diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 619d843ba231..9ba334908742 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1203,7 +1203,6 @@ config PCI_DIRECT
 config PCI_MMCONFIG
 	bool
 	depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
-	select ACPI_BOOT
 	default y
 
 source "drivers/pci/pcie/Kconfig"
diff --git a/arch/i386/defconfig b/arch/i386/defconfig
index ca07b95c06b8..1c0076e22dda 100644
--- a/arch/i386/defconfig
+++ b/arch/i386/defconfig
@@ -131,7 +131,6 @@ CONFIG_SOFTWARE_SUSPEND=y
 # ACPI (Advanced Configuration and Power Interface) Support
 #
 CONFIG_ACPI=y
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_SLEEP=y
 CONFIG_ACPI_SLEEP_PROC_FS=y
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index 4cc83b322b36..c52b4fad011b 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -11,7 +11,7 @@ obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
 
 obj-y				+= cpu/
 obj-y				+= timers/
-obj-$(CONFIG_ACPI_BOOT)		+= acpi/
+obj-$(CONFIG_ACPI)		+= acpi/
 obj-$(CONFIG_X86_BIOS_REBOOT)	+= reboot.o
 obj-$(CONFIG_MCA)		+= mca.o
 obj-$(CONFIG_X86_MSR)		+= msr.o
diff --git a/arch/i386/kernel/acpi/Makefile b/arch/i386/kernel/acpi/Makefile
index 5e291a20c03d..267ca48e1b6c 100644
--- a/arch/i386/kernel/acpi/Makefile
+++ b/arch/i386/kernel/acpi/Makefile
@@ -1,4 +1,4 @@
-obj-$(CONFIG_ACPI_BOOT)		:= boot.o
+obj-y				:= boot.o
 obj-$(CONFIG_X86_IO_APIC)	+= earlyquirk.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o
 
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 6578f40bd501..ebedd2e21670 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -2421,7 +2421,7 @@ device_initcall(ioapic_init_sysfs);
                           ACPI-based IOAPIC Configuration
    -------------------------------------------------------------------------- */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 int __init io_apic_get_unique_id (int ioapic, int apic_id)
 {
@@ -2574,4 +2574,4 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
 	return 0;
 }
 
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_ACPI */
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index ce838abb27d8..9a4db7d30001 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -653,8 +653,6 @@ void __init get_smp_config (void)
 	struct intel_mp_floating *mpf = mpf_found;
 
 	/*
-	 * ACPI may be used to obtain the entire SMP configuration or just to 
-	 * enumerate/configure processors (CONFIG_ACPI_BOOT).  Note that 
 	 * ACPI supports both logical (e.g. Hyper-Threading) and physical 
 	 * processors, where MPS only supports physical.
 	 */
@@ -810,7 +808,7 @@ void __init find_smp_config (void)
                             ACPI-based MP Configuration
    -------------------------------------------------------------------------- */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 void __init mp_register_lapic_address (
 	u64			address)
@@ -856,7 +854,7 @@ void __init mp_register_lapic (
 	MP_processor_info(&processor);
 }
 
-#if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_ACPI_BOOT))
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
 
 #define MP_ISA_BUS		0
 #define MP_MAX_IOAPIC_PIN	127
@@ -1138,5 +1136,5 @@ int mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
 	return gsi;
 }
 
-#endif /*CONFIG_X86_IO_APIC && (CONFIG_ACPI_INTERPRETER || CONFIG_ACPI_BOOT)*/
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_X86_IO_APIC && CONFIG_ACPI_INTERPRETER */
+#endif /* CONFIG_ACPI */
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index af4de58cab54..d3943e5edc8f 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -94,7 +94,7 @@ unsigned long mmu_cr4_features;
 #endif
 EXPORT_SYMBOL(acpi_disabled);
 
-#ifdef	CONFIG_ACPI_BOOT
+#ifdef	CONFIG_ACPI
 int __initdata acpi_force = 0;
 extern acpi_interrupt_flags	acpi_sci_flags;
 #endif
@@ -794,7 +794,7 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 		}
 #endif
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 		/* "acpi=off" disables both ACPI table parsing and interpreter */
 		else if (!memcmp(from, "acpi=off", 8)) {
 			disable_acpi();
@@ -850,7 +850,7 @@ static void __init parse_cmdline_early (char ** cmdline_p)
 		else if (!memcmp(from, "noapic", 6))
 			disable_ioapic_setup();
 #endif /* CONFIG_X86_LOCAL_APIC */
-#endif /* CONFIG_ACPI_BOOT */
+#endif /* CONFIG_ACPI */
 
