linux/must_be.h: Add must_be() to improve readability of BUILD_BUG_ON_ZERO()

Historically, BUILD_BUG_ON_ZERO() has been hard to read.
__must_be_array() is based on BUILD_BUG_ON_ZERO(),
and unlike BUILD_BUG_ON_*(),
it has a pretty readable name.

Let's generalize it with this kind of usage:

	#define __must_be_array(a)  must_be(__is_array(a))

So next step is to create macros of the kind:
__is_array(a)

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/must_be.h b/include/linux/must_be.h
new file mode 100644
index 000000000000..a2e0b0c890a6
--- /dev/null
+++ b/include/linux/must_be.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_MUST_BE_H
+#define _LINUX_MUST_BE_H
+
+
+#define __must_be(e)  BUILD_BUG_ON_ZERO(!(e))
+
+
+#endif	/* _LINUX_MUST_BE_H */