Patch Set 1:

can't see an error [-Werror=sign-compare] on 'acpi_device.c' here : https://qa.coreboot.org/job/coreboot-gerrit/97548/consoleFull

I think -Wtype-limits is more in line with what you're looking for, but that doesn't catch it since <= 0 is still valid for unsigned types. -Wconversion would catch it though

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