cpuset: fix regression when failed to generate sched domains

commit 700018e0a77b4113172257fcdaa1c58e27a5074f upstream.

Impact: properly rebuild sched-domains on kmalloc() failure

When cpuset failed to generate sched domains due to kmalloc()
failure, the scheduler should fallback to the single partition
'fallback_doms' and rebuild sched domains, but now it only
destroys but not rebuilds sched domains.

The regression was introduced by:

| commit dfb512ec4834116124da61d6c1ee10fd0aa32bd6
| Author: Max Krasnyansky <maxk@qualcomm.com>
| Date:   Fri Aug 29 13:11:41 2008 -0700
|
|    sched: arch_reinit_sched_domains() must destroy domains to force rebuild

After the above commit, partition_sched_domains(0, NULL, NULL) will
only destroy sched domains and partition_sched_domains(1, NULL, NULL)
will create the default sched domain.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 827cd9adccb272f3d54a0ea8a98ba8c028cde211..fbda85dddb2145330fc7c8cf8d8e1a254db58cc3 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -587,7 +587,6 @@ static int generate_sched_domains(cpumask_t **domains,
        int ndoms;              /* number of sched domains in result */
        int nslot;              /* next empty doms[] cpumask_t slot */
 
-       ndoms = 0;
        doms = NULL;
        dattr = NULL;
        csa = NULL;
@@ -674,10 +673,8 @@ restart:
         * Convert <csn, csa> to <ndoms, doms> and populate cpu masks.
         */
        doms = kmalloc(ndoms * sizeof(cpumask_t), GFP_KERNEL);
-       if (!doms) {
-               ndoms = 0;
+       if (!doms)
                goto done;
-       }
 
        /*
         * The rest of the code, including the scheduler, can deal with
@@ -732,6 +729,13 @@ restart:
 done:
        kfree(csa);
 
+       /*
+        * Fallback to the default domain if kmalloc() failed.
+        * See comments in partition_sched_domains().
+        */
+       if (doms == NULL)
+               ndoms = 1;
+
        *domains    = doms;
        *attributes = dattr;
        return ndoms;

diff --git a/kernel/sched.c b/kernel/sched.c
index ad1962dc0aa20cb865675e8e08e49f5b49bce1df..a992cbe01c73beef229fc19ee86313390d4c7f30 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7692,13 +7692,14 @@ static int dattrs_equal(struct sched_domain_attr *cur, int idx_cur,
  *
  * The passed in 'doms_new' should be kmalloc'd. This routine takes
  * ownership of it and will kfree it when done with it. If the caller
- * failed the kmalloc call, then it can pass in doms_new == NULL,
- * and partition_sched_domains() will fallback to the single partition
- * 'fallback_doms', it also forces the domains to be rebuilt.
+ * failed the kmalloc call, then it can pass in doms_new == NULL &&
+ * ndoms_new == 1, and partition_sched_domains() will fallback to
+ * the single partition 'fallback_doms', it also forces the domains
+ * to be rebuilt.
  *
- * If doms_new==NULL it will be replaced with cpu_online_map.
- * ndoms_new==0 is a special case for destroying existing domains.
- * It will not create the default domain.
+ * If doms_new == NULL it will be replaced with cpu_online_map.
+ * ndoms_new == 0 is a special case for destroying existing domains,
+ * and it will not create the default domain.
  *
  * Call with hotplug lock held
  */