On Sun, Dec 20, 2020 at 7:51 PM Linus Torvalds <torva...@linux-foundation.org> wrote: > > On Sun, Dec 20, 2020 at 10:22 AM Willem de Bruijn > <willemdebruijn.ker...@gmail.com> wrote: > > > > Slightly tangential, it's not immediately clear to me why in > > arch/x86/entry/syscalls/syscall_32.tbl epoll_pwait does not need a > > compat entry, unlike on other architectures and unlike signalfd. > > Hmm. Good question. That looks like a bug to me. Probably nobody > noticed because it's so rarely used. > > Or maybe I'm missing something too. > > Adding x86 entry code people to the participants.
The sigset_t argument is actually compatible between x86-32 and x86-64 because - The bits are in the same order on little-endian machines - _NSIG is the same as _COMPAT_NSIG (unlike old sparc kernels) - accessing a 64-bit with 32-bit alignment is always allowed on x86 All other architectures with compat mode support big-endian code at least as an option, so they have to use the compat version. Arnd