This is a note to let you know that I've just added the patch titled
ftrace: Optimize the allocation for mcount entries
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ftrace-optimize-the-allocation-for-mcount-entries.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bcea02b096333dc74af987cb9685a4dbdd820840 Mon Sep 17 00:00:00 2001
From: Wang Wensheng <wangwensheng4@xxxxxxxxxx>
Date: Wed, 9 Nov 2022 09:44:33 +0000
Subject: ftrace: Optimize the allocation for mcount entries
From: Wang Wensheng <wangwensheng4@xxxxxxxxxx>
commit bcea02b096333dc74af987cb9685a4dbdd820840 upstream.
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@xxxxxxxxxx
Cc: <mhiramat@xxxxxxxxxx>
Cc: <mark.rutland@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: a79008755497d ("ftrace: Allocate the mcount record pages as groups")
Signed-off-by: Wang Wensheng <wangwensheng4@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/ftrace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3013,7 +3013,7 @@ static int ftrace_allocate_records(struc
/* if we can't allocate this size, try something smaller */
if (!order)
return -ENOMEM;
- order >>= 1;
+ order--;
goto again;
}
Patches currently in stable-queue which might be from wangwensheng4@xxxxxxxxxx are
queue-4.9/ftrace-optimize-the-allocation-for-mcount-entries.patch
queue-4.9/ftrace-fix-the-possible-incorrect-kernel-message.patch
