linux-kernel - Re: [PATCHv4 1/5] x86/mm: split arch_mmap

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Date:   Mon, 13 Feb 2017 12:22:54 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        open list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>, X86 ML <x86@...nel.org>,
        linux-mm@...ck.org
Subject: Re: [PATCHv4 1/5] x86/mm: split arch_mmap_rnd() on compat/native
 versions

On Mon, 13 Feb 2017, Dmitry Safonov wrote:
> On 02/11/2017 11:23 AM, Thomas Gleixner wrote:
> > On Sat, 11 Feb 2017, Dmitry Safonov wrote:
> > 
> > > 2017-02-10 23:10 GMT+03:00 Thomas Gleixner <tglx@...utronix.de>:
> > > > On Thu, 9 Feb 2017, Borislav Petkov wrote:
> > > > > I can't say that I'm thrilled about the ifdeffery this is adding.
> > > > > 
> > > > > But I can't think of a cleaner approach at a quick glance, though -
> > > > > that's generic and arch-specific code intertwined muck. Sad face.
> > > > 
> > > > It's trivial enough to do ....
> > > > 
> > > > Thanks,
> > > > 
> > > >         tglx
> > > > 
> > > > ---
> > > >  arch/x86/mm/mmap.c |   22 ++++++++++------------
> > > >  1 file changed, 10 insertions(+), 12 deletions(-)
> > > > 
> > > > --- a/arch/x86/mm/mmap.c
> > > > +++ b/arch/x86/mm/mmap.c
> > > > @@ -55,6 +55,10 @@ static unsigned long stack_maxrandom_siz
> > > >  #define MIN_GAP (128*1024*1024UL + stack_maxrandom_size())
> > > >  #define MAX_GAP (TASK_SIZE/6*5)
> > > > 
> > > > +#ifndef CONFIG_COMPAT
> > > > +# define mmap_rnd_compat_bits  mmap_rnd_bits
> > > > +#endif
> > > > +
> > > 
> > > >From my POV, I can't say that it's clearer to shadow mmap_compat_bits
> > > like that then to have two functions with native/compat names.
> > > But if you insist, I'll resend patches set with your version.
> > 
> > You can make that
> > 
> > #ifdef CONFIG_64BIT
> > # define mmap32_rnd_bits  mmap_compat_rnd_bits
> > # define mmap64_rnd_bits  mmap_rnd_bits
> > #else
> > # define mmap32_rnd_bits  mmap_rnd_bits
> > # define mmap64_rnd_bits  mmap_rnd_bits
> > #endif
> > 
> > and use that. That's still way more readable than the unholy ifdef mess.
> 
> Ok, will send this version in v5.
> Ping me if you mind me using your SOB for this patch.

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