From ffaf038ccbccfac643c6a33ba99ade247cb4eb1f Mon Sep 17 00:00:00 2001
From: Salman Qazi <sqazi@google.com>
Date: Mon, 23 Feb 2009 18:03:04 -0800
Subject: [PATCH] --- yaml --- r: 136903 b: refs/heads/master c:
 30d697fa3a25fed809a873b17531a00282dc1234 h: refs/heads/master i:   136901:
 26b342baf49422659c94b579fcbfc79484180feb   136899:
 1fd9220227bed3cc1a5bb6572e51af012e76aa51   136895:
 304161795985d520e40209b05b3c4e12b7ccefa2 v: v3

---
 [refs]                                  |  2 +-
 trunk/arch/x86/include/asm/uaccess_64.h | 16 ++++++++++++++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index be18ccee88fa..8b3286feecce 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cb425afd2183e90a481bb211ff49361a117a3ecc
+refs/heads/master: 30d697fa3a25fed809a873b17531a00282dc1234
diff --git a/trunk/arch/x86/include/asm/uaccess_64.h b/trunk/arch/x86/include/asm/uaccess_64.h
index 84210c479fca..987a2c10fe20 100644
--- a/trunk/arch/x86/include/asm/uaccess_64.h
+++ b/trunk/arch/x86/include/asm/uaccess_64.h
@@ -192,14 +192,26 @@ static inline int __copy_from_user_nocache(void *dst, const void __user *src,
 					   unsigned size)
 {
 	might_sleep();
-	return __copy_user_nocache(dst, src, size, 1);
+	/*
+	 * In practice this limit means that large file write()s
+	 * which get chunked to 4K copies get handled via
+	 * non-temporal stores here. Smaller writes get handled
+	 * via regular __copy_from_user():
+	 */
+	if (likely(size >= PAGE_SIZE))
+		return __copy_user_nocache(dst, src, size, 1);
+	else
+		return __copy_from_user(dst, src, size);
 }
 
 static inline int __copy_from_user_inatomic_nocache(void *dst,
 						    const void __user *src,
 						    unsigned size)
 {
-	return __copy_user_nocache(dst, src, size, 0);
+	if (likely(size >= PAGE_SIZE))
+		return __copy_user_nocache(dst, src, size, 0);
+	else
+		return __copy_from_user_inatomic(dst, src, size);
 }
 
 unsigned long