Move buddy to the start of the link order, so its __init runs before any
other built-in drivers that may depend on it. Otherwise, a built-in
driver that tries to use the buddy allocator will run into a kernel NULL
pointer dereference because slab_blocks is uninitialized.
Specifically, this fixes drm/xe (as built-in) running into a kernel
panic during boot, because it uses buddy during device probe.
Fixes: ba110db8e1bc ("gpu: Move DRM buddy allocator one level up (part two)")
Cc: Joel Fernandes <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: [email protected]
Tested-by: Peter Senna Tschudin <[email protected]>
Signed-off-by: Koen Koning <[email protected]>
---
drivers/gpu/Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
index 5cd54d06e262..b4e5e338efa2 100644
--- a/drivers/gpu/Makefile
+++ b/drivers/gpu/Makefile
@@ -2,8 +2,9 @@
# drm/tegra depends on host1x, so if both drivers are built-in care must be
# taken to initialize them in the correct order. Link order is the only way
# to ensure this currently.
+# Similarly, buddy must come first since it is used by other drivers.
+obj-$(CONFIG_GPU_BUDDY) += buddy.o
obj-y += host1x/ drm/ vga/ tests/
obj-$(CONFIG_IMX_IPUV3_CORE) += ipu-v3/
obj-$(CONFIG_TRACE_GPU_MEM) += trace/
obj-$(CONFIG_NOVA_CORE) += nova-core/
-obj-$(CONFIG_GPU_BUDDY) += buddy.o
--
2.48.1
