Commit 5556410e authored Aug 07, 2007 by Paul Mundt

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>

parent 662ae216

arch/sh/kernel/machvec.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -90,6 +90,13 @@ void __init sh_mv_setup(void)
		machvec_size = ((unsigned long)&__machvec_end -
		(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.