From: jsg <jsg@openbsd.org>
Date: Thu, 27 Apr 2023 02:32:24 +0000 (+0000)
Subject: drm: buddy_allocator: Fix buddy allocator init on 32-bit systems
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=3e7f292e51eab4a7b426647d5bcb85a8455e96bb;p=openbsd

drm: buddy_allocator: Fix buddy allocator init on 32-bit systems

From David Gow
fb766acce3cf1c9637a79c1ffb3cebc61fd9d859 in linux-6.1.y/6.1.26
4453545b5b4c3eff941f69a5530f916d899db025 in mainline linux
---

diff --git a/sys/dev/pci/drm/drm_buddy.c b/sys/dev/pci/drm/drm_buddy.c
index 083aec8cc49..f18e7a72248 100644
--- a/sys/dev/pci/drm/drm_buddy.c
+++ b/sys/dev/pci/drm/drm_buddy.c
@@ -156,8 +156,8 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size)
 		unsigned int order;
 		u64 root_size;
 
-		root_size = rounddown_pow_of_two(size);
-		order = ilog2(root_size) - ilog2(chunk_size);
+		order = ilog2(size) - ilog2(chunk_size);
+		root_size = chunk_size << order;
 
 		root = drm_block_alloc(mm, NULL, order, offset);
 		if (!root)