linux-kernel - [PATCH] Allow a larger buffer for writes to cpuset files

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Message-ID: <6599ad830610301838i65a00d85g82647435ea4581a4@mail.gmail.com>
Date:	Mon, 30 Oct 2006 18:38:41 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Andrew Morton" <akpm@...l.org>, "Paul Jackson" <pj@....com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] Allow a larger buffer for writes to cpuset files

When using fake NUMA setup, the number of memory nodes can greatly
exceed the number of CPUs. So the current limit in
cpuset_common_file_write() is insufficient. PAGE_SIZE is still a bit
of an arbitrary limit, but gives more breathing room.

Signed-off-by: Paul Menage <menage@...gle.com>

--- 2.6.19-rc2.orig/kernel/cpuset.c
+++ 2.6.19-rc2/kernel/cpuset.c
@@ -1292,7 +1292,7 @@ static ssize_t cpuset_common_file_write(
 	int retval = 0;

 	/* Crude upper limit on largest legitimate cpulist user might write. */
-	if (nbytes > 100 + 6 * NR_CPUS)
+	if (nbytes >= PAGE_SIZE)
 		return -E2BIG;

 	/* +1 for nul-terminator */
-
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