From: Vinayak Kale <vkale@apm.com>
Date: Wed, 5 Feb 2014 09:34:36 +0000 (+0000)
Subject: arm64: add DSB after icache flush in __flush_icache_all()
X-Git-Tag: firefly_0821_release~3679^2~2840
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=02599bad3774a5147eb8d98df7c9362fdc1a50c6;p=firefly-linux-kernel-4.4.55.git

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@apm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 3300cbd18a89..0c13554965b8 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) \