brcm2708: update linux 4.4 patches to latest version

As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0215-copy_from_user-CPU_SW_DOMAIN_PAN-compatibility.patch b/target/linux/brcm2708/patches-4.4/0215-copy_from_user-CPU_SW_DOMAIN_PAN-compatibility.patch
new file mode 100644
index 0000000000..0511407426
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0215-copy_from_user-CPU_SW_DOMAIN_PAN-compatibility.patch
@@ -0,0 +1,53 @@
+From 250a9cb281e520a1c22ff9dd86d2fb44fddb4fe9 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Tue, 29 Mar 2016 15:32:30 +0100
+Subject: [PATCH 215/304] copy_from_user: CPU_SW_DOMAIN_PAN compatibility
+
+The downstream copy_from_user acceleration must also play nice with
+CONFIG_CPU_SW_DOMAIN_PAN.
+
+See: https://github.com/raspberrypi/linux/issues/1381
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ arch/arm/lib/uaccess_with_memcpy.c | 14 +++++++++++---
+ 1 file changed, 11 insertions(+), 3 deletions(-)
+
+--- a/arch/arm/lib/uaccess_with_memcpy.c
++++ b/arch/arm/lib/uaccess_with_memcpy.c
+@@ -186,6 +186,7 @@ out:
+ unsigned long noinline
+ __copy_from_user_memcpy(void *to, const void __user *from, unsigned long n)
+ {
++	unsigned long ua_flags;
+ 	int atomic;
+ 
+ 	if (unlikely(segment_eq(get_fs(), KERNEL_DS))) {
+@@ -217,7 +218,9 @@ __copy_from_user_memcpy(void *to, const
+ 		if (tocopy > n)
+ 			tocopy = n;
+ 
++		ua_flags = uaccess_save_and_enable();
+ 		memcpy(to, (const void *)from, tocopy);
++		uaccess_restore(ua_flags);
+ 		to += tocopy;
+ 		from += tocopy;
+ 		n -= tocopy;
+@@ -261,9 +264,14 @@ arm_copy_from_user(void *to, const void
+ 	 * With frame pointer disabled, tail call optimization kicks in
+ 	 * as well making this test almost invisible.
+ 	 */
+-	if (n < COPY_FROM_USER_THRESHOLD)
+-		return __copy_from_user_std(to, from, n);
+-	return __copy_from_user_memcpy(to, from, n);
++	if (n < COPY_TO_USER_THRESHOLD) {
++		unsigned long ua_flags = uaccess_save_and_enable();
++		n = __copy_from_user_std(to, from, n);
++		uaccess_restore(ua_flags);
++	} else {
++		n = __copy_from_user_memcpy(to, from, n);
++	}
++	return n;
+ }
+ 	
+ static unsigned long noinline