X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fpdflush.c;h=52822c98c489c36bc30e24871eef936766b5c784;hb=c7e9dd4dd0b8dd75c410011b3c8f9980112fd0f8;hp=d6781951267eb654a522529658aaa06199d1772f;hpb=3e0777b8fa96f7073ed5d13d3bc1d573b766bef9;p=linux-2.6-omap-h63xx.git

diff --git a/mm/pdflush.c b/mm/pdflush.c
index d6781951267..52822c98c48 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -20,6 +20,7 @@
 #include <linux/fs.h>		// Needed by writeback.h
 #include <linux/writeback.h>	// Prototypes pdflush_operation()
 #include <linux/kthread.h>
+#include <linux/cpuset.h>
 
 
 /*
@@ -170,12 +171,24 @@ static int __pdflush(struct pdflush_work *my_work)
 static int pdflush(void *dummy)
 {
 	struct pdflush_work my_work;
+	cpumask_t cpus_allowed;
 
 	/*
 	 * pdflush can spend a lot of time doing encryption via dm-crypt.  We
 	 * don't want to do that at keventd's priority.
 	 */
 	set_user_nice(current, 0);
+
+	/*
+	 * Some configs put our parent kthread in a limited cpuset,
+	 * which kthread() overrides, forcing cpus_allowed == CPU_MASK_ALL.
+	 * Our needs are more modest - cut back to our cpusets cpus_allowed.
+	 * This is needed as pdflush's are dynamically created and destroyed.
+	 * The boottime pdflush's are easily placed w/o these 2 lines.
+	 */
+	cpus_allowed = cpuset_cpus_allowed(current);
+	set_cpus_allowed(current, cpus_allowed);
+
 	return __pdflush(&my_work);
 }