Hi Ashutosh, On Fri, May 12, 2023 at 01:37:35PM -0700, Ashutosh Dixit wrote: > 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> pushed in drm-intel-gt-next. Thanks, Andi > --- > 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
