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Nicola Vetrini
26cdd09801
The constant 0 is used instead of NULL in '__ACCESS_ONCE' as a compile-time check to detect non-scalar types; its usage for this purpose is deviated. Furthermore, the 'typeof_field' macro is introduced as a general way to access the type of a struct member without declaring a variable of struct type. Both this macro and 'sizeof_field' are moved to 'xen/macros.h'. No functional change intended. Signed-off-by: Nicola Vetrini <nicola.vetrini@bugseng.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>