linux-kernel - Re: [PATCH v4 2/9] vsprintf: Consistent %pK handling for kptr

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Message-ID: <1523275919.21176.429.camel@linux.intel.com>
Date:   Mon, 09 Apr 2018 15:11:59 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        "Tobin C . Harding" <me@...in.cc>, Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v4 2/9] vsprintf: Consistent %pK handling for
 kptr_restrict == 0

On Mon, 2018-04-09 at 14:05 +0200, Petr Mladek wrote:
> On Sat 2018-04-07 17:08:18, Andy Shevchenko wrote:
> > On Thu, 2018-04-05 at 16:46 +0200, Petr Mladek wrote:
> > > On Thu 2018-04-05 16:04:45, Andy Shevchenko wrote:
> > > > On Wed, 2018-04-04 at 10:58 +0200, Petr Mladek wrote:

> > > > >  /* Maps a pointer to a 32 bit unique identifier. */
> > > > > -static char *ptr_to_id(char *buf, char *end, void *ptr,
> > > > > struct
> > > > > printf_spec spec)
> > > > > +static char *ptr_to_id(char *buf, char *end,
> > > > > +		       const void *ptr, struct printf_spec
> > > > > spec)
> > > > 
> > > > I don't think this change belongs to the patch.
> > > 
> > > The const should have been there from the beginning. I have found
> > > it
> > > because this patch added a call to ptr_to_id() which had the const
> > > and compiler warned about cast problems.
> > 
> > So, why not to do a separate patch with clear intention?
> 
> If you insist I could do it as separate patch.

I believe, that logical changes are easier to review and understand when
it's not mixed with other changes.

> > > IMHO, it is rather cosmetic change.
> > > From my experience I'm afraid of cosmetic changes in the patches
> > > which
> > 
> > might focus out attention on real fix.
> 
> I would understand this if it was part of a large patch that changed
> complex chain of functions. But this patch touched 5 lines. The const
> is added into static function that is almost leaf and was called
> only from a single location.

But it's up to you.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy