From 3715863aa142c4f4c5208f5f3e5e9bac06006d2f Mon Sep 17 00:00:00 2001
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Tue, 4 Mar 2008 14:29:27 -0800
Subject: iommu: export iommu_is_span_boundary helper function

iommu_is_span_boundary is used internally in the IOMMU helper
(lib/iommu-helper.c), a primitive function that judges whether a memory area
spans LLD's segment boundary or not.

It's difficult to convert some IOMMUs to use the IOMMU helper but
iommu_is_span_boundary is still useful for them.  So this patch exports it.

This is needed for the parisc iommu fixes.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 lib/iommu-helper.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 495575a59ca6..a3b8d4c3f77a 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -40,10 +40,12 @@ static inline void set_bit_area(unsigned long *map, unsigned long i,
 	}
 }
 
-static inline int is_span_boundary(unsigned int index, unsigned int nr,
-				   unsigned long shift,
-				   unsigned long boundary_size)
+int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+			   unsigned long shift,
+			   unsigned long boundary_size)
 {
+	BUG_ON(!is_power_of_2(boundary_size));
+
 	shift = (shift + index) & (boundary_size - 1);
 	return shift + nr > boundary_size;
 }
@@ -57,7 +59,7 @@ unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
 again:
 	index = find_next_zero_area(map, size, start, nr, align_mask);
 	if (index != -1) {
-		if (is_span_boundary(index, nr, shift, boundary_size)) {
+		if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
 			/* we could do more effectively */
 			start = index + 1;
 			goto again;
-- 
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