kbuild: only one call for include/ in make headers_*

Move it to the top-level file to decide if we install/check
the generic headers or the arch specific headers.

This revealed a long standing bug where "make headers_check_all"
relied on the files in asm/ for the current architecture.
So make headers_check_all is now broken by this commit.

In addition:

o add a simpler way to detect if an arch support
exporting header files.

o add 'set -e;' so we error out early if
make headers_check_all fails.

o add sparc64 and cris to arch we do not process
in make headers_*_all because:

sparc64 - use sparc to export headers
cris - is know seriously broken

Includes suggestions from: David Woodhouse
<[e-mail]>.

Signed-off-by: Sam Ravnborg <[e-mail]>
Cc: David Woodhouse <[e-mail]>

Makefile

···
 #Default location for installed headers
 export INSTALL_HDR_PATH = $(objtree)/usr
 
-hdr-filter := generic um ppc
+hdr-filter := generic um ppc sparc64 cris
 hdr-archs  := $(filter-out $(hdr-filter),                           \
                   $(patsubst $(srctree)/include/asm-%/Kbuild,%,     \
                       $(wildcard $(srctree)/include/asm-*/Kbuild)))
···
 
 PHONY += headers_install_all
 headers_install_all: __headers
+	$(Q)$(MAKE) $(hdr-inst)=include
 	$(Q)set -e; for arch in $(hdr-archs); do \
-	 $(MAKE) ARCH=$$arch SRCARCH=$$arch $(hdr-inst)=include \
-	         BIASMDIR=-bi-$$arch ;\
+	 $(MAKE) $(hdr-inst)=include/asm-$$arch   \
+	         SRCARCH=$$arch dst=include/asm-$$arch;  \
 	 done
 
 PHONY += headers_install
 headers_install: __headers
-	$(Q)if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
-	  echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
-	  exit 1 ; \
-	fi
-	$(Q)$(MAKE) $(hdr-inst)=include ARCH=$(SRCARCH)
+	$(if $(wildcard $(srctree)/include/asm-$(SRCARCH)/Kbuild),, \
+	$(error Headers not exportable for this architecture ($(SRCARCH))))
+	$(Q)$(MAKE) $(hdr-inst)=include
+	$(Q)$(MAKE) $(hdr-inst)=include/asm-$(SRCARCH) dst=include/asm
 
 PHONY += headers_check_all
 headers_check_all: headers_install_all
+	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
 	$(Q)set -e; for arch in $(hdr-archs); do \
-	 $(MAKE) ARCH=$$arch SRCARCH=$$arch $(hdr-inst)=include \
-	         BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
+	 $(MAKE) SRCARCH=$$arch $(hdr-inst)=include/asm-$$arch HDRCHECK=1 ;\
 	 done
 
 PHONY += headers_check
 headers_check: headers_install
-	$(Q)$(MAKE) $(hdr-inst)=include ARCH=$(SRCARCH) HDRCHECK=1
+	$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
+	$(Q)$(MAKE) $(hdr-inst)=include/asm-$(SRCARCH) \
+	            dst=include/asm HDRCHECK=1
 
 # ---------------------------------------------------------------------------
 # Modules

include/Kbuild

···
+# Top-level Makefile calls into asm-$(ARCH)
+# List only non-arch directories below
+
 header-y += asm-generic/
 header-y += linux/
 header-y += sound/
···
 header-y += rdma/
 header-y += video/
 header-y += drm/
-
-header-y += asm-$(ARCH)/

scripts/Makefile.headersinst

···
 
 include scripts/Kbuild.include
 
-# If this is include/asm-$(ARCH) then override $(_dst) so that
-# we install to include/asm directly.
-# Unless $(BIASMDIR) is set, in which case we're probably doing
-# a 'headers_install_all' build and we should keep the -$(ARCH)
-# in the directory name.
-ifeq ($(obj),include/asm-$(ARCH)$(BIASMDIR))
-     _dst := include/asm
-endif
-
 install := $(INSTALL_HDR_PATH)/$(_dst)
 
 header-y	:= $(sort $(header-y) $(unifdef-y))