tracing: Use this_cpu_ptr per-cpu helper

typeof(&buffer) is a pointer to array of 1024 char, or char (*)[1024].
But, typeof(&buffer[0]) is a pointer to char which match the return type of get_trace_buf().
As well-known, the value of &buffer is equal to &buffer[0].
so return this_cpu_ptr(&percpu_buffer->buffer[0]) can avoid type cast.

Link: http://lkml.kernel.org/r/50A1A800.3020102@gmail.com
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index c0bd030..71259e2 100644 (file)
--- 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);

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3c13e46..f8b7c62 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1517,7 +1517,6 @@ static struct trace_buffer_struct *trace_percpu_nmi_buffer;
 static char *get_trace_buf(void)
 {
        struct trace_buffer_struct *percpu_buffer;
-       struct trace_buffer_struct *buffer;
 
        /*
         * If we have allocated per cpu buffers, then we do not
@@ -1535,9 +1534,7 @@ static char *get_trace_buf(void)
        if (!percpu_buffer)
                return NULL;
 
-       buffer = per_cpu_ptr(percpu_buffer, smp_processor_id());
-
-       return buffer->buffer;
+       return this_cpu_ptr(&percpu_buffer->buffer[0]);
 }
 
 static int alloc_percpu_trace_buffer(void)