[PATCH linux-next] ring_buffer: remove redundant ret variables

[PATCH linux-next] ring_buffer: remove redundant ret variables

[zhang.songyi]

From: zhang songyi <zhang.songyi@zte.com.cn>

Return values from ring_buffer_bytes_cpu(), ring_buffer_overrun_cpu(),
ring_buffer_commit_overrun_cpu(), ring_buffer_dropped_events_cpu()
directly instead of taking this in another redundant variable.

Signed-off-by: zhang songyi <zhang.songyi@zte.com.cn>
---
 kernel/trace/ring_buffer.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 843818ee4814..353c90ce7640 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4224,15 +4224,13 @@ EXPORT_SYMBOL_GPL(ring_buffer_oldest_event_ts);
 unsigned long ring_buffer_bytes_cpu(struct trace_buffer *buffer, int cpu)
 {
        struct ring_buffer_per_cpu *cpu_buffer;
-       unsigned long ret;

        if (!cpumask_test_cpu(cpu, buffer->cpumask))
                return 0;

        cpu_buffer = buffer->buffers[cpu];
-       ret = local_read(&cpu_buffer->entries_bytes) - cpu_buffer->read_bytes;

-       return ret;
+       return local_read(&cpu_buffer->entries_bytes) - cpu_buffer->read_bytes;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_bytes_cpu);

@@ -4263,15 +4261,13 @@ EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
 unsigned long ring_buffer_overrun_cpu(struct trace_buffer *buffer, int cpu)
 {
        struct ring_buffer_per_cpu *cpu_buffer;
-       unsigned long ret;

        if (!cpumask_test_cpu(cpu, buffer->cpumask))
                return 0;

        cpu_buffer = buffer->buffers[cpu];
-       ret = local_read(&cpu_buffer->overrun);

-       return ret;
+       return local_read(&cpu_buffer->overrun);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);

@@ -4286,15 +4282,13 @@ unsigned long
 ring_buffer_commit_overrun_cpu(struct trace_buffer *buffer, int cpu)
 {
        struct ring_buffer_per_cpu *cpu_buffer;
-       unsigned long ret;

        if (!cpumask_test_cpu(cpu, buffer->cpumask))
                return 0;

        cpu_buffer = buffer->buffers[cpu];
-       ret = local_read(&cpu_buffer->commit_overrun);

-       return ret;
+       return local_read(&cpu_buffer->commit_overrun);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_commit_overrun_cpu);

@@ -4308,15 +4302,13 @@ unsigned long
 ring_buffer_dropped_events_cpu(struct trace_buffer *buffer, int cpu)
 {
        struct ring_buffer_per_cpu *cpu_buffer;
-       unsigned long ret;

        if (!cpumask_test_cpu(cpu, buffer->cpumask))
                return 0;

        cpu_buffer = buffer->buffers[cpu];
-       ret = local_read(&cpu_buffer->dropped_events);

-       return ret;
+       return local_read(&cpu_buffer->dropped_events);
 }
 EXPORT_SYMBOL_GPL(ring_buffer_dropped_events_cpu);

--
2.15.2

Re: [PATCH linux-next] ring_buffer: remove redundant ret variables

[Steven Rostedt]

On Mon, 28 Nov 2022 21:10:00 +0800 (CST)
<zhang.songyi@zte.com.cn> wrote:

> From: zhang songyi <zhang.songyi@zte.com.cn>
> 
> Return values from ring_buffer_bytes_cpu(), ring_buffer_overrun_cpu(),
> ring_buffer_commit_overrun_cpu(), ring_buffer_dropped_events_cpu()
> directly instead of taking this in another redundant variable.
> 
> Signed-off-by: zhang songyi <zhang.songyi@zte.com.cn>
> ---

Fine, I may add this, as it looks like leftovers from 8aabee573dff
("ring-buffer: remove unneeded get_online_cpus"). But they make no real
difference staying as is.

-- Steve