Re: [PATCH 3/3] mm/nommu: drop unlikely behind BUG_ON()

Davidlohr Bueso
2015-10-05T02:04:25Z

On Sun, 04 Oct 2015, Leon Romanovsky wrote:

>On Sun, Oct 4, 2015 at 9:18 AM, Geliang Tang <geliangtang@163.com> wrote:
>> BUG_ON() already contain an unlikely compiler flag. Drop it.
>It is not the case if CONFIG_BUG and HAVE_ARCH_BUG_ON are not set.

Yeah, but that's like the 1% of the cases -- and those probably don't even care
about the branch prediction (I could be wrong). So overall I like getting rid of
explicit BUG_ON(unlikely(... calls. In fact there's a _reason_ why there are so
few of them in the kernel.

Thanks,
Davidlohr