Re: [PATCH v2 2/2] vsock: Enable y2038 safe timeval for timeout

[Jakub Kicinski]

On Thu,  7 Oct 2021 13:31:47 +0100 Richard Palethorpe wrote:
> Reuse the timeval compat code from core/sock to handle 32-bit and
> 64-bit timeval structures. Also introduce a new socket option define
> to allow using y2038 safe timeval under 32-bit.
> 
> The existing behavior of sock_set_timeout and vsock's timeout setter
> differ when the time value is out of bounds. vsocks current behavior
> is retained at the expense of not being able to share the full
> implementation.
> 
> This allows the LTP test vsock01 to pass under 32-bit compat mode.
> 
> Fixes: fe0c72f3db11 ("socket: move compat timeout handling into sock.c")
> Signed-off-by: Richard Palethorpe <rpalethorpe@xxxxxxxx>
> Cc: Richard Palethorpe <rpalethorpe@xxxxxxxxxxxx>

This breaks 32bit x86 build:

ERROR: modpost: "__divdi3" [net/vmw_vsock/vsock.ko] undefined!

If the 64 bit division is intention you need to use an appropriate
helper.