sh: panic on machvec section misalignment.
Now that __initmv references the machvec section unconditionally
there have been cases where folks have been mistakenly flagging
non-machvec structures with the machvec section attribute (presumably
to shut up modpost). This leads to obscure breakage in earlyprintk
amongst other places and is rather non-obvious.
Add a simple sanity check to try and catch __initmv misuse and
panic early.
Reported-by: Markus Brunner <super.firetwister@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c
index 23c5948..129b2cf 100644
--- a/arch/sh/kernel/machvec.c
+++ b/arch/sh/kernel/machvec.c
@@ -91,6 +91,13 @@
(unsigned long)&__machvec_start);
/*
+ * Sanity check for machvec section alignment. Ensure
+ * __initmv hasn't been misused.
+ */
+ if (machvec_size % sizeof(struct sh_machine_vector))
+ panic("machvec misaligned, invalid __initmv use?");
+
+ /*
* If the machvec hasn't been preselected, use the first
* vector (usually the only one) from .machvec.init.
*/