linux-kernel - Re: [PATCH v1] kernel.h: Split out mathematical helpers

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Date:   Tue, 4 Feb 2020 15:41:47 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1] kernel.h: Split out mathematical helpers

On Wed, Oct 02, 2019 at 05:13:37PM -0700, Andrew Morton wrote:
> On Tue, 10 Sep 2019 13:51:05 +0300 Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> 
> > kernel.h is being used as a dump for all kinds of stuff for a long time.
> > Here is the attempt to start cleaning it up by splitting out mathematical
> > helpers.
> > 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> >  fs/nfs/callback_proc.c        |   1 +
> >  include/linux/bitops.h        |   3 +-
> >  include/linux/dcache.h        |   1 +
> >  include/linux/iommu-helper.h  |   1 +
> >  include/linux/kernel.h        | 143 --------------------------------
> >  include/linux/math.h          | 149 ++++++++++++++++++++++++++++++++++
> >  include/linux/rcu_node_tree.h |   2 +
> 
> I'm not really understanding how this works, apart from "dumb luck".

Looks like it right now.

> Random example: mm/percpu.c needs roundup(), so how does it include the
> new math.h?
> 
> ....... ./arch/x86/include/asm/uprobes.h
> ........ ./include/linux/notifier.h
> ......... ./include/linux/mutex.h
> ......... ./include/linux/srcu.h
> .......... ./include/linux/workqueue.h
> ........... ./include/linux/timer.h
> ............ ./include/linux/ktime.h
> ............. ./include/linux/time.h
> .............. ./include/linux/time32.h
> ............... ./include/linux/timex.h
> ................ ./include/uapi/linux/timex.h
> ................. ./include/linux/time.h
> ................ ./include/uapi/linux/param.h
> ................. ./arch/x86/include/generated/uapi/asm/param.h
> .................. ./include/asm-generic/param.h
> ................... ./include/uapi/asm-generic/param.h
> ................ ./arch/x86/include/asm/timex.h
> ................. ./arch/x86/include/asm/tsc.h
> ............. ./include/linux/jiffies.h
> .............. ./arch/x86/include/generated/uapi/asm/param.h
> .............. ./include/generated/timeconst.h
> ............. ./include/linux/timekeeping.h
> ............. ./include/linux/timekeeping32.h
> ............ ./include/linux/debugobjects.h
> .......... ./include/linux/rcu_segcblist.h
> .......... ./include/linux/srcutree.h
> ........... ./include/linux/rcu_node_tree.h
> ............ ./include/linux/math.h
> 
> oh, like that.

Long way to clean up this...

> It seems rather unreliable.  Perhaps a "#include <linux/math.h>" was
> intended in kernel.h?

Yeah, this needs to be done for time being in hope that it will be clearer in
the future. I'll do this in v2.

Thanks for review!

-- 
With Best Regards,
Andy Shevchenko