From: Koen Koning <[email protected]>
Use subsys_initcall instead of module_init for the GPU buddy allocator,
so its initialization code runs before any gpu drivers.
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]
Cc: Peter Senna Tschudin <[email protected]>
Cc: Matthew Auld <[email protected]>
Signed-off-by: Koen Koning <[email protected]>
Reviewed-by: Joel Fernandes <[email protected]>
Signed-off-by: Joel Fernandes <[email protected]>
---
drivers/gpu/buddy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/buddy.c b/drivers/gpu/buddy.c
index 603c59a2013a..81f57fdf913b 100644
--- a/drivers/gpu/buddy.c
+++ b/drivers/gpu/buddy.c
@@ -1315,7 +1315,7 @@ static int __init gpu_buddy_module_init(void)
return 0;
}
-module_init(gpu_buddy_module_init);
+subsys_initcall(gpu_buddy_module_init);
module_exit(gpu_buddy_module_exit);
MODULE_DESCRIPTION("GPU Buddy Allocator");
--
2.34.1
