minimal build fixes for uml (fallout from x86 merge)

a) include/asm-um/arch can't just point to include/asm-$(SUBARCH) now
 b) arch/{i386,x86_64}/crypto are merged now
 c) subarch-obj needed changes
 d) cpufeature_64.h should pull "cpufeature_32.h", not <asm/cpufeature_32.h>
    since it can be included from asm-um/cpufeature.h
 e) in case of uml-i386 we need CONFIG_X86_32 for make and gcc, but not
    for Kconfig
 f) sysctl.c shouldn't do vdso_enabled for uml-i386 (actually, that one
    should be registered from corresponding arch/*/kernel/*, with ifdef
    going away; that's a separate patch, though).

With that and with Stephen's patch ("[PATCH net-2.6] uml: hard_header fix")
we have uml allmodconfig building both on i386 and amd64.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/Makefile

@@ -176,9 +176,9 @@ include/asm-um/arch:
 	@echo '  SYMLINK $@'
 ifneq ($(KBUILD_SRC),)
 	$(Q)mkdir -p $(objtree)/include/asm-um
-	$(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
+	$(Q)ln -fsn $(srctree)/include/asm-$(HEADER_ARCH) include/asm-um/arch
 else
-	$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
+	$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(HEADER_ARCH) arch
 endif
 
 $(objtree)/$(ARCH_DIR)/include:
@@ -232,4 +232,4 @@ $(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
 	@echo '  SYMLINK $@'
 	$(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
 
-export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS
+export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH

arch/um/Makefile-i386

@@ -1,4 +1,4 @@
-core-y += arch/um/sys-i386/ arch/i386/crypto/
+core-y += arch/um/sys-i386/ arch/x86/crypto/
 
 TOP_ADDR := $(CONFIG_TOP_ADDR)
 
@@ -12,6 +12,7 @@ LDFLAGS			+= -m elf_i386
 ELF_ARCH		:= $(SUBARCH)
 ELF_FORMAT 		:= elf32-$(SUBARCH)
 OBJCOPYFLAGS  		:= -O binary -R .note -R .comment -S
+HEADER_ARCH		:= x86
 
 ifeq ("$(origin SUBARCH)", "command line")
 ifneq ("$(shell uname -m | sed -e s/i.86/i386/)", "$(SUBARCH)")
@@ -24,6 +25,11 @@ export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
 endif
 endif
 
+CFLAGS			+= -DCONFIG_X86_32
+AFLAGS			+= -DCONFIG_X86_32
+CONFIG_X86_32		:= y
+export CONFIG_X86_32
+
 ARCH_KERNEL_DEFINES += -U__$(SUBARCH)__ -U$(SUBARCH)
 
 # First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.

arch/um/Makefile-x86_64

@@ -1,7 +1,7 @@
 # Copyright 2003 - 2004 Pathscale, Inc
 # Released under the GPL
 
-core-y += arch/um/sys-x86_64/ arch/x86_64/crypto/
+core-y += arch/um/sys-x86_64/ arch/x86/crypto/
 START := 0x60000000
 
 _extra_flags_ = -fno-builtin -m64
@@ -18,6 +18,7 @@ CPPFLAGS += -m64
 
 ELF_ARCH := i386:x86-64
 ELF_FORMAT := elf64-x86-64
+HEADER_ARCH := x86
 
 # Not on all 64-bit distros /lib is a symlink to /lib64. PLD is an example.
 

arch/um/scripts/Makefile.rules

@@ -28,5 +28,5 @@ endef
 
 ifdef subarch-obj-y
 obj-y += subarch.o
-subarch-y = $(addprefix ../../$(SUBARCH)/,$(subarch-obj-y))
+subarch-y = $(addprefix ../../$(HEADER_ARCH)/,$(subarch-obj-y))
 endif

arch/um/sys-i386/Makefile

@@ -4,9 +4,9 @@ obj-y = bug.o bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
 
 obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
 
-subarch-obj-y = lib/bitops.o lib/semaphore.o lib/string.o
+subarch-obj-y = lib/bitops_32.o lib/semaphore_32.o lib/string_32.o
-subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem.o
+subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem_32.o
-subarch-obj-$(CONFIG_MODULES) += kernel/module.o
+subarch-obj-$(CONFIG_MODULES) += kernel/module_32.o
 
 USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o
 

arch/um/sys-x86_64/Makefile

@@ -11,8 +11,8 @@ obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
 obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
 obj-$(CONFIG_MODULES) += um_module.o
 
-subarch-obj-y = lib/bitops.o lib/csum-partial.o lib/memcpy.o lib/thunk.o
+subarch-obj-y = lib/bitops_64.o lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o
-subarch-obj-$(CONFIG_MODULES) += kernel/module.o
+subarch-obj-$(CONFIG_MODULES) += kernel/module_64.o
 
 ldt-y = ../sys-i386/ldt.o
 

include/asm-x86/cpufeature_64.h

@@ -7,7 +7,7 @@
 #ifndef __ASM_X8664_CPUFEATURE_H
 #define __ASM_X8664_CPUFEATURE_H
 
-#include <asm/cpufeature_32.h>
+#include "cpufeature_32.h"
 
 #undef  cpu_has_vme
 #define cpu_has_vme            0

kernel/sysctl.c

@@ -1053,7 +1053,7 @@ static ctl_table vm_table[] = {
 		.strategy	= &sysctl_string,
 	},
 #endif
-#if defined(CONFIG_X86_32) || \
+#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
 	{
 		.ctl_name	= VM_VDSO_ENABLED,