[PATCH v16 01/16] uaccess: add untagged_addr definition for other arches

[khalid.aziz at oracle.com (Khalid Aziz)]

On 6/3/19 10:55 AM, Andrey Konovalov wrote:
> To allow arm64 syscalls to accept tagged pointers from userspace, we must
> untag them when they are passed to the kernel. Since untagging is done in
> generic parts of the kernel, the untagged_addr macro needs to be defined
> for all architectures.
> 
> Define it as a noop for architectures other than arm64.
> 
> Acked-by: Catalin Marinas <catalin.marinas at arm.com>
> Reviewed-by: Khalid Aziz <khalid.aziz at oracle.com>
> Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
> ---
>  include/linux/mm.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0e8834ac32b7..949d43e9c0b6 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -99,6 +99,10 @@ extern int mmap_rnd_compat_bits __read_mostly;
>  #include <asm/pgtable.h>
>  #include <asm/processor.h>
>  
> +#ifndef untagged_addr
> +#define untagged_addr(addr) (addr)
> +#endif
> +
>  #ifndef __pa_symbol
>  #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
>  #endif
> 

Andrey,

This patch has now become part of the other patch series Chris Hellwig
has sent out -
<https://lore.kernel.org/lkml/20190601074959.14036-1-hch at lst.de/>. Can
you coordinate with that patch series?

--
Khalid