linux-kernel - Re: [PATCH tip/core/rcu 31/55] rcu: Make rcu_implicit_dynticks

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Message-ID: <20111024120032.GB2273@linux.vnet.ibm.com>
Date:	Mon, 24 Oct 2011 05:00:32 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 31/55] rcu: Make
 rcu_implicit_dynticks_qs() locals be correct size

On Sun, Oct 16, 2011 at 06:43:50PM -0700, Josh Triplett wrote:
> On Tue, Sep 06, 2011 at 11:00:25AM -0700, Paul E. McKenney wrote:
> > When the ->dynticks field in the rcu_dynticks structure changed to an
> > atomic_t, its size on 64-bit systems changed from 64 bits to 32 bits.
> > The local variables in rcu_implicit_dynticks_qs() need to change as
> > well, hence this commit.
> 
> If an atomic_t always holds 32-bits, which it appears to, then shouldn't
> this use u32 rather than unsigned int?

The atomic_t definition is "int", and I need "unsigned int" to avoid
integer overflow.

But it might make sense to make atomic_t s32, in which case I would
use u32.  I don't feel very strongly about it either way, because "int"
is also defined to be 32 bits.  Maybe I should put such a patch forward
later on.

							Thanx, Paul

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