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ring-buffer: Remove unused function ring_buffer_page_len()

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Commit 6b7e633fe9 ("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.

Link: http://lkml.kernel.org/r/20181228133847.106177-1-mbenes@suse.cz

Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Miroslav Benes 2018-12-28 14:38:47 +01:00 committed by Steven Rostedt (VMware)
parent f52d569f3d
commit d325c40296
2 changed files with 0 additions and 16 deletions
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2
include/linux/ring_buffer.h
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@ -187,8 +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);
size_t ring_buffer_nr_pages(struct ring_buffer *buffer, int cpu);
size_t ring_buffer_nr_dirty_pages(struct ring_buffer *buffer, int cpu);

14
kernel/trace/ring_buffer.c
View File

@ -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)
+ BUF_PAGE_HDR_SIZE;
}
/*
* Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
* this issue out.