[PATCH RT 6/7] fs/dcache: incremental fixup of the retry routine

From	Steven Rostedt <rostedt@goodmis.org>
Newsgroups	linux.kernel
Subject	[PATCH RT 6/7] fs/dcache: incremental fixup of the retry routine
Date	2016-09-23 18:50 +0200
Message-ID	<skBPI-6j6-19@gated-at.bofh.it> (permalink)
References	<skBPH-6j6-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.4.112-rt144-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

It has been pointed out by tglx that on UP the non-RT task could spin
its entire time slice because the lock owner is preempted. This won't
happen on !RT. So we back to "chill" if we can't cond_resched() did not
work.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 fs/dcache.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 408551d483b7..e0a439c13318 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -38,8 +38,6 @@
 #include <linux/prefetch.h>
 #include <linux/ratelimit.h>
 #include <linux/delay.h>
-#include <linux/sched/rt.h>
-#include <linux/sched/deadline.h>
 #include "internal.h"
 #include "mount.h"
 
@@ -575,10 +573,11 @@ kill_it:
 		if (parent == dentry) {
 			/* the task with the highest priority won't schedule */
 			r = cond_resched();
-			if (!r && (rt_task(current) || dl_task(current)))
+			if (!r)
 				cpu_chill();
-		} else
+		} else {
 			dentry = parent;
+		}
 		goto repeat;
 	}
 }
-- 
2.8.1

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[PATCH RT 6/7] fs/dcache: incremental fixup of the retry routine Steven Rostedt <rostedt@goodmis.org> - 2016-09-23 18:50 +0200

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