linux-kernel - Re: [PATCH] perf tests: initialize sa.sa

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Message-ID: <20160302132323.GP3604@kernel.org>
Date:	Wed, 2 Mar 2016 10:23:23 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Colin King <colin.king@...onical.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tests: initialize sa.sa_flags

Em Wed, Mar 02, 2016 at 02:21:27PM +0100, Peter Zijlstra escreveu:
> On Wed, Mar 02, 2016 at 10:03:50AM -0300, Arnaldo Carvalho de Melo wrote:
> > > Would not something like:
> > > 
> > > 	sa = (struct sigaction){
> > > 		.sa_sigaction = segfault_handler,
> > > 	};
> > > 	sigfillset(&sa.sa_mask);
> > > 
> > > Be better?
> > 
> > I thought about that, but isn't that set in stone? This would be a 4
> > liner, while his is a one' :-)
> 
> Dunno, you're right that its rather unlikely struct sigaction is going
> to grow another member, but I like the above pattern better in general,
> makes it harder to end up with uninitalized bits.
> 
> When performance matters the above pattern isn't ideal, but that should
> not be a concern here.

Right, I also always use :


	struct foo bar = {
		.baz = 1,
		.name = "whatever",
	};

Even more compact than using that cast. But didn't bother changing in
this case.

- Arnaldo