 #ifdef CONFIG_X86_LOCAL_APIC
 		/* enable local APIC */
@@ -1575,7 +1575,7 @@ void __init setup_arch(char **cmdline_p)
 	if (efi_enabled)
 		efi_map_memmap();
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
diff --git a/arch/i386/mach-es7000/es7000plat.c b/arch/i386/mach-es7000/es7000plat.c
index d5936d500479..baac9da042ce 100644
--- a/arch/i386/mach-es7000/es7000plat.c
+++ b/arch/i386/mach-es7000/es7000plat.c
@@ -51,7 +51,7 @@ struct mip_reg		*host_reg;
 int 			mip_port;
 unsigned long		mip_addr, host_addr;
 
-#if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_ACPI_BOOT))
+#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_ACPI_INTERPRETER)
 
 /*
  * GSI override for ES7000 platforms.
@@ -73,7 +73,7 @@ es7000_rename_gsi(int ioapic, int gsi)
 	return gsi;
 }
 
-#endif // (CONFIG_X86_IO_APIC) && (CONFIG_ACPI_INTERPRETER || CONFIG_ACPI_BOOT)
+#endif // (CONFIG_X86_IO_APIC) && (CONFIG_ACPI_INTERPRETER)
 
 /*
  * Parse the OEM Table
diff --git a/arch/ia64/configs/bigsur_defconfig b/arch/ia64/configs/bigsur_defconfig
index b95fcf86ea00..456c65689bef 100644
--- a/arch/ia64/configs/bigsur_defconfig
+++ b/arch/ia64/configs/bigsur_defconfig
@@ -107,7 +107,6 @@ CONFIG_ACPI=y
 #
 # ACPI (Advanced Configuration and Power Interface) Support
 #
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_BUTTON=m
 CONFIG_ACPI_VIDEO=m
diff --git a/arch/ia64/configs/sn2_defconfig b/arch/ia64/configs/sn2_defconfig
index dccf35c60b94..dc483c18343f 100644
--- a/arch/ia64/configs/sn2_defconfig
+++ b/arch/ia64/configs/sn2_defconfig
@@ -130,7 +130,6 @@ CONFIG_ACPI=y
 #
 # ACPI (Advanced Configuration and Power Interface) Support
 #
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 # CONFIG_ACPI_BUTTON is not set
 CONFIG_ACPI_VIDEO=m
diff --git a/arch/ia64/configs/tiger_defconfig b/arch/ia64/configs/tiger_defconfig
index c853cfcd2d11..cd2d6375a853 100644
--- a/arch/ia64/configs/tiger_defconfig
+++ b/arch/ia64/configs/tiger_defconfig
@@ -128,7 +128,6 @@ CONFIG_ACPI=y
 #
 # ACPI (Advanced Configuration and Power Interface) Support
 #
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_BUTTON=m
 # CONFIG_ACPI_VIDEO is not set
diff --git a/arch/ia64/configs/zx1_defconfig b/arch/ia64/configs/zx1_defconfig
index 88e8867fa8e8..cf58404769a8 100644
--- a/arch/ia64/configs/zx1_defconfig
+++ b/arch/ia64/configs/zx1_defconfig
@@ -128,7 +128,6 @@ CONFIG_ACPI=y
 #
 # ACPI (Advanced Configuration and Power Interface) Support
 #
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_BUTTON=y
 CONFIG_ACPI_VIDEO=m
diff --git a/arch/ia64/defconfig b/arch/ia64/defconfig
index 8444add76380..f38c677f7afd 100644
--- a/arch/ia64/defconfig
+++ b/arch/ia64/defconfig
@@ -118,7 +118,6 @@ CONFIG_ACPI=y
 #
 # ACPI (Advanced Configuration and Power Interface) Support
 #
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_BUTTON=m
 CONFIG_ACPI_VIDEO=m
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 78bc21987121..318787c84ac0 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -132,7 +132,7 @@ const char *acpi_get_sysname(void)
 #endif
 }
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 #define ACPI_MAX_PLATFORM_INTERRUPTS	256
 
