linux-kernel - [for-linus][PATCH 7/8] ring-buffer: remove obsolete comment for free_buffer

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Date:   Sun, 19 Mar 2023 12:46:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...e.hu>,
        Mike Rapoport <mike.rapoport@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mukesh Ojha <quic_mojha@...cinc.com>
Subject: [for-linus][PATCH 7/8] ring-buffer: remove obsolete comment for free_buffer_page()

From: Vlastimil Babka <vbabka@...e.cz>

The comment refers to mm/slob.c which is being removed. It comes from
commit ed56829cb319 ("ring_buffer: reset buffer page when freeing") and
according to Steven the borrowed code was a page mapcount and mapping
reset, which was later removed by commit e4c2ce82ca27 ("ring_buffer:
allocate buffer page pointer"). Thus the comment is not accurate anyway,
remove it.

Link: https://lore.kernel.org/linux-trace-kernel/20230315142446.27040-1-vbabka@suse.cz

Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Ingo Molnar <mingo@...e.hu>
Reported-by: Mike Rapoport <mike.rapoport@...il.com>
Suggested-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Fixes: e4c2ce82ca27 ("ring_buffer: allocate buffer page pointer")
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/ring_buffer.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 071184324d18..3c7cd135333f 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -354,10 +354,6 @@ static void rb_init_page(struct buffer_data_page *bpage)
 	local_set(&bpage->commit, 0);
 }
 
-/*
- * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
- * this issue out.
- */
 static void free_buffer_page(struct buffer_page *bpage)
 {
 	free_page((unsigned long)bpage->page);
-- 
2.39.1