On Wed, 31 Oct 2012, Shan Wei wrote:
> From: Shan Wei <davids...@tencent.com>
>
>
> Signed-off-by: Shan Wei <davids...@tencent.com>
> ---
> kernel/trace/blktrace.c | 2 +-
> kernel/trace/trace.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
> index c0bd030..71259e2 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -147,7 +147,7 @@ void __trace_note_message(struct blk_trace *bt, const
> char *fmt, ...)
> return;
>
> local_irq_save(flags);
> - buf = per_cpu_ptr(bt->msg_data, smp_processor_id());
> + buf = this_cpu_ptr(bt->msg_data);
> va_start(args, fmt);
> n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
> va_end(args);
Ok
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 31e4f55..81ae35b 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -1513,7 +1513,7 @@ static char *get_trace_buf(void)
> if (!percpu_buffer)
> return NULL;
>
> - buffer = per_cpu_ptr(percpu_buffer, smp_processor_id());
> + buffer = this_cpu_ptr(percpu_buffer);
>
> return buffer->buffer;
Just do a
return this_cpu_read(percpu_buffer->buffer);
and get rid of the this_cpu_ptr op
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