Loading i915 on UBSAN enabled kernels (CONFIG_UBSAN/CONFIG_UBSAN_BOOL) causes the following warning: UBSAN: invalid-load in drivers/gpu/drm/i915/gt/uc/intel_uc.c:558:2 load of value 255 is not a valid value for type '_Bool' Call Trace: dump_stack_lvl+0x57/0x7d ubsan_epilogue+0x5/0x40 __ubsan_handle_load_invalid_value.cold+0x43/0x48 __uc_init_hw+0x76a/0x903 [i915] ... i915_driver_probe+0xfb1/0x1eb0 [i915] i915_pci_probe+0xbe/0x2d0 [i915] The warning happens because during probe i915_hwmon is still not available which results in the output boolean variable *old remaining uninitialized. Silence the warning by initializing the variable to an arbitrary value. v2: Move variable initialization to the declaration (Andi) Signed-off-by: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx> Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/uc/intel_uc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c index 1381943b8973d..c8b9cbb7ba3a9 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c @@ -465,7 +465,7 @@ static int __uc_init_hw(struct intel_uc *uc) struct intel_guc *guc = &uc->guc; struct intel_huc *huc = &uc->huc; int ret, attempts; - bool pl1en; + bool pl1en = false; GEM_BUG_ON(!intel_uc_supports_guc(uc)); GEM_BUG_ON(!intel_uc_wants_guc(uc)); -- 2.38.0
