linux-kernel - [PATCH] kunit: drm: make DRM buddy test compatible with other pages sizes

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Date:   Tue, 18 Apr 2023 11:15:24 -0600
From:   Nico Pache <npache@...hat.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     matthew.auld@...el.com, arunpravin.paneerselvam@....com,
        arthurgrillo@...eup.net, davidgow@...gle.com, javierm@...hat.com,
        christian.koenig@....com, mairacanal@...eup.net, daniel@...ll.ch,
        airlied@...il.com, ddutile@...hat.com, kunit-dev@...glegroups.com
Subject: [PATCH] kunit: drm: make DRM buddy test compatible with other pages sizes

The DRM buddy test uses a fixed 12 bit shift to covert from pages to 
bytes. This number is then used to confirm that (chunk_size < PAGE_SIZE)
which can lead to a failing drm_buddy_init on systems with PAGE_SIZE > 4k.

Fixes: 92937f170d3f ("drm/selftests: add drm buddy alloc range testcase")
Signed-off-by: Nico Pache <npache@...hat.com>
---
 drivers/gpu/drm/tests/drm_buddy_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_buddy_test.c b/drivers/gpu/drm/tests/drm_buddy_test.c
index 09ee6f6af896..a62b2690d3c2 100644
--- a/drivers/gpu/drm/tests/drm_buddy_test.c
+++ b/drivers/gpu/drm/tests/drm_buddy_test.c
@@ -318,8 +318,8 @@ static void mm_config(u64 *size, u64 *chunk_size)
 	s &= -ms;
 
 	/* Convert from pages to bytes */
-	*chunk_size = (u64)ms << 12;
-	*size = (u64)s << 12;
+	*chunk_size = (u64)ms << PAGE_SHIFT;
+	*size = (u64)s << PAGE_SHIFT;
 }
 
 static void drm_test_buddy_alloc_pathological(struct kunit *test)
-- 
2.39.2