linux-kernel - Re: [PATCH 4.4 034/131] lib/int

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

Message-ID: <20190402065958.GA21380@kroah.com>
Date:   Tue, 2 Apr 2019 08:59:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Anshul Garg <aksgarg1989@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Will Deacon <will.deacon@....com>,
        David Miller <davem@...emloft.net>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Kees Cook <keescook@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 4.4 034/131] lib/int_sqrt: optimize small argument

On Mon, Apr 01, 2019 at 10:42:52AM -0700, Joe Perches wrote:
> On Mon, 2019-04-01 at 19:01 +0200, Greg Kroah-Hartman wrote:
> > 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> If this is to be ported just for an optimization
> (which I think is dubious as it's not a bug fix),

Yes, it was requested to be backported because of that.

> why not port the __fls optimization too?
> 
> __fls has a bigger effect on performance.

What commit are you referring to?

thanks,

greg k-h