[PATCH] cpuset: allow a larger buffer for writes to cpuset files
authorPaul Menage <menage@google.com>
Thu, 7 Dec 2006 04:41:37 +0000 (20:41 -0800)
committerLinus Torvalds <torvalds@woody.osdl.org>
Thu, 7 Dec 2006 16:39:48 +0000 (08:39 -0800)
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.

Signed-off-by: Paul Menage <menage@google.com>
Acked-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/cpuset.c

index 4ef1d29297ca13bcd9919da0752f9375233f4f27..0a6b4d89f9a031c5e394fb1487530e9ce7dc806b 100644 (file)
@@ -1280,7 +1280,8 @@ typedef enum {
        FILE_TASKLIST,
 } cpuset_filetype_t;
 
-static ssize_t cpuset_common_file_write(struct file *file, const char __user *userbuf,
+static ssize_t cpuset_common_file_write(struct file *file,
+                                       const char __user *userbuf,
                                        size_t nbytes, loff_t *unused_ppos)
 {
        struct cpuset *cs = __d_cs(file->f_dentry->d_parent);
@@ -1291,7 +1292,7 @@ static ssize_t cpuset_common_file_write(struct file *file, const char __user *us
        int retval = 0;
 
        /* Crude upper limit on largest legitimate cpulist user might write. */
-       if (nbytes > 100 + 6 * NR_CPUS)
+       if (nbytes > 100 + 6 * max(NR_CPUS, MAX_NUMNODES))
                return -E2BIG;
 
        /* +1 for nul-terminator */