drm/gem: Fix builds with CONFIG_MMU=n

drm_gem_get_unmapped_area() relies on mm_get_unmapped_area() which is
only available if CONFIG_MMU=y.

Fixes: 99bda20d6d4c ("drm/gem: Introduce drm_gem_get_unmapped_area() fop")
Cc: Loïc Molinari <loic.molinari@collabora.com>
Reviewed-by: Loïc Molinari <loic.molinari@collabora.com>
Link: https://patch.msgid.link/20251209171151.2449120-1-boris.brezillon@collabora.com
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 6021c4087a083186ed9f9320b4f381a26525696a..ca1956608261249c6b0e0fec05c24d177e98b9f9 100644 (file)
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1267,6 +1267,7 @@ drm_gem_object_lookup_at_offset(struct file *filp, unsigned long start,
        return obj;
 }
 
+#ifdef CONFIG_MMU
 /**
  * drm_gem_get_unmapped_area - get memory mapping region routine for GEM objects
  * @filp: DRM file pointer
@@ -1309,6 +1310,7 @@ unsigned long drm_gem_get_unmapped_area(struct file *filp, unsigned long uaddr,
        return ret;
 }
 EXPORT_SYMBOL_GPL(drm_gem_get_unmapped_area);
+#endif
 
 /**
  * drm_gem_mmap - memory map routine for GEM objects

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index cca815dc87f3aaeff397bbd815c2ee30ffe2197b..f4da8ed0d630196d63b1820546e404b8dc047b69 100644 (file)
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -537,9 +537,14 @@ void drm_gem_vm_close(struct vm_area_struct *vma);
 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
                     struct vm_area_struct *vma);
 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
+
+#ifdef CONFIG_MMU
 unsigned long drm_gem_get_unmapped_area(struct file *filp, unsigned long uaddr,
                                        unsigned long len, unsigned long pgoff,
                                        unsigned long flags);
+#else
+#define drm_gem_get_unmapped_area NULL
+#endif
 
 /**
  * drm_gem_object_get - acquire a GEM buffer object reference