linux-kernel - Re: [PATCH 2/2] powerpc, ftrace: use create

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Date:	Sat, 14 Feb 2009 10:20:39 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Michael Ellerman <michael@...erman.id.au>
cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Geoff Levand <geoffrey.levand@...sony.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/2] powerpc, ftrace: use create_branch lib function



On Sun, 15 Feb 2009, Michael Ellerman wrote:
> >  
> >  	/* if (link) set op to 'bl' else 'b' */
> > -	op = 0x48000000 | (link ? 1 : 0);
> > -	op |= (ftrace_calc_offset(ip, addr) & 0x03fffffc);
> > +	op = create_branch((unsigned int *)ip, addr, link ? 1 : 0);
> 
> If I was feeling nit-picky I'd say you should use:
> 
> op = create_branch((unsigned int *)ip, addr, link ? BRANCH_SET_LINK : 0);
> 
> 
> But admittedly we're unlikely to ever change the flag handling, so it's
> probably not worth the effort of a respin (or this email :).

Not worth the effort of a respin, I agree.

But it would be worth the effort of a clean up patch ;-)

Not for "oh this flag might change", but for reviewers looking at the
code and knowing exactly what that '1' means.

-- Steve

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