linux-kernel - Re: [patch 2/2] lockdep: initialize lockdep debugging statistics

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Date:	Fri, 06 Mar 2009 11:19:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] lockdep: initialize lockdep debugging statistics

On Fri, 2009-03-06 at 01:56 -0800, David Rientjes wrote:
> 
> Peter, this is purely a matter of good software engineering practices. 

For complex types I would agree, but atomic_t is assumed to be just
another int - just with special ops. For such things we can hold that
memset('0') will properly initialize them to their 0 value.

>  I 
> hadn't realized you were so passionate about avoiding initialization of 
> global atomic_t variables, 

Given that static/global storage is properly initialized to 0, and the
above, it seems to be redundant.

> I assume you wouldn't object to removing all such cases in the kernel.
> 
>         $ grep -r "atomic_t.*= ATOMIC_INIT(0)" * | wc -l
>         104

Only IFF all those cases are for static/global storage. Otherwise you
have to ensure 0-ness by either using __GFP_ZERO or explicit
initialization.

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