linux-kernel - [PATCH] powerpc/boot: fix broken way to pass CONFIG options

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Date:   Mon, 13 May 2019 20:22:54 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Rob Herring <robh@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org,
        "Rodrigo R. Galvao" <rosattig@...ux.vnet.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>,
        Mark Greer <mgreer@...malcreek.com>
Subject: [PATCH] powerpc/boot: fix broken way to pass CONFIG options

Commit 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to wrapper")
was wrong, but commit e41b93a6be57 ("powerpc/boot: Fix build failures
with -j 1") was also wrong.

Check-in source files never ever depend on build artifacts.

The correct dependency is:

  $(obj)/serial.o: $(obj)/autoconf.h

However, copying autoconf.h to arch/power/boot/ is questionable
in the first place.

arch/powerpc/Makefile adopted multiple ways to pass CONFIG options.

arch/powerpc/boot/decompress.c references CONFIG_KERNEL_GZIP and
CONFIG_KERNEL_XZ, which are passed via the command line.

arch/powerpc/boot/serial.c includes the copied autoconf.h to
reference a couple of CONFIG options.

Do not do this.

We should have already learned that including autoconf.h from each
source file is really fragile.

In fact, it is already broken.

arch/powerpc/boot/ppc_asm.h references CONFIG_PPC_8xx, but
arch/powerpc/boot/utils.S is not given any way to access CONFIG
options. So, CONFIG_PPC_8xx is never defined here.

Just pass $(LINUXINCLUDE) and remove all broken code.

I also removed the -traditional flag to make include/linux/kconfig.h
work. I do not understand why it needs to imitate the behavior of
pre-standard C preprocessors.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 arch/powerpc/boot/.gitignore |  2 --
 arch/powerpc/boot/Makefile   | 14 +++-----------
 arch/powerpc/boot/serial.c   |  1 -
 3 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/boot/.gitignore b/arch/powerpc/boot/.gitignore
index 32034a0cc554..6610665fcf5e 100644
--- a/arch/powerpc/boot/.gitignore
+++ b/arch/powerpc/boot/.gitignore
@@ -44,5 +44,3 @@ fdt_sw.c
 fdt_wip.c
 libfdt.h
 libfdt_internal.h
-autoconf.h
-
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 73d1f3562978..b8a82be2af2a 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -20,9 +20,6 @@
 
 all: $(obj)/zImage
 
-compress-$(CONFIG_KERNEL_GZIP) := CONFIG_KERNEL_GZIP
-compress-$(CONFIG_KERNEL_XZ)   := CONFIG_KERNEL_XZ
-
 ifdef CROSS32_COMPILE
     BOOTCC := $(CROSS32_COMPILE)gcc
     BOOTAR := $(CROSS32_COMPILE)ar
@@ -34,7 +31,7 @@ endif
 BOOTCFLAGS    := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 		 -fno-strict-aliasing -O2 -msoft-float -mno-altivec -mno-vsx \
 		 -pipe -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
-		 -D$(compress-y)
+		 $(LINUXINCLUDE)
 
 ifdef CONFIG_PPC64_BOOT_WRAPPER
 BOOTCFLAGS	+= -m64
@@ -51,7 +48,7 @@ BOOTCFLAGS	+= -mlittle-endian
 BOOTCFLAGS	+= $(call cc-option,-mabi=elfv2)
 endif
 
-BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
+BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -nostdinc
 
 BOOTARFLAGS	:= -cr$(KBUILD_ARFLAGS)
 
@@ -202,14 +199,9 @@ $(obj)/empty.c:
 $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds : $(obj)/%: $(srctree)/$(src)/%.S
 	$(Q)cp $< $@
 
-$(srctree)/$(src)/serial.c: $(obj)/autoconf.h
-
-$(obj)/autoconf.h: $(obj)/%: $(objtree)/include/generated/%
-	$(Q)cp $< $@
-
 clean-files := $(zlib-) $(zlibheader-) $(zliblinuxheader-) \
 		$(zlib-decomp-) $(libfdt) $(libfdtheader) \
-		autoconf.h empty.c zImage.coff.lds zImage.ps3.lds zImage.lds
+		empty.c zImage.coff.lds zImage.ps3.lds zImage.lds
 
 quiet_cmd_bootcc = BOOTCC  $@
       cmd_bootcc = $(BOOTCC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index b0491b8c0199..9457863147f9 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -18,7 +18,6 @@
 #include "stdio.h"
 #include "io.h"
 #include "ops.h"
-#include "autoconf.h"
 
 static int serial_open(void)
 {
-- 
2.17.1