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Diffstat (limited to 'drivers/gpu/drm/drm_mm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mm.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 189ab84c5a59..0441d84fba74 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -742,8 +742,12 @@ void drm_mm_scan_init_with_range(struct drm_mm_scan *scan, scan->mm = mm; + if (alignment <= 1) + alignment = 0; + scan->color = color; scan->alignment = alignment; + scan->remainder_mask = is_power_of_2(alignment) ? alignment - 1 : 0; scan->size = size; scan->flags = flags; @@ -811,7 +815,10 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan, if (scan->alignment) { u64 rem; - div64_u64_rem(adj_start, scan->alignment, &rem); + if (likely(scan->remainder_mask)) + rem = adj_start & scan->remainder_mask; + else + div64_u64_rem(adj_start, scan->alignment, &rem); if (rem) { adj_start -= rem; if (scan->flags != DRM_MM_CREATE_TOP) |