[PATCH v6 1/9] drm/managed: implement managed versions of kzalloc_obj/objs()

[Dmitry Baryshkov]

The kzalloc_obj() and kzalloc_objs() functions proven to be useful and
widely used for the reset of the kernel. Implement a drm_device-managed
versions of those macros to mix the nice interface with the automatic
freeing of the pointers.

Note: the original macros accept optional GFP_foo arguments. They are
skipped for now, making all allocations use GFP_KERNEL. If necessary,
support for overriding the GFP type can be introduced later.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
---
 include/drm/drm_managed.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h
index 72d0d68be226..79049bec277d 100644
--- a/include/drm/drm_managed.h
+++ b/include/drm/drm_managed.h
@@ -105,6 +105,28 @@ static inline void *drmm_kcalloc(struct drm_device *dev,
 	return drmm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 }
 
+/**
+ * drmm_kzalloc_objs - &drm_device-managed kzalloc_objs()
+ * @dev: DRM device
+ * @p: Variable or type to allocate an array of
+ * @count: How many elements in the array
+ *
+ * Returns: newly allocated pointer to the zeroed array of @P on success, or
+ * NULL on failure.
+ */
+#define drmm_kzalloc_objs(dev, p, count) \
+	drmm_kcalloc(dev, count, sizeof(typeof(p)), GFP_KERNEL)
+
+/**
+ * drmm_kzalloc_obj - &drm_device-managed kzalloc_obj()
+ * @dev: DRM device
+ * @p: Variable or type to allocate
+ *
+ * Returns: newly allocated pointer to a @p on success, or NULL on failure.
+ */
+#define drmm_kzalloc_obj(dev, P) \
+	drmm_kzalloc_objs(dev, P, 1)
+
 char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp);
 
 void drmm_kfree(struct drm_device *dev, void *data);

-- 
2.47.3