The patch titled
cpuset: allow a larger buffer for writes to cpuset files
has been added to the -mm tree. Its filename is
cpuset-allow-a-larger-buffer-for-writes-to-cpuset-files.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cpuset: allow a larger buffer for writes to cpuset files
From: "Paul Menage" <menage@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/cpuset.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff -puN kernel/cpuset.c~cpuset-allow-a-larger-buffer-for-writes-to-cpuset-files kernel/cpuset.c
--- a/kernel/cpuset.c~cpuset-allow-a-larger-buffer-for-writes-to-cpuset-files
+++ a/kernel/cpuset.c
@@ -1218,7 +1218,8 @@ 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);
@@ -1229,7 +1230,7 @@ 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 > 100 + 6 * max(NR_CPUS, MAX_NUMNODES))
return -E2BIG;
/* +1 for nul-terminator */
_
Patches currently in -mm which might be from menage@xxxxxxxxxx are
add-noaliencache-boot-option-to-disable-numa-alien-caches.patch
cpuset-allow-a-larger-buffer-for-writes-to-cpuset-files.patch
-
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