From: Borislav Petkov <[email protected]>
Sometimes it is helpful to build a kernel compilation unit directly, i.e.
make .../<filename>.i
in order to look at compiler output.
Since asm-offsets_{32,64}.c are included by asm-offsets.c and building
them directly doesn't evaluate the macros used (thus making the
preprocessor output not very useful), error out when an attempt is made
to build them. Issue a hint for the user to build asm-offsets.c instead.
Suggested-by: Michael Matz <[email protected]>
Cc: Michal Marek <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
---
arch/x86/kernel/asm-offsets_32.c | 4 ++++
arch/x86/kernel/asm-offsets_64.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c
index d67c4be3e8b1..207c48278dff 100644
--- a/arch/x86/kernel/asm-offsets_32.c
+++ b/arch/x86/kernel/asm-offsets_32.c
@@ -1,3 +1,7 @@
+#ifndef __LINUX_KBUILD_H
+#error "Please do not build this file directly, build asm-offsets.c instead"
+#endif
+
#include <asm/ucontext.h>
#include <linux/lguest.h>
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 4f9359f36bb7..7fcb2312b532 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -1,3 +1,7 @@
+#ifndef __LINUX_KBUILD_H
+#error "Please do not build this file directly, build asm-offsets.c instead"
+#endif
+
#include <asm/ia32.h>
#define __SYSCALL_64(nr, sym, compat) [nr] = 1,
--
2.0.0
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