[PATCH 1/4] ARM: mm: use pteval_t to represent page protection values

[Catalin Marinas]

On Thu, Sep 20, 2012 at 04:56:42PM +0100, Will Deacon wrote:
> When updating the page protection map after calculating the user_pgprot
> value, the base protection map is temporarily stored in an unsigned long
> type, causing truncation of the protection bits when LPAE is enabled.
> This effectively means that calls to mprotect() will corrupt the upper
> page attributes, clearing the XN bit unconditionally.
> 
> This patch uses pteval_t to store the intermediate protection values,
> preserving the upper bits for 64-bit descriptors.
> 
> Signed-off-by: Will Deacon <will.deacon at arm.com>

Acked-by: Catalin Marinas <catalin.marinas at arm.com>