linux-kernel - [PATCH] x86, boot: Explicitly include autoconf.h for hostprogs

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Date:	Fri, 12 Oct 2012 11:19:59 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	x86@...nel.org, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] x86, boot: Explicitly include autoconf.h for hostprogs

From: Matt Fleming <matt.fleming@...el.com>

The hostprogs need access to the CONFIG_* symbols found in
include/generated/autoconf.h. commit abbf1590 ("UAPI: Partition the
header include path sets and add uapi/ header directories") replaced
$(LINUXINCLUDE) with $(USERINCLUDE) which doesn't contain the
necessary include paths.

This has the undesirable effect of breaking the EFI boot stub because
the #ifdef CONFIG_EFI_STUB code in arch/x86/boot/tools/build.c is
never compiled.

It should also be noted that because $(USERINCLUDE) isn't exported by
the top-level Makefile it's actually empty in arch/x86/boot/Makefile.

Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Acked-by: David Howells <dhowells@...hat.com>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---

Linus, I expected this fix to go through -tip but Ingo explained that
the offending commit (abbf1590) doesn't exist in -tip yet, which is
why I'm sending this directly to you.

 arch/x86/boot/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index ce03476..ccce0ed 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -37,7 +37,8 @@ setup-y		+= video-bios.o
 targets		+= $(setup-y)
 hostprogs-y	:= mkcpustr tools/build

-HOST_EXTRACFLAGS += -I$(srctree)/tools/include $(USERINCLUDE) \
+HOST_EXTRACFLAGS += -I$(srctree)/tools/include \
+		    -include include/generated/autoconf.h \
 	            -D__EXPORTED_HEADERS__

 $(obj)/cpu.o: $(obj)/cpustr.h
-- 
1.7.11.4

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