherent) {
-		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+		vma->vm_page_prot = vma_get_page_prot(vma);
 
 		ret = dma_mmap_pages(drm_dev_dma_dev(dma_obj->base.dev),
 				     vma, vma->vm_end - vma->vm_start,
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index c989459eb215..06d019d51d3e 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -764,7 +764,7 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct
 		return ret;
 
 	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 	if (shmem->map_wc)
 		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 2e4d6d117ee2..f9c8b7b2bfc7 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -133,7 +133,7 @@ static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 
 	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
 
-	vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vm_page_prot = vma_get_page_prot(vma);
 
 	if (etnaviv_obj->flags & ETNA_BO_WC) {
 		vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 9a6270f3dca6..0208c9259572 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -377,13 +377,13 @@ static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct
 
 	/* non-cachable as default. */
 	if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
-		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+		vma->vm_page_prot = vma_get_page_prot(vma);
 	else if (exynos_gem->flags & EXYNOS_BO_WC)
 		vma->vm_page_prot =
-			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+			pgprot_writecombine(vma_get_page_prot(vma));
 	else
 		vma->vm_page_prot =
-			pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+			pgprot_noncached(vma_get_page_prot(vma));
 
 	ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
 	if (ret)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 0644f85c6c8e..9ca90c1bb5b4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -112,7 +112,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 		vma = find_vma(mm, addr);
 		if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
 			vma->vm_page_prot =
-				pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+				pgprot_writecombine(vma_get_page_prot(vma));
 		else
 			addr = -ENOMEM;
 		mmap_write_unlock(mm);
@@ -1024,7 +1024,7 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
 	fput(anon);
 
 	if (obj->ops->mmap_ops) {
-		vma->vm_page_prot = pgprot_decrypted(vm_get_page_prot(vma->vm_flags));
+		vma->vm_page_prot = pgprot_decrypted(vma_get_page_prot(vma));
 		vma->vm_ops = obj->ops->mmap_ops;
 		vma->vm_private_data = obj->base.vma_node.driver_private;
 		return 0;
@@ -1035,7 +1035,7 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
 	switch (mmo->mmap_type) {
 	case I915_MMAP_TYPE_WC:
 		vma->vm_page_prot =
-			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+			pgprot_writecombine(vma_get_page_prot(vma));
 		vma->vm_ops = &vm_ops_cpu;
 		break;
 
@@ -1043,19 +1043,19 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
 		GEM_WARN_ON(1);
 		fallthrough;
 	case I915_MMAP_TYPE_WB:
-		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+		vma->vm_page_prot = vma_get_page_prot(vma);
 		vma->vm_ops = &vm_ops_cpu;
 		break;
 
 	case I915_MMAP_TYPE_UC:
 		vma->vm_page_prot =
-			pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+			pgprot_noncached(vma_get_page_prot(vma));
 		vma->vm_ops = &vm_ops_cpu;
 		break;
 
 	case I915_MMAP_TYPE_GTT:
 		vma->vm_page_prot =
-			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+			pgprot_writecombine(vma_get_page_prot(vma));
 		vma->vm_ops = &vm_ops_gtt;
 		break;
 	}
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index cbf723a5d86f..6a78e242de7c 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1125,7 +1125,7 @@ static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 
 	vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
-	vma->vm_page_prot = msm_gem_pgprot(msm_obj, vm_get_page_prot(vma->vm_flags));
+	vma->vm_page_prot = msm_gem_pgprot(msm_obj, vma_get_page_prot(vma));
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 20dba02d6175..9a6ee2e880c0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -55,7 +55,7 @@ static vm_fault_t nouveau_ttm_fault(struct vm_fault *vmf)
 		goto error_unlock;
 
 	nouveau_bo_del_io_reserve_lru(bo);
-	prot = vm_get_page_prot(vma->vm_flags);
+	prot = vma_get_page_prot(vma);
 	ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT);
 	nouveau_bo_add_io_reserve_lru(bo);
 	if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index ca3fb186bf19..4881777642d2 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -84,7 +84,7 @@ static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info
 
 static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
-	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+	vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
 
 	return fb_deferred_io_mmap(info, vma);
 }
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 00404fb6c29a..fb0e6f556b31 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -538,9 +538,9 @@ static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
 	vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP | VM_IO | VM_MIXEDMAP);
 
 	if (omap_obj->flags & OMAP_BO_WC) {
-		vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+		vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
 	} else if (omap_obj->flags & OMAP_BO_UNCACHED) {
-		vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+		vma->vm_page_prot = pgprot_noncached(vma_get_page_prot(vma));
 	} else {
 		/*
 		 * We do have some private objects, at least for scanout buffers
@@ -558,7 +558,7 @@ static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
 		vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
 		vma_set_file(vma, obj->filp);
 
-		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+		vma->vm_page_prot = vma_get_page_prot(vma);
 	}
 
 	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index b188539dca0b..9a1dc9f12072 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -255,7 +255,7 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 	 */
 	vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);
 
-	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+	vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
 	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 
 	if (rk_obj->pages)
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 1d8d27a5ea89..f76af733ea79 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -602,7 +602,7 @@ int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
 
 		vma->vm_pgoff = vm_pgoff;
 	} else {
-		pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+		pgprot_t prot = vma_get_page_prot(vma);
 
 		vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_vram.c b/drivers/gpu/drm/virtio/virtgpu_vram.c
index 4ae3cbc35dd3..544a6abddbc8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vram.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vram.c
@@ -55,7 +55,7 @@ static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
 
