1 files changed, 66 insertions, 37 deletions

diff --git a/Makefile b/Makefile
index 4635a64da36c..68ef80b30340 100644
--- a/Makefile
+++ b/Makefile
@@ -115,13 +115,20 @@ saved-output := $(KBUILD_OUTPUT)
 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
 $(if $(KBUILD_OUTPUT),, \
      $(error output directory "$(saved-output)" does not exist))
+# Check that OUTPUT directory is not the same as where we have kernel src
+$(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
+     $(error Output directory (O=...) specifies kernel src dir))
 
-PHONY += $(MAKECMDGOALS)
+PHONY += $(MAKECMDGOALS) sub-make
 
-$(filter-out _all,$(MAKECMDGOALS)) _all:
+$(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
+        $(Q)@:
+
+sub-make: FORCE
         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
         KBUILD_SRC=$(CURDIR) \
-        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
+        KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
+        $(filter-out _all sub-make,$(MAKECMDGOALS))
 
 # Leave processing to above invocation of make
 skip-makefile := 1
@@ -186,7 +193,8 @@ ARCH		?= $(SUBARCH)
 CROSS_COMPILE   ?=
 
 # Architecture as present in compile.h
-UTS_MACHINE := $(ARCH)
+UTS_MACHINE     := $(ARCH)
+SRCARCH         := $(ARCH)
 
 KCONFIG_CONFIG  ?= .config
 
@@ -310,25 +318,25 @@ LINUXINCLUDE    := -Iinclude \
                    $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
                    -include include/linux/autoconf.h
 
-CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
+KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
 
-CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
+KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
                    -fno-strict-aliasing -fno-common \
                    -Werror-implicit-function-declaration
-AFLAGS          := -D__ASSEMBLY__
+KBUILD_AFLAGS   := -D__ASSEMBLY__
 
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 
 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
-export ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
+export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 
-export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
-export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
-export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
+export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
+export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
+export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 
 # When compiling out-of-tree modules, put MODVERDIR in the module
 # tree rather than in the kernel tree. The kernel tree might
@@ -484,35 +492,41 @@ endif # $(dot-config)
 all: vmlinux
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-CFLAGS          += -Os
+KBUILD_CFLAGS   += -Os
 else
-CFLAGS          += -O2
+KBUILD_CFLAGS   += -O2
 endif
 
 include $(srctree)/arch/$(ARCH)/Makefile
 
 ifdef CONFIG_FRAME_POINTER
-CFLAGS          += -fno-omit-frame-pointer -fno-optimize-sibling-calls
+KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 else
-CFLAGS          += -fomit-frame-pointer
+KBUILD_CFLAGS   += -fomit-frame-pointer
 endif
 
 ifdef CONFIG_DEBUG_INFO
-CFLAGS          += -g
+KBUILD_CFLAGS   += -g
+KBUILD_AFLAGS   += -gdwarf-2
 endif
 
 # Force gcc to behave correct even for buggy distributions
-CFLAGS          += $(call cc-option, -fno-stack-protector)
+KBUILD_CFLAGS         += $(call cc-option, -fno-stack-protector)
 
 # arch Makefile may override CC so keep this after arch Makefile is included
 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 
 # warn about C99 declaration after statement
-CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
+KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 
 # disable pointer signed / unsigned warnings in gcc 4.0
-CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+
+# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
+KBUILD_CPPFLAGS += $(CPPFLAGS)
+KBUILD_AFLAGS   += $(AFLAGS)
+KBUILD_CFLAGS   += $(CFLAGS)
 
 # Use --build-id when available.
 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
@@ -609,7 +623,7 @@ libs-y		:= $(libs-y1) $(libs-y2)
 vmlinux-init := $(head-y) $(init-y)
 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
 vmlinux-all  := $(vmlinux-init) $(vmlinux-main)
-vmlinux-lds  := arch/$(ARCH)/kernel/vmlinux.lds
+vmlinux-lds  := arch/$(SRCARCH)/kernel/vmlinux.lds
 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
 
 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
@@ -760,6 +774,9 @@ vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o
 ifdef CONFIG_HEADERS_CHECK
         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 endif
+ifdef CONFIG_SAMPLES
+        $(Q)$(MAKE) $(build)=samples
+endif
         $(call vmlinux-modpost)
         $(call if_changed_rule,vmlinux__)
         $(Q)rm -f .old_version
@@ -862,7 +879,7 @@ ifneq ($(KBUILD_SRC),)
                 /bin/false; \
         fi;
         $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
-        $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
+        $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
 endif
 
