linux-kernel - [PATCH v4.19.y] fs: sysfs_emit: Remove PAGE

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Message-ID: <YjWewxFJ1TmT+wFy@kroah.com>
Date:   Sat, 19 Mar 2022 10:13:39 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     stable@...r.kernel.org
Cc:     Lucas Wei <lucaswei@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v4.19.y] fs: sysfs_emit: Remove PAGE_SIZE alignment check

From: Lucas Wei <lucaswei@...gle.com>

For kernel releases older than 4.20, using the SLUB alloctor will cause
this alignment check to fail as that allocator did NOT align kmalloc
allocations on a PAGE_SIZE boundry.

Remove the check for these older kernels as it is a false-positive and
causes problems on many devices.

Signed-off-by: Lucas Wei <lucaswei@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -567,8 +567,7 @@
 	va_list args;
 	int len;
 
-	if (WARN(!buf || offset_in_page(buf),
-		 "invalid sysfs_emit: buf:%p\n", buf))
+	if (WARN(!buf, "invalid sysfs_emit: buf:%p\n", buf))
 		return 0;
 
 	va_start(args, fmt);