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Date:	Fri, 19 Sep 2014 19:35:09 -0400
From:	Pranith Kumar <>
To:	Josh Triplett <>
Cc:	"Paul E. McKenney" <>,
	Steven Rostedt <>,
	Mathieu Desnoyers <>,
	Lai Jiangshan <>,
	"open list:READ-COPY UPDATE..." <>
Subject: Re: [RFC PATCH] rcu: Change use of __this_cpu ops on a bool type

On Fri, Sep 19, 2014 at 4:57 PM, Josh Triplett <> wrote:
> On Fri, Sep 19, 2014 at 01:26:03PM -0400, Pranith Kumar wrote:
>> __this_cpu_{read/write}() uses sizeof() to determine the size of the variable.
>> Using this operation on a bool type causes sparse to complain.
>> I checked the generated code and there is only a slight difference in
>> instructions generated.
>> I am not sure this warning by sparse is really valid, but let us silence it
>> anyways.
>> Signed-off-by: Pranith Kumar <>
> I believe this warning was actually fixed with current versions of
> Sparse; there was some discussion and a patch on the linux-sparse
> mailing list.  Can you please recheck with the latest Sparse from git,
> and if it still breaks, please raise that on linux-sparse?

Yup, looks like the latest version of sparse fixes this. Please ignore
this patch. Thanks!

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