linux-kernel - [patch] MTD: fix cfi_interleave() build errors

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Date:	Mon, 1 Oct 2007 07:01:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [patch] MTD: fix cfi_interleave() build errors


* Ingo Molnar <mingo@...e.hu> wrote:

> FYI, the attached .config fails with the build errors below. Kernel is 
> latest 2.6.23-git. Found via make randconfig.

the quick fix below resolves these build failures. (i guess it might be 
cleaner/safer to solve this via excluding this .config combination via 
Kconfig rules, but that looks too involved for now.)

	Ingo

---------------->
Subject: MTD: fix cfi_interleave() build errors
From: Ingo Molnar <mingo@...e.hu>

if the .config specifies no cfi_interleave() then generate a
run-time bug. This makes 'make randconfig' build tests work again.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/mtd/cfi.h |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/include/linux/mtd/cfi.h
===================================================================
--- linux.orig/include/linux/mtd/cfi.h
+++ linux/include/linux/mtd/cfi.h
@@ -57,6 +57,10 @@
 #define cfi_interleave_is_8(cfi) (0)
 #endif
 
+#ifndef cfi_interleave
+# define cfi_interleave(cfi) ({ BUG_ON(1); 0; })
+#endif
+
 static inline int cfi_interleave_supported(int i)
 {
 	switch (i) {
-
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