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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 2 Mar 2017 12:19:48 -0800
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Subject: Re: gcc7 log2 compile issues in kernel/time/timekeeping.c
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>,
        Laura Abbott <labbott@redhat.com>, Will Deacon <will.deacon@arm.com>,
        John Stultz <john.stultz@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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I can't take this compiler braindamage any more, so I just decided to
remove the ____ilog2_NaN checks, and return 0 for any constant value <
2.

It's commit 474c90156c8d ("give up on gcc ilog2() constant
optimizations") in my tree. I'll push it out later after my usual
build tests (and I have a few other pulls to do).

                       Linus