From 5de2b61a63f0982641eb00b9a6a9650f23487eaa Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Tue, 9 Dec 2014 16:45:17 +0100 Subject: [PATCH] x86/asm: Guard against building the 32/64-bit versions of the asm-offsets*.c file directly Sometimes it is helpful to build a kernel compilation unit directly, i.e.: make .../.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 Signed-off-by: Borislav Petkov Cc: Michal Marek Cc: Linus Torvalds Link: http://lkml.kernel.org/r/1418139917-12722-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar --- 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..3b3b9d33ac1d 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 #include diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c index e7c798b354fa..4c0c596dfb95 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 #define __SYSCALL_64(nr, sym, compat) [nr] = 1, -- 2.20.1