From: catalin.marinas@arm.com (Catalin Marinas)
Date: Mon, 10 Jun 2013 11:23:07 +0100
Subject: [PATCH V5] ARM: handle user space mapped pages in
 flush_kernel_dcache_page
In-Reply-To: <1370462344-7128-1-git-send-email-gmbnomis@gmail.com>
References: <1370462344-7128-1-git-send-email-gmbnomis@gmail.com>
Message-ID: <20130610102307.GC1947@darko.cambridge.arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Jun 05, 2013 at 08:59:04PM +0100, Simon Baatz wrote:
> Commit f8b63c1 made flush_kernel_dcache_page a no-op assuming that the pages
> it needs to handle are kernel mapped only.  However, for example when doing
> direct I/O, pages with user space mappings may occur.
> 
> Thus, continue to do lazy flushing if there are no user space mappings.
> Otherwise, flush the kernel cache lines directly.
> 
> Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
> Cc: <stable@vger.kernel.org> # 3.2+
> CC: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Russell King <linux@arm.linux.org.uk>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>