 # prepare2 creates a makefile if using a separate output directory
@@ -894,9 +911,9 @@ export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
 # before switching between archs anyway.
 
 include/asm:
-        @echo '  SYMLINK $@ -> include/asm-$(ARCH)'
+        @echo '  SYMLINK $@ -> include/asm-$(SRCARCH)'
         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
-        @ln -fsn asm-$(ARCH) $@
+        @ln -fsn asm-$(SRCARCH) $@
 
 # Generate some files
 # ---------------------------------------------------------------------------
@@ -936,7 +953,8 @@ depend dep:
 INSTALL_HDR_PATH=$(objtree)/usr
 export INSTALL_HDR_PATH
 
-HDRARCHES=$(filter-out generic,$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
+HDRFILTER=generic i386 x86_64
+HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
 
 PHONY += headers_install_all
 headers_install_all: include/linux/version.h scripts_basic FORCE
@@ -947,11 +965,11 @@ headers_install_all: include/linux/version.h scripts_basic FORCE
 
 PHONY += headers_install
 headers_install: include/linux/version.h scripts_basic FORCE
-        @if [ ! -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
-          echo '*** Error: Headers not exportable for this architecture ($(ARCH))'; \
+        @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
+          echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
           exit 1 ; fi
         $(Q)$(MAKE) $(build)=scripts scripts/unifdef
-        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst obj=include
+        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
 
 PHONY += headers_check_all
 headers_check_all: headers_install_all
@@ -961,7 +979,7 @@ headers_check_all: headers_install_all
 
 PHONY += headers_check
 headers_check: headers_install
-        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst obj=include HDRCHECK=1
+        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
 
 # ---------------------------------------------------------------------------
 # Modules
@@ -1139,7 +1157,7 @@ help:
         @echo  '  cscope          - Generate cscope index'
         @echo  '  kernelrelease   - Output the release version string'
         @echo  '  kernelversion   - Output the version stored in Makefile'
-        @if [ -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
+        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
          echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
          fi
@@ -1147,7 +1165,8 @@ help:
         @echo  'Static analysers'
         @echo  '  checkstack      - Generate a list of stack hogs'
         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
-        @if [ -r $(srctree)/include/asm-$(ARCH)/Kbuild ]; then \
+        @echo  '  export_report   - List the usages of all exported symbols'
+        @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
          echo  '  headers_check   - Sanity check on exported headers'; \
          fi
         @echo  ''
@@ -1253,8 +1272,10 @@ $(clean-dirs):
         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 
 clean:  rm-dirs := $(MODVERDIR)
+clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
 clean: $(clean-dirs)
         $(call cmd,rmdirs)
+        $(call cmd,rmfiles)
         @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
                 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
@@ -1292,18 +1313,23 @@ ifeq ($(ALLSOURCE_ARCHS),)
 ifeq ($(ARCH),um)
 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
 else
-ALLINCLUDE_ARCHS := $(ARCH)
+ALLINCLUDE_ARCHS := $(SRCARCH)
 endif
 else
 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
 endif
 
+# Take care of arch/x86
+ifeq ($(ARCH), $(SRCARCH))
 ALLSOURCE_ARCHS := $(ARCH)
+else
+ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
+endif
 
 define find-sources
-        ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
-               find $(__srctree)arch/$${ARCH} $(RCS_FIND_IGNORE) \
+        ( for arch in $(ALLSOURCE_ARCHS) ; do \
+               find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
                     -name $1 -print; \
           done ; \
           find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
@@ -1311,8 +1337,8 @@ define find-sources
           find $(__srctree)include $(RCS_FIND_IGNORE) \
                \( -name config -o -name 'asm-*' \) -prune \
                -o -name $1 -print; \
-          for ARCH in $(ALLINCLUDE_ARCHS) ; do \
-               find $(__srctree)include/asm-$${ARCH} $(RCS_FIND_IGNORE) \
+          for arch in $(ALLINCLUDE_ARCHS) ; do \
+               find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
                     -name $1 -print; \
           done ; \
           find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
@@ -1404,6 +1430,9 @@ versioncheck:
 namespacecheck:
         $(PERL) $(srctree)/scripts/namespace.pl
 
+export_report:
+        $(PERL) $(srctree)/scripts/export_report.pl
+
 endif #ifeq ($(config-targets),1)
 endif #ifeq ($(mixed-targets),1)
 
@@ -1481,8 +1510,8 @@ quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files))
       cmd_rmfiles = rm -f $(rm-files)
 
 
-a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
-          $(NOSTDINC_FLAGS) $(CPPFLAGS) \
+a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
+          $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
           $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
 
 quiet_cmd_as_o_S = AS      $@