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

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Message-ID: <20190402111003.GB18896@kroah.com>
Date:   Tue, 2 Apr 2019 13:10:03 +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 Tue, Apr 02, 2019 at 02:00:06AM -0700, Joe Perches wrote:
> On Tue, 2019-04-02 at 08:59 +0200, Greg Kroah-Hartman wrote:
> > 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?
> 
> f8ae107eef209bff29a5816bc1aad40d5cd69a80

Thanks for the commit id, I'll look into adding that to a later round of
kernel releases.

greg k-h