From 52f993b8e89487ec9ee15a7fb4979e0f09a45b27 Mon Sep 17 00:00:00 2001
From: Yunhong Jiang <yunhong.jiang@linux.intel.com>
Date: Wed, 8 Mar 2017 23:13:28 -0800
Subject: Upgrade to 4.4.50-rt62

The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it
to 4.4.50-rt62.
The command to achieve it is:
a) Clone a git repo from
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

b) Get the diff between this two changesets:
git diff 640eca2901f3435e616157b11379d3223a44b391
705619beeea1b0b48219a683fd1a901a86fdaf5e

where the two commits are:
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
640eca2901f3435e616157b11379d3223a44b391
640eca2901f3 v4.4.6-rt14
localversion-rt
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
705619beeea1b0b48219a683fd1a901a86fdaf5e
705619beeea1 Linux 4.4.50-rt62
localversion-rt

c) One patch has been backported thus revert the patch before applying.

 filterdiff -p1 -x scripts/package/Makefile
~/tmp/v4.4.6-rt14-4.4.50-rt62.diff  |patch -p1 --dry-run

Upstream status: backport

Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
---
 kernel/arch/sh/include/asm/uaccess.h    | 5 ++++-
 kernel/arch/sh/include/asm/uaccess_64.h | 1 +
 kernel/arch/sh/mm/kmap.c                | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

(limited to 'kernel/arch/sh')

diff --git a/kernel/arch/sh/include/asm/uaccess.h b/kernel/arch/sh/include/asm/uaccess.h
index a49635c51..92ade79ac 100644
--- a/kernel/arch/sh/include/asm/uaccess.h
+++ b/kernel/arch/sh/include/asm/uaccess.h
@@ -151,7 +151,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
 	__kernel_size_t __copy_size = (__kernel_size_t) n;
 
 	if (__copy_size && __access_ok(__copy_from, __copy_size))
-		return __copy_user(to, from, __copy_size);
+		__copy_size = __copy_user(to, from, __copy_size);
+
+	if (unlikely(__copy_size))
+		memset(to + (n - __copy_size), 0, __copy_size);
 
 	return __copy_size;
 }
diff --git a/kernel/arch/sh/include/asm/uaccess_64.h b/kernel/arch/sh/include/asm/uaccess_64.h
index c01376c76..ca5073dd4 100644
--- a/kernel/arch/sh/include/asm/uaccess_64.h
+++ b/kernel/arch/sh/include/asm/uaccess_64.h
@@ -24,6 +24,7 @@
 #define __get_user_size(x,ptr,size,retval)			\
 do {								\
 	retval = 0;						\
+	x = 0;							\
 	switch (size) {						\
 	case 1:							\
 		retval = __get_user_asm_b((void *)&x,		\
diff --git a/kernel/arch/sh/mm/kmap.c b/kernel/arch/sh/mm/kmap.c
index ec29e14ec..bf25d7c79 100644
--- a/kernel/arch/sh/mm/kmap.c
+++ b/kernel/arch/sh/mm/kmap.c
@@ -36,6 +36,7 @@ void *kmap_coherent(struct page *page, unsigned long addr)
 
 	BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
 
+	preempt_disable();
 	pagefault_disable();
 
 	idx = FIX_CMAP_END -
@@ -64,4 +65,5 @@ void kunmap_coherent(void *kvaddr)
 	}
 
 	pagefault_enable();
+	preempt_enable();
 }
-- 
cgit 1.2.3-korg