linux-kernel - [PATCH 3.12 13/32] arm64: add DSB after icache flush in __flush_icache

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Message-Id: <20140218224500.480004750@linuxfoundation.org>
Date:	Tue, 18 Feb 2014 14:47:13 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Vinayak Kale <vkale@....com>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 3.12 13/32] arm64: add DSB after icache flush in __flush_icache_all()

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vinayak Kale <vkale@....com>

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

---
 arch/arm64/include/asm/cacheflush.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -116,6 +116,7 @@ extern void flush_dcache_page(struct pag
 static inline void __flush_icache_all(void)
 {
 	asm("ic	ialluis");
+	dsb();
 }
 
 #define flush_dcache_mmap_lock(mapping) \


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