@@ -917,4 +917,4 @@ int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 
 EXPORT_SYMBOL(acpi_unregister_ioapic);
 
-#endif				/* CONFIG_ACPI_BOOT */
+#endif				/* CONFIG_ACPI */
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 84f89da7c640..1f5c26dbe705 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -384,7 +384,7 @@ setup_arch (char **cmdline_p)
 	if (early_console_setup(*cmdline_p) == 0)
 		mark_bsp_online();
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	/* Initialize the ACPI boot-time table parser */
 	acpi_table_init();
 # ifdef CONFIG_ACPI_NUMA
@@ -420,7 +420,7 @@ setup_arch (char **cmdline_p)
 
 	cpu_init();	/* initialize the bootstrap CPU */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	acpi_boot_init();
 #endif
 
diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index 92ff46ad21e2..706b7734e191 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -36,7 +36,7 @@ int arch_register_cpu(int num)
 	parent = &sysfs_nodes[cpu_to_node(num)];
 #endif /* CONFIG_NUMA */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	/*
 	 * If CPEI cannot be re-targetted, and this is
 	 * CPEI target, then dont create the control file
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 660a03a89e66..40242c61e90a 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -144,7 +144,6 @@ config X86_CPUID
 	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 	  /dev/cpu/31/cpuid.
 
-# disable it for opteron optimized builds because it pulls in ACPI_BOOT
 config X86_HT
 	bool
 	depends on SMP && !MK8
@@ -461,7 +460,6 @@ config PCI_DIRECT
 config PCI_MMCONFIG
 	bool "Support mmconfig PCI config space access"
 	depends on PCI && ACPI
-	select ACPI_BOOT
 
 config UNORDERED_IO
        bool "Unordered IO mapping access"
diff --git a/arch/x86_64/defconfig b/arch/x86_64/defconfig
index 776f3c866b70..aed77c1c5ccc 100644
--- a/arch/x86_64/defconfig
+++ b/arch/x86_64/defconfig
@@ -135,7 +135,6 @@ CONFIG_PM_STD_PARTITION=""
 # ACPI (Advanced Configuration and Power Interface) Support
 #
 CONFIG_ACPI=y
-CONFIG_ACPI_BOOT=y
 CONFIG_ACPI_INTERPRETER=y
 CONFIG_ACPI_AC=y
 CONFIG_ACPI_BATTERY=y
diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index 48f9e2c19cd6..0296ca6cbfa3 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -12,7 +12,7 @@ obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o \
 obj-$(CONFIG_X86_MCE)         += mce.o
 obj-$(CONFIG_X86_MCE_INTEL)	+= mce_intel.o
 obj-$(CONFIG_MTRR)		+= ../../i386/kernel/cpu/mtrr/
-obj-$(CONFIG_ACPI_BOOT)		+= acpi/
+obj-$(CONFIG_ACPI)		+= acpi/
 obj-$(CONFIG_X86_MSR)		+= msr.o
 obj-$(CONFIG_MICROCODE)		+= microcode.o
 obj-$(CONFIG_X86_CPUID)		+= cpuid.o
diff --git a/arch/x86_64/kernel/acpi/Makefile b/arch/x86_64/kernel/acpi/Makefile
index d2c2ee5f9a88..7da9ace890bd 100644
--- a/arch/x86_64/kernel/acpi/Makefile
+++ b/arch/x86_64/kernel/acpi/Makefile
@@ -1,3 +1,3 @@
-obj-$(CONFIG_ACPI_BOOT)		:= boot.o
-boot-$(CONFIG_ACPI_BOOT)	:= ../../../i386/kernel/acpi/boot.o
+obj-y			:= boot.o
+boot-y			:= ../../../i386/kernel/acpi/boot.o
 obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup.o
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index d206d7e49cf5..1013a8fe44d7 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1841,7 +1841,7 @@ device_initcall(ioapic_init_sysfs);
                           ACPI-based IOAPIC Configuration
    -------------------------------------------------------------------------- */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 #define IO_APIC_MAX_ID		0xFE
 
@@ -1923,7 +1923,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
 	return 0;
 }
 
