From 44a4a66b619a0a83a52e707ebcd80182207bd50e Mon Sep 17 00:00:00 2001
From: Matthew Wilcox <willy@infradead.org>
Date: Mon, 5 Nov 2018 10:53:09 -0500
Subject: [PATCH] XArray: Correct xa_store_range

The explicit '64' should have been BITS_PER_LONG, but while looking at
this code I realised I meant to use __ffs(), not ilog2().

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---
 lib/xarray.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/xarray.c b/lib/xarray.c
index 7946380cd6c9..bbacca576593 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1565,8 +1565,9 @@ void *xa_store_range(struct xarray *xa, unsigned long first,
 	do {
 		xas_lock(&xas);
 		if (entry) {
-			unsigned int order = (last == ~0UL) ? 64 :
-						ilog2(last + 1);
+			unsigned int order = BITS_PER_LONG;
+			if (last + 1)
+				order = __ffs(last + 1);
 			xas_set_order(&xas, last, order);
 			xas_create(&xas);
 			if (xas_error(&xas))
-- 
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