2012-10-31 11:23:02

by Shan Wei

Subject: [PATCH 6/9] kernel: padata : use this_cpu_ptr per-cpu helper

From: Shan Wei <[email protected]>


Signed-off-by: Shan Wei <[email protected]>
---
kernel/padata.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/padata.c b/kernel/padata.c
index 89fe3d1..70dffe8 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -204,7 +204,7 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
goto out;
}

- queue = per_cpu_ptr(pd->pqueue, smp_processor_id());
+ queue = this_cpu_ptr(pd->pqueue);
if (queue->cpu_index == next_queue->cpu_index) {
padata = ERR_PTR(-ENODATA);
goto out;
--
1.7.1

2012-10-31 17:45:48

by Christoph Lameter (Ampere)

Subject: Re: [PATCH 6/9] kernel: padata : use this_cpu_ptr per-cpu helper

On Wed, 31 Oct 2012, Shan Wei wrote:

> From: Shan Wei <[email protected]>
>
>
> Signed-off-by: Shan Wei <[email protected]>
> ---
> kernel/padata.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/padata.c b/kernel/padata.c
> index 89fe3d1..70dffe8 100644
> --- a/kernel/padata.c
> +++ b/kernel/padata.c
> @@ -204,7 +204,7 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
> goto out;
> }
>
> - queue = per_cpu_ptr(pd->pqueue, smp_processor_id());
> + queue = this_cpu_ptr(pd->pqueue);
> if (queue->cpu_index == next_queue->cpu_index) {

Its simpler to just remove the per_cpu op completely and change the if
statement to

if (this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index))
{

..