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?