Re: percpu: Define this_cpu_cpumask_var_t_ptr

From: Tejun Heo
Date: Thu Aug 28 2014 - 09:02:21 EST


On Tue, Aug 26, 2014 at 07:12:21PM -0500, Christoph Lameter wrote:
> New patch:
> From: Christoph Lameter <cl@xxxxxxxxx>
> Subject: __get_cpu_var/cpumask_var_t: Resolve ambiguities v2
> __get_cpu_var can paper over differences in the definitions
> of cpumask_var_t and either use the address of the cpumask
> variable directly or perform a fetch of the address of the
> struct cpumask allocated elsewhere. This is important
> particularly when using per cpu cpumask_var_t declarations
> because in one case we have an offset into a per cpu area
> to handle and in the other case we need to fetch a pointer
> from the offset.
> This patch introduces a new macro
> this_cpu_cpumask_var_t_ptr()
> that is defined where cpumask_var_t is defined and performs
> the proper actions. All use cases where __get_cpu_var
> is used with cpumask_var_t are converted to the use
> of this_cpu_cpumask_var_t_ptr().
> Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>

Rusty, if this looks okay to you, I'll route this through
percpu/for-3.18-consistent-ops branch.


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