LKML Archive on
 help / color / Atom feed
From: Miroslav Benes <>
Cc:,,, Miroslav Benes <>
Subject: [PATCH] ring-buffer: Remove unused function ring_buffer_page_len()
Date: Fri, 28 Dec 2018 14:38:47 +0100
Message-ID: <> (raw)

Commit 6b7e633fe9c2 ("tracing: Remove extra zeroing out of the ring
buffer page") removed the only caller of ring_buffer_page_len(). The
function is now unused and may be removed.

Signed-off-by: Miroslav Benes <>
I am sorry if you received the patch more than once (hopefully not). For some
strange reasons git send-email segfaulted, I tried to send from a different
machine and made a mistake. Holiday mode *sigh*.

 include/linux/ring_buffer.h |  3 ---
 kernel/trace/ring_buffer.c  | 14 --------------
 2 files changed, 17 deletions(-)

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index 0940fda59872..2351aa46dbc7 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -187,9 +187,6 @@ void ring_buffer_set_clock(struct ring_buffer *buffer,
 void ring_buffer_set_time_stamp_abs(struct ring_buffer *buffer, bool abs);
 bool ring_buffer_time_stamp_abs(struct ring_buffer *buffer);
-size_t ring_buffer_page_len(void *page);
 void *ring_buffer_alloc_read_page(struct ring_buffer *buffer, int cpu);
 void ring_buffer_free_read_page(struct ring_buffer *buffer, int cpu, void *data);
 int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page,
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 4f3247a53259..ca1308eec4a4 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -353,20 +353,6 @@ static void rb_init_page(struct buffer_data_page *bpage)
 	local_set(&bpage->commit, 0);
- * ring_buffer_page_len - the size of data on the page.
- * @page: The page to read
- *
- * Returns the amount of data on the page, including buffer page header.
- */
-size_t ring_buffer_page_len(void *page)
-	struct buffer_data_page *bpage = page;
-	return (local_read(&bpage->commit) & ~RB_MISSED_FLAGS)
  * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
  * this issue out.

             reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-28 13:38 Miroslav Benes [this message]
2018-12-28 23:33 ` Steven Rostedt
2019-02-06 16:24   ` Miroslav Benes
2019-02-06 16:54     ` Steven Rostedt
2019-02-06 16:59       ` Steven Rostedt

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git
	git clone --mirror lkml/git/8.git
	git clone --mirror lkml/git/9.git
	git clone --mirror lkml/git/10.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone