36 lines
1012 B
Diff
36 lines
1012 B
Diff
Subject: fs: namespace: Use cpu_chill() instead of cpu_relax()
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 07 Mar 2012 21:05:19 +0100
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Retry loops on RT might loop forever when the modifying side was
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preempted. Use cpu_chill() instead of cpu_relax() to let the system
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make progress.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: stable-rt@vger.kernel.org
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---
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fs/namespace.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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Index: linux-3.2/fs/namespace.c
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===================================================================
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--- linux-3.2.orig/fs/namespace.c
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+++ linux-3.2/fs/namespace.c
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@@ -31,6 +31,7 @@
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#include <linux/idr.h>
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#include <linux/fs_struct.h>
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#include <linux/fsnotify.h>
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+#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include "pnode.h"
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@@ -346,7 +347,7 @@ int mnt_want_write(struct vfsmount *mnt)
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*/
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while (mnt->mnt_flags & MNT_WRITE_HOLD) {
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preempt_enable();
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- cpu_relax();
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+ cpu_chill();
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preempt_disable();
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}
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/*
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