Re: [PATCH 17/18] arm64: convert compat wrappers to C

[Christoph Hellwig]

> +COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
> +                    compat_size_t, sz, struct compat_statfs64 __user *, buf)
> +{
> +     if (sz == 88)
> +             sz = 84;
> +
> +     return kcompat_sys_statfs64(pathname, sz, buf);

This really needs a comment, and it looks very obviously bogus.
In case it isn't it needs a very good explanation.