linux-kernel - [PATCH AUTOSEL 4.4 2/4] MIPS: fix build on non-linux hosts

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Date:   Wed, 10 Jul 2019 11:03:47 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk>,
        Jo-Philipp Wich <jo@...n.io>,
        Petr Štetiar <ynezz@...e.cz>,
        Paul Burton <paul.burton@...s.com>, linux-mips@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4 2/4] MIPS: fix build on non-linux hosts

From: Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk>

[ Upstream commit 1196364f21ffe5d1e6d83cafd6a2edb89404a3ae ]

calc_vmlinuz_load_addr.c requires SZ_64K to be defined for alignment
purposes.  It included "../../../../include/linux/sizes.h" to define
that size, however "sizes.h" tries to include <linux/const.h> which
assumes linux system headers.  These may not exist eg. the following
error was encountered when building Linux for OpenWrt under macOS:

In file included from arch/mips/boot/compressed/calc_vmlinuz_load_addr.c:16:
arch/mips/boot/compressed/../../../../include/linux/sizes.h:11:10: fatal error: 'linux/const.h' file not found
         ^~~~~~~~~~

Change makefile to force building on local linux headers instead of
system headers.  Also change eye-watering relative reference in include
file spec.

Thanks to Jo-Philip Wich & Petr Štetiar for assistance in tracking this
down & fixing.

Suggested-by: Jo-Philipp Wich <jo@...n.io>
Signed-off-by: Petr Štetiar <ynezz@...e.cz>
Signed-off-by: Kevin Darbyshire-Bryant <ldir@...byshire-bryant.me.uk>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Cc: linux-mips@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/boot/compressed/Makefile                 | 2 ++
 arch/mips/boot/compressed/calc_vmlinuz_load_addr.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index d5bdee115f22..d4918a2bca1b 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -66,6 +66,8 @@ OBJCOPYFLAGS_piggy.o := --add-section=.image=$(obj)/vmlinux.bin.z \
 $(obj)/piggy.o: $(obj)/dummy.o $(obj)/vmlinux.bin.z FORCE
 	$(call if_changed,objcopy)
 
+HOSTCFLAGS_calc_vmlinuz_load_addr.o += $(LINUXINCLUDE)
+
 # Calculate the load address of the compressed kernel image
 hostprogs-y := calc_vmlinuz_load_addr
 
diff --git a/arch/mips/boot/compressed/calc_vmlinuz_load_addr.c b/arch/mips/boot/compressed/calc_vmlinuz_load_addr.c
index 542c3ede9722..d14f75ec8273 100644
--- a/arch/mips/boot/compressed/calc_vmlinuz_load_addr.c
+++ b/arch/mips/boot/compressed/calc_vmlinuz_load_addr.c
@@ -13,7 +13,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include "../../../../include/linux/sizes.h"
+#include <linux/sizes.h>
 
 int main(int argc, char *argv[])
 {
-- 
2.20.1