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drm/gem: Fix builds with CONFIG_MMU=n

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

Fixes: 99bda20d6d ("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>
This commit is contained in:
Boris Brezillon 2025-12-09 18:11:51 +01:00
parent 22ba3bb3ff
commit ad9f266be8
2 changed files with 7 additions and 0 deletions
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2
drivers/gpu/drm/drm_gem.c
View File

@ -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

5
include/drm/drm_gem.h
View File

@ -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