From 0740e54304dcd11cf2a8edb6764423eb2fed1c61 Mon Sep 17 00:00:00 2001
From: Yafang Shao <laoar.shao@gmail.com>
Date: Wed, 13 Nov 2024 23:07:11 +0800
Subject: [PATCH] mm, doc: update read_ahead_kb for MADV_HUGEPAGE

MADV_HUGEPAGE is a new addition to readahead with behavior distinct from
normal pages.  To prevent confusion, we should update the documentation
accordingly.

Link: https://lkml.kernel.org/r/20241113150711.1685-1-laoar.shao@gmail.com
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 Documentation/ABI/stable/sysfs-block | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index cea8856f798dd..7a820a7d53aab 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -594,6 +594,9 @@ Description:
 		[RW] Maximum number of kilobytes to read-ahead for filesystems
 		on this block device.
 
+		For MADV_HUGEPAGE, the readahead size may exceed this setting
+		since its granularity is based on the hugepage size.
+
 
 What:		/sys/block/<disk>/queue/rotational
 Date:		January 2009
-- 
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