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_ACPI */
 
 
 /*
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 79c362d03e2e..86445f320d86 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -74,7 +74,7 @@ static unsigned int num_processors = 0;
 physid_mask_t phys_cpu_present_map = PHYSID_MASK_NONE;
 
 /* ACPI MADT entry parsing functions */
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern struct acpi_boot_flags acpi_boot;
 #ifdef CONFIG_X86_LOCAL_APIC
 extern int acpi_parse_lapic (acpi_table_entry_header *header);
@@ -84,7 +84,7 @@ extern int acpi_parse_lapic_nmi (acpi_table_entry_header *header);
 #ifdef CONFIG_X86_IO_APIC
 extern int acpi_parse_ioapic (acpi_table_entry_header *header);
 #endif /*CONFIG_X86_IO_APIC*/
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /*CONFIG_ACPI*/
 
 u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
 
@@ -519,8 +519,6 @@ void __init get_smp_config (void)
 	struct intel_mp_floating *mpf = mpf_found;
 
 	/*
- 	 * ACPI may be used to obtain the entire SMP configuration or just to 
- 	 * enumerate/configure processors (CONFIG_ACPI_BOOT).  Note that 
  	 * ACPI supports both logical (e.g. Hyper-Threading) and physical 
  	 * processors, where MPS only supports physical.
  	 */
@@ -673,7 +671,7 @@ void __init find_smp_config (void)
                             ACPI-based MP Configuration
    -------------------------------------------------------------------------- */
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 void __init mp_register_lapic_address (
 	u64			address)
@@ -994,4 +992,4 @@ int mp_register_gsi(u32 gsi, int edge_level, int active_high_low)
 }
 
 #endif /*CONFIG_X86_IO_APIC*/
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /*CONFIG_ACPI*/
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 116a491e2961..cfcebc8ab7b4 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -71,7 +71,7 @@ unsigned long mmu_cr4_features;
 
 int acpi_disabled;
 EXPORT_SYMBOL(acpi_disabled);
-#ifdef	CONFIG_ACPI_BOOT
+#ifdef	CONFIG_ACPI
 extern int __initdata acpi_ht;
 extern acpi_interrupt_flags	acpi_sci_flags;
 int __initdata acpi_force = 0;
@@ -294,7 +294,7 @@ static __init void parse_cmdline_early (char ** cmdline_p)
 			maxcpus = simple_strtoul(from + 8, NULL, 0);
 		}
 #endif
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 		/* "acpi=off" disables both ACPI table parsing and interpreter init */
 		if (!memcmp(from, "acpi=off", 8))
 			disable_acpi();
@@ -566,7 +566,7 @@ void __init setup_arch(char **cmdline_p)
 
 	init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	/*
 	 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
 	 * Call this early for SRAT node setup.
@@ -658,7 +658,7 @@ void __init setup_arch(char **cmdline_p)
 
 	check_ioapic();
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	/*
 	 * Read APIC and some other early information from ACPI tables.
 	 */
diff --git a/drivers/Makefile b/drivers/Makefile
index 126a851d5653..784b93c8888d 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -8,7 +8,7 @@
 obj-$(CONFIG_PCI)		+= pci/
 obj-$(CONFIG_PARISC)		+= parisc/
 obj-y				+= video/
-obj-$(CONFIG_ACPI_BOOT)		+= acpi/
+obj-$(CONFIG_ACPI)		+= acpi/
 # PnP must come after ACPI since it will eventually need to check if acpi
 # was used and do nothing if so
 obj-$(CONFIG_PNP)		+= pnp/
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 66c60982ba46..14b70c259f3e 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -43,10 +43,6 @@ config ACPI
 
 if ACPI
 
-config ACPI_BOOT
-	bool
-	default y
-
 config ACPI_INTERPRETER
 	bool
 	default y
@@ -312,7 +308,7 @@ endif	# ACPI_INTERPRETER
 config X86_PM_TIMER
 	bool "Power Management Timer Support"
 	depends on X86
-	depends on ACPI_BOOT && EXPERIMENTAL
+	depends on EXPERIMENTAL
 	depends on !X86_64
 	default n
 	help
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index ad67e8f61e6c..952ab352af9e 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -15,7 +15,7 @@ EXTRA_CFLAGS	+= $(ACPI_CFLAGS)
 #
 # ACPI Boot-Time Table Parsing
 #
-obj-$(CONFIG_