 	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
 	vm_flags_set(vma, VM_MIXEDMAP | VM_DONTEXPAND);
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
 	vma->vm_ops = &virtio_gpu_vram_vm_ops;
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
index 45561bc1c9ef..a9fd4015a0ca 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
@@ -481,7 +481,7 @@ vm_fault_t vmw_bo_vm_fault(struct vm_fault *vmf)
 	if (vbo->dirty && vbo->dirty->method == VMW_BO_DIRTY_MKWRITE)
 		prot = vm_get_page_prot(vma->vm_flags & ~VM_SHARED);
 	else
-		prot = vm_get_page_prot(vma->vm_flags);
+		prot = vma_get_page_prot(vma);
 
 	ret = ttm_bo_vm_fault_reserved(vmf, prot, num_prefault);
 	if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index d224861b6f6f..758acaae85d3 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -281,7 +281,7 @@ static vm_fault_t barrier_fault(struct vm_fault *vmf)
 	pgprot_t prot;
 	int idx;
 
-	prot = vm_get_page_prot(vma->vm_flags);
+	prot = vma_get_page_prot(vma);
 
 	if (drm_dev_enter(dev, &idx)) {
 		unsigned long pfn;
diff --git a/drivers/gpu/drm/xe/xe_mmio_gem.c b/drivers/gpu/drm/xe/xe_mmio_gem.c
index 8c803ef233cc..3741ae60f532 100644
--- a/drivers/gpu/drm/xe/xe_mmio_gem.c
+++ b/drivers/gpu/drm/xe/xe_mmio_gem.c
@@ -149,7 +149,7 @@ static int xe_mmio_gem_mmap(struct drm_gem_object *base, struct vm_area_struct *
 
 	/* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 */
 	vma->vm_pgoff = 0;
-	vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+	vma->vm_page_prot = pgprot_noncached(vma_get_page_prot(vma));
 	vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
 		     VM_DONTCOPY | VM_NORESERVE);
 
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index eec4c1da3f9e..dd158443f55f 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -80,7 +80,7 @@ static int xen_drm_front_gem_object_mmap(struct drm_gem_object *gem_obj,
 	 * which is mapped as Normal Inner Write-Back Outer Write-Back
 	 * Inner-Shareable.
 	 */
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 
 	/*
 	 * vm_operations_struct.fault handler will be called if CPU access
diff --git a/drivers/video/fbdev/core/fb_io_fops.c b/drivers/video/fbdev/core/fb_io_fops.c
index 6ab60fcd0050..6d0a8c8e141a 100644
--- a/drivers/video/fbdev/core/fb_io_fops.c
+++ b/drivers/video/fbdev/core/fb_io_fops.c
@@ -161,7 +161,7 @@ int fb_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
 		len = info->fix.mmio_len;
 	}
 
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 	vma->vm_page_prot = pgprot_framebuffer(vma->vm_page_prot, vma->vm_start,
 					       vma->vm_end, start);
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c8336f68d7bb..b55790c75038 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4575,6 +4575,10 @@ static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
 	return vm_get_page_prot(vm_flags);
 }
 
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+	return vma_flags_to_page_prot(vma->flags);
+}
 void vma_set_page_prot(struct vm_area_struct *vma);
 #else
 static inline pgprot_t vm_get_page_prot(vm_flags_t vm_flags)
@@ -4585,9 +4589,13 @@ static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
 {
 	return __pgprot(0);
 }
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+	return __pgprot(0);
+}
 static inline void vma_set_page_prot(struct vm_area_struct *vma)
 {
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 }
 #endif
 
diff --git a/mm/vma.c b/mm/vma.c
index fcdd2ac3ac68..b81c05e67a61 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -3429,7 +3429,7 @@ struct vm_area_struct *__install_special_mapping(
 	if (pgtable_supports_soft_dirty())
 		vm_flags |= VM_SOFTDIRTY;
 	vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 
 	vma->vm_ops = ops;
 	vma->vm_private_data = priv;
diff --git a/mm/vma_exec.c b/mm/vma_exec.c
index c0f7ba2cfb27..b01c4964f2c9 100644
--- a/mm/vma_exec.c
+++ b/mm/vma_exec.c
@@ -146,7 +146,7 @@ int create_init_stack_vma(struct mm_struct *mm, struct vm_area_struct **vmap,
 	if (pgtable_supports_soft_dirty())
 		flags |= VM_SOFTDIRTY;
 	vm_flags_init(vma, flags);
-	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_page_prot = vma_get_page_prot(vma);
 
 	err = insert_vm_struct(mm, vma);
 	if (err)
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 9320671dfcc8..5bc7e586b430 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -851,7 +851,7 @@ static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab)
 static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab,
 				    struct vm_area_struct *area)
 {
-	area->vm_page_prot = vm_get_page_prot(area->vm_flags);
+	area->vm_page_prot = vma_get_page_prot(area);
 	return dma_mmap_pages(dmab->dev.dev, area,
 			      area->vm_end - area->vm_start,
 			      virt_to_page(dmab->area));
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 1ffac38a5377..d86bef8cb37f 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1577,3 +1577,7 @@ static inline pgoff_t linear_page_index(const struct vm_area_struct *vma,
 	pgoff += vma_start_pgoff(vma);
 	return pgoff;
 }
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+	return vma_flags_to_page_prot(vma->flags);
+}
-- 
2.54.0