Re: [PATCH v8 1/8] arm64: add type casts to untagged_addr macro

[Catalin Marinas]

On Thu, Nov 08, 2018 at 03:36:08PM +0100, Andrey Konovalov wrote:
> This patch makes the untagged_addr macro accept all kinds of address types
> (void *, unsigned long, etc.) and allows not to specify type casts in each
> place where it is used. This is done by using __typeof__.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> ---
>  arch/arm64/include/asm/uaccess.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
> index 07c34087bd5e..c1325271e368 100644
> --- a/arch/arm64/include/asm/uaccess.h
> +++ b/arch/arm64/include/asm/uaccess.h
> @@ -101,7 +101,8 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si
>   * up with a tagged userland pointer. Clear the tag to get a sane pointer to
>   * pass on to access_ok(), for instance.
>   */
> -#define untagged_addr(addr)		sign_extend64(addr, 55)
> +#define untagged_addr(addr)		\
> +	((__typeof__(addr))sign_extend64((__u64)(addr), 55))

Nitpick: same comment as here (use u64):

http://lkml.kernel.org/r/20181123173739.osgvnnhmptdgtlnl@xxxxxxxxxxxxxxxxxxxxxxxxx

Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>

(not acking the whole series just yet, only specific patches to remember
what I reviewed)