linux-kernel - [for-linus][PATCH 06/13] ftrace: Optimize the allocation for mcount entries

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Date:   Sun, 20 Nov 2022 15:07:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <mark.rutland@....com>, stable@...r.kernel.org,
        Wang Wensheng <wangwensheng4@...wei.com>
Subject: [for-linus][PATCH 06/13] ftrace: Optimize the allocation for mcount entries

From: Wang Wensheng <wangwensheng4@...wei.com>

If we can't allocate this size, try something smaller with half of the
size. Its order should be decreased by one instead of divided by two.

Link: https://lkml.kernel.org/r/20221109094434.84046-3-wangwensheng4@huawei.com

Cc: <mhiramat@...nel.org>
Cc: <mark.rutland@....com>
Cc: stable@...r.kernel.org
Fixes: a79008755497d ("ftrace: Allocate the mcount record pages as groups")
Signed-off-by: Wang Wensheng <wangwensheng4@...wei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 8b13ce2eae70..56a168121bfc 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3190,7 +3190,7 @@ static int ftrace_allocate_records(struct ftrace_page *pg, int count)
 		/* if we can't allocate this size, try something smaller */
 		if (!order)
 			return -ENOMEM;
-		order >>= 1;
+		order--;
 		goto again;
 	}
 
-- 
2.35.1