[PATCH v3 6/6] arm64: kernel: Add support for Privileged Access Never

[Catalin Marinas]

On Tue, Jul 21, 2015 at 01:23:31PM +0100, James Morse wrote:
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index 94d98cd1aad8..149a36ea9673 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -30,9 +30,11 @@
>  #include <linux/highmem.h>
>  #include <linux/perf_event.h>
>  
> +#include <asm/cpufeature.h>
>  #include <asm/exception.h>
>  #include <asm/debug-monitors.h>
>  #include <asm/esr.h>
> +#include <asm/sysreg.h>
>  #include <asm/system_misc.h>
>  #include <asm/pgtable.h>
>  #include <asm/tlbflush.h>
> @@ -147,6 +149,13 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
>  		__do_kernel_fault(mm, addr, esr, regs);
>  }
>  
> +static bool pan_enabled(struct pt_regs *regs)
> +{
> +	if (IS_ENABLED(CONFIG_ARM64_PAN))
> +		return ((regs->pstate & PSR_PAN_BIT) != 0);

Nitpick: no brackets needed for return.

Otherwise the patch looks fine to me:

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