linux-kernel - [PATCH 2/2] docs/mm: Specify page frag size is not bigger than PAGE

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Message-Id: <1743715309-318-3-git-send-email-haiyangz@microsoft.com>
Date: Thu,  3 Apr 2025 14:21:49 -0700
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: linux-hyperv@...r.kernel.org,
	akpm@...ux-foundation.org,
	corbet@....net,
	linux-mm@...ck.org,
	linux-doc@...r.kernel.org
Cc: haiyangz@...rosoft.com,
	decui@...rosoft.com,
	kys@...rosoft.com,
	paulros@...rosoft.com,
	olaf@...fle.de,
	vkuznets@...hat.com,
	davem@...emloft.net,
	wei.liu@...nel.org,
	longli@...rosoft.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] docs/mm: Specify page frag size is not bigger than PAGE_SIZE

The page frag allocator is not designed for fragsz > PAGE_SIZE.
Specify this in the document.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 Documentation/mm/page_frags.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/mm/page_frags.rst b/Documentation/mm/page_frags.rst
index 503ca6cdb804..212ecc69dd74 100644
--- a/Documentation/mm/page_frags.rst
+++ b/Documentation/mm/page_frags.rst
@@ -2,7 +2,7 @@
 Page fragments
 ==============
 
-A page fragment is an arbitrary-length arbitrary-offset area of memory
+A page fragment is a len <= PAGE_SIZE, arbitrary-offset area of memory
 which resides within a 0 or higher order compound page.  Multiple
 fragments within that page are individually refcounted, in the page's
 reference counter.
-- 
2.34.1