linux-kernel - [PATCH] ring-buffer: remove obsolete rb_event_is

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Message-Id: <20201117053703.11275-1-lukas.bulwahn@gmail.com>
Date:   Tue, 17 Nov 2020 06:37:03 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Tom Rix <trix@...hat.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] ring-buffer: remove obsolete rb_event_is_commit()

Commit a389d86f7fd0 ("ring-buffer: Have nested events still record running
time stamp") removed the only uses of rb_event_is_commit() in
rb_update_event() and rb_update_write_stamp().

Hence, since then, make CC=clang W=1 warns:

  kernel/trace/ring_buffer.c:2763:1:
    warning: unused function 'rb_event_is_commit' [-Wunused-function]

Remove this obsolete function.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
applies cleanly on current master and next-20201116

Steven, please pick this minor non-urgent clean-up patch.

 kernel/trace/ring_buffer.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index ab68f28b8f4b..799d790ab365 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2629,9 +2629,6 @@ rb_add_time_stamp(struct ring_buffer_event *event, u64 delta, bool abs)
 	return skip_time_extend(event);
 }
 
-static inline bool rb_event_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
-				     struct ring_buffer_event *event);
-
 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
 static inline bool sched_clock_stable(void)
 {
@@ -2759,20 +2756,6 @@ static unsigned rb_calculate_event_length(unsigned length)
 	return length;
 }
 
-static __always_inline bool
-rb_event_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
-		   struct ring_buffer_event *event)
-{
-	unsigned long addr = (unsigned long)event;
-	unsigned long index;
-
-	index = rb_event_index(event);
-	addr &= PAGE_MASK;
-
-	return cpu_buffer->commit_page->page == (void *)addr &&
-		rb_commit_index(cpu_buffer) == index;
-}
-
 static u64 rb_time_delta(struct ring_buffer_event *event)
 {
 	switch (event->type_len) {
-- 
2.17.1