Re: [PATCH] s390: speedup strn{cpy,len}_from_user.

[Andrew Morton <akpm@osdl.org>]

Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
>
> [PATCH] s390: speedup strn{cpy,len}_from_user.
> 
> From: Martin Schwidefsky <schwidefsky@de.ibm.com>
> 
> Speedup strncpy_from_user and strnlen_from_user by using
> the search string instruction in the secondary space mode.

There were a few conflicts with Arnd's sparse annotation, which I fixed up.
Please check that next the -mm has it all right.

>  static inline long
>  strncpy_from_user(char *dst, const char *src, long count)
>  {
>          long res = -EFAULT;
>          might_sleep();
> -        if (access_ok(VERIFY_READ, src, 1))
> -                res = __strncpy_from_user_asm(dst, src, count);
> +        if (access_ok(VERIFY_READ, src, 1)) {
> +                res = __strncpy_from_user_asm(count, dst, src);
> +	}
>          return res;
>  }

Shouldn't the access_ok() check be passed `count', rather than `1'?