On pe, 2016-12-09 at 13:08 +0000, Chris Wilson wrote:
> Check that we can request alignment to any power-of-two or prime using a
> plain drm_mm_node_insert().
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
<SNIP>
> +static int igt_align(void *ignored)
> +{
> + struct drm_mm mm;
> + struct drm_mm_node *node, *next;
> + int ret = -EINVAL;
> + int n;
> +
> + drm_mm_init(&mm, 1, -2);
U64_MAX - 1?
> + if (!drm_mm_clean(&mm)) {
> + pr_err("mm not empty on creation\n");
> + goto out;
> + }
> +
Can be dropped.
> + for_each_prime(n, 8192) {
This is one more spot, how about DRM_SELFTEST_MAX_PRIME or so?
> + int err;
> +
> + node = kzalloc(sizeof(*node), GFP_KERNEL);
> + if (!node) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + err = drm_mm_insert_node_generic(&mm, node,
> + next_prime_number(n),/* size */
> + n, /* alignment */
<rant>If there just was a way of naming variables so this comments was
not needed.</rant> Maybe the variable could be "align".
> +static int igt_align_pot(int max)
> +{
> + struct drm_mm mm;
> + struct drm_mm_node *node, *next;
> + int bit;
> + int ret = -EINVAL;
> +
> + drm_mm_init(&mm, 1, -2);
> + if (!drm_mm_clean(&mm)) {
> + pr_err("mm not empty on creation\n");
> + goto out;
> + }
> +
> + for (bit = max - 1; bit; bit--) {
> + int err;
> +
> + node = kzalloc(sizeof(*node), GFP_KERNEL);
> + if (!node) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + err = drm_mm_insert_node_generic(&mm, node, 1,
> + BIT_ULL(bit), bit,
The color is not used, so just set it to 0.
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Regards, Joonas
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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