> May I ask how exactly you spotted the "shift-31-problem" in > drivers/i2c/busses/i2c-rcar.c: > - visual code review? > - static analysis, special compiler flags?
This one. I run a set of static code analyziers when applying patches.
One of them is 'cppcheck' which reported it.
> According to feedback from GCC community [2], with 'gcc -std=gnu89',
> shifting into (not past) the sign bit is "defined behavior" which is why
> UBSAN doesn't report this as an issue in Linux kernel. That makes me
I see. I guess it can be argued. Yet, BIT() solves other issues as well
('1' vs '1u'), so this was probably a reasonable move nonetheless, plus
we are super-super-sure about the shifting now.
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