From 0323155437870dbbae6e30fb659d7514c9f649da Mon Sep 17 00:00:00 2001
From: Chi Wu <wuchi.zero@gmail.com>
Date: Mon, 28 Jun 2021 19:35:34 -0700
Subject: [PATCH] mm/page-writeback: update the comment of Dirty position
 control

As the value of pos_ratio_polynom() clamp between 0 and 2LL <<
RATELIMIT_CALC_SHIFT, the global control line should be consistent with
it.

Link: https://lkml.kernel.org/r/20210511103606.3732-1-wuchi.zero@gmail.com
Signed-off-by: Chi Wu <wuchi.zero@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@fb.com>
Cc: Howard Cochran <hcochran@kernelspring.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/page-writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index aff3205dfde5..d0f090d682f5 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -845,7 +845,7 @@ static long long pos_ratio_polynom(unsigned long setpoint,
  *     ^ pos_ratio
  *     |
  *     |            |<===== global dirty control scope ======>|
- * 2.0 .............*
+ * 2.0  * * * * * * *
  *     |            .*
  *     |            . *
  *     |            .   *