On Wed, Sep 23, 2020 at 08:05:43AM +0200, Christoph Hellwig wrote:
>  COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
> -             const struct compat_iovec __user *,vec,
> +             const struct iovec __user *, vec,

Um...  Will it even compile?

>  #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
>  COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
> -             const struct compat_iovec __user *,vec,
> +             const struct iovec __user *, vec,

Ditto.  Look into include/linux/compat.h and you'll see

asmlinkage long compat_sys_preadv64(unsigned long fd,
                const struct compat_iovec __user *vec,
                unsigned long vlen, loff_t pos);

How does that manage to avoid the compiler screaming bloody
murder?

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