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Subject[PATCH] x86/boot: Correctly deeclare error() as noreturn
The compressed boot function error() is used to halt execution, but it
wasn't marked with "noreturn". This fixes that in preparation for
supporting kernel FORTIFY_SOURCE, which uses the noreturn annotation
on panic, and calls error(). GCC would warn about a noreturn function
calling a non-noreturn function:

arch/x86/boot/compressed/misc.c: In function ‘fortify_panic’:
arch/x86/boot/compressed/misc.c:416:1: warning: ‘noreturn’ function does return
}
^

Cc: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
arch/x86/boot/compressed/error.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/error.h b/arch/x86/boot/compressed/error.h
index 2e59dac07f9e..d732e608e3af 100644
--- a/arch/x86/boot/compressed/error.h
+++ b/arch/x86/boot/compressed/error.h
@@ -1,7 +1,9 @@
#ifndef BOOT_COMPRESSED_ERROR_H
#define BOOT_COMPRESSED_ERROR_H

+#include <linux/compiler.h>
+
void warn(char *m);
-void error(char *m);
+void error(char *m) __noreturn;

#endif /* BOOT_COMPRESSED_ERROR_H */
--
2.7.4

--
Kees Cook
Pixel Security

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