linux/drivers/gpu
David Gow 4453545b5b drm: buddy_allocator: Fix buddy allocator init on 32-bit systems
The drm buddy allocator tests were broken on 32-bit systems, as
rounddown_pow_of_two() takes a long, and the buddy allocator handles
64-bit sizes even on 32-bit systems.

This can be reproduced with the drm_buddy_allocator KUnit tests on i386:
	./tools/testing/kunit/kunit.py run --arch i386 \
	--kunitconfig ./drivers/gpu/drm/tests drm_buddy

(It results in kernel BUG_ON() when too many blocks are created, due to
the block size being too small.)

This was independently uncovered (and fixed) by Luís Mendes, whose patch
added a new u64 variant of rounddown_pow_of_two(). This version instead
recalculates the size based on the order.

Reported-by: Luís Mendes <luis.p.mendes@gmail.com>
Link: https://lore.kernel.org/lkml/CAEzXK1oghXAB_KpKpm=-CviDQbNaH0qfgYTSSjZgvvyj4U78AA@mail.gmail.com/T/
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <arunpravin.paneerselvam@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329065532.2122295-1-davidgow@google.com
Signed-off-by: Christian König <christian.koenig@amd.com>
2023-03-29 17:14:07 +02:00
..
drm drm: buddy_allocator: Fix buddy allocator init on 32-bit systems 2023-03-29 17:14:07 +02:00
host1x IOMMU Updates for Linux v6.3: 2023-02-24 13:40:13 -08:00
ipu-v3 gpu: ipu-v3: common: Add of_node_put() for reference returned by of_graph_get_port_by_id() 2022-12-16 18:40:29 +01:00
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vga
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