Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers

From: Andy Lutomirski
Date: Wed Mar 09 2016 - 12:58:47 EST

On Tue, Mar 8, 2016 at 5:24 PM, Andy Lutomirski <luto@xxxxxxxxxx> wrote:
> musl implements system call cancellation in an unusual but clever way.
> When a thread issues a cancellable syscall, musl issues the syscall
> through a special thunk that looks roughly like this:

FWIW, this patch fails disastrously on 64-bit kernels. I fixed it,
but it needs kbuild changes. I'll send those out to the maintainers.