On Thu, Sep 03, 2020 at 04:22:40PM +0200, Christoph Hellwig wrote:
> diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S
> index c8a85b512796e1..94f7be4971ed04 100644
> --- a/arch/x86/lib/getuser.S
> +++ b/arch/x86/lib/getuser.S
> @@ -35,10 +35,19 @@
> #include <asm/smap.h>
> #include <asm/export.h>
>
> +#ifdef CONFIG_X86_5LEVEL
> +#define LOAD_TASK_SIZE_MINUS_N(n) \
> + ALTERNATIVE "mov $((1 << 47) - 4096 - (n)),%rdx", \
> + "mov $((1 << 56) - 4096 - (n)),%rdx", X86_FEATURE_LA57
> +#else
> +#define LOAD_TASK_SIZE_MINUS_N(n) \
> + mov $(TASK_SIZE_MAX - (n)),%_ASM_DX
> +#endif
Wait a sec... how is that supposed to build with X86_5LEVEL? Do you mean
#define LOAD_TASK_SIZE_MINUS_N(n) \
ALTERNATIVE __stringify(mov $((1 << 47) - 4096 - (n)),%rdx), \
__stringify(mov $((1 << 56) - 4096 - (n)),%rdx),
X86_FEATURE_LA57
there?
