linux-kernel - Re: [PATCH 11/12] sched: use for_each

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Message-ID: <20180709163023.GB2476@hirez.programming.kicks-ass.net>
Date:   Mon, 9 Jul 2018 18:30:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 11/12] sched: use for_each_if in topology.h

On Mon, Jul 09, 2018 at 05:52:04PM +0200, Daniel Vetter wrote:
> for_each_something(foo)
> 	if (foo->bla)
> 		call_bla(foo);
> 	else
> 		call_default(foo);

Note that the kernel coding style 'discourages' this style and would
like you to write:

	for_each_something(foo) {
		if (foo->bla)
			call_bla(foo);
		else
			call_default(foo);
	}

Which avoids the entire problem. See CodingStyle-3:

  Also, use braces when a loop contains more than a single simple statement:

  .. code-block:: c

	  while (condition) {
		  if (test)
			  do_something();
	  }