[PATCH v2 02/10] selftests: liveupdate: Add tests for preserve and retrieve user argument

[sashiko-bot at kernel.org]

> From: Pasha Tatashin <pasha.tatashin at soleen.com>
> 
> Verify the user argument support in LIVEUPDATE_SESSION_PRESERVE_FD and
> LIVEUPDATE_SESSION_RETRIEVE_FD. Add luo_session_preserve_fd_arg() and
> luo_session_retrieve_fd_arg() helpers to libliveupdate so tests can pass
> a handler-specific argument.
> 
> Add a preserve_memfd_with_arg test case to verify that memfd
> preservation rejects a non-zero argument with -EOPNOTSUPP, accepts an
> explicit zero argument, and remains compatible with callers passing the
> legacy struct size up to the token field.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin at soleen.com>
> Signed-off-by: David Matlack <dmatlack at google.com>

Sashiko has reviewed this patch and found no issues.

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