[3.11.y.z extended stable] Patch "arm64: add DSB after icache flush in __flush_icache_all()" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    arm64: add DSB after icache flush in __flush_icache_all()

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 2e62915da94dd5d01d918a66f13d973c53b045f9 Mon Sep 17 00:00:00 2001
From: Vinayak Kale <vkale at apm.com>
Date: Wed, 5 Feb 2014 09:34:36 +0000
Subject: arm64: add DSB after icache flush in __flush_icache_all()

commit 5044bad43ee573d0b6d90e3ccb7a40c2c7d25eb4 upstream.

Add DSB after icache flush to complete the cache maintenance operation.
The function __flush_icache_all() is used only for user space mappings
and an ISB is not required because of an exception return before executing
user instructions. An exception return would behave like an ISB.

Signed-off-by: Vinayak Kale <vkale at apm.com>
Acked-by: Will Deacon <will.deacon at arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 arch/arm64/include/asm/cacheflush.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index fea9ee3..88932498 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -116,6 +116,7 @@ extern void flush_dcache_page(struct page *);
 static inline void __flush_icache_all(void)
 {
 	asm("ic	ialluis");
+	dsb();
 }

 #define flush_dcache_mmap_lock(mapping) \
--
1.8.3.2