tree 693ac9cdb0693acb0f935d4b61a34e6a12056add
parent ca2f3daf779f5e89d14e9783fcfd7920842df9e9
author Paul Jackson <[EMAIL PROTECTED]> Fri, 26 Aug 2005 02:47:56 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Sat, 27 Aug 2005 06:38:47 -0700

[PATCH] completely disable cpu_exclusive sched domain

At the suggestion of Nick Piggin and Dinakar, totally disable
the facility to allow cpu_exclusive cpusets to define dynamic
sched domains in Linux 2.6.13, in order to avoid problems
first reported by John Hawkes (corrupt sched data structures
and kernel oops).

This has been built for ppc64, i386, ia64, x86_64, sparc, alpha.
It has been built, booted and tested for cpuset functionality
on an SN2 (ia64).

Dinakar or Nick - could you verify that it for sure does avoid
the problems Hawkes reported.  Hawkes is out of town, and I don't
have the recipe to reproduce what he found.

Signed-off-by: Paul Jackson <[EMAIL PROTECTED]>
Acked-by: Nick Piggin <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 kernel/cpuset.c |   13 +++++++++++++
 1 files changed, 13 insertions(+)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -627,6 +627,14 @@ static int validate_change(const struct 
  * Call with cpuset_sem held.  May nest a call to the
  * lock_cpu_hotplug()/unlock_cpu_hotplug() pair.
  */
+
+/*
+ * Hack to avoid 2.6.13 partial node dynamic sched domain bug.
+ * Disable letting 'cpu_exclusive' cpusets define dynamic sched
+ * domains, until the sched domain can handle partial nodes.
+ * Remove this #if hackery when sched domains fixed.
+ */
+#if 0
 static void update_cpu_domains(struct cpuset *cur)
 {
        struct cpuset *c, *par = cur->parent;
@@ -667,6 +675,11 @@ static void update_cpu_domains(struct cp
        partition_sched_domains(&pspan, &cspan);
        unlock_cpu_hotplug();
 }
+#else
+static void update_cpu_domains(struct cpuset *cur)
+{
+}
+#endif
 
 static int update_cpumask(struct cpuset *cs, char *buf)
 {
-
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