From a17deff6a99920caeaf97627463813984bc5dd22 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 08:44:34 -0500
Subject: mm: scatterlist dont disable irqs on RT

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index d16fa29..9c1236e 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -582,7 +582,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
 			flush_kernel_dcache_page(miter->page);
 
 		if (miter->__flags & SG_MITER_ATOMIC) {
-			WARN_ON_ONCE(preemptible());
+			WARN_ON_ONCE(!pagefault_disabled());
 			kunmap_atomic(miter->addr);
 		} else
 			kunmap(miter->page);
@@ -627,7 +627,7 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
 	if (!sg_miter_skip(&miter, skip))
 		return false;
 
-	local_irq_save(flags);
+	local_irq_save_nort(flags);
 
 	while (sg_miter_next(&miter) && offset < buflen) {
 		unsigned int len;
@@ -644,7 +644,7 @@ static size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents,
 
 	sg_miter_stop(&miter);
 
-	local_irq_restore(flags);
+	local_irq_restore_nort(flags);
 	return offset;
 }
 
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