linux-kernel - Re: gcc7 log2 compile issues in kernel/time/timekeeping.c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CA+55aFz-7bvR=_6zw24_9rXDE9Ly8PH5HF_3u5pX4cy9FA-T0A@mail.gmail.com>
Date:   Thu, 2 Mar 2017 12:19:48 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Markus Trippelsdorf <markus@...ppelsdorf.de>,
        Laura Abbott <labbott@...hat.com>,
        Will Deacon <will.deacon@....com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: gcc7 log2 compile issues in kernel/time/timekeeping.c

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