Messages in this thread | | | Date | Sat, 24 Sep 2016 10:15:15 +0100 | From | Russell King - ARM Linux <> | Subject | Re: UBSAN: Undefined behaviour in ./arch/arm/include/asm/bitops.h |
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On Sat, Sep 24, 2016 at 01:45:33PM +0900, Seung-Woo Kim wrote: > With the patch "arm: ubsan: select ARCH_HAS_UBSAN_SANITIZE_ALL", I got > following UBSAN warning on Exynos5422 SoC board.
Well, the simple solution is to have fls() and ffs() take unsigned int arguments rather than ints - but the question that brings up is: why do both of these take signed ints? It seems at least to me that it would be more sensible for these to take unsigned int, or even unsigned long like the other bitops do.
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