diff --git a/[refs] b/[refs]
index b794dd4b5241..b065da9a3144 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9ffbb9162312fd8113037cb3d94f787f06bbfa9a
+refs/heads/master: 7762f5a0b709b415fda132258ad37b9f2a1db994
diff --git a/trunk/include/linux/fs.h b/trunk/include/linux/fs.h
index 34406ed467c3..661c7c572149 100644
--- a/trunk/include/linux/fs.h
+++ b/trunk/include/linux/fs.h
@@ -656,7 +656,11 @@ static inline loff_t i_size_read(struct inode *inode)
 #endif
 }
 
-
+/*
+ * NOTE: unlike i_size_read(), i_size_write() does need locking around it
+ * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
+ * can be lost, resulting in subsequent i_size_read() calls spinning forever.
+ */
 static inline void i_size_write(struct inode *inode, loff_t i_size)
 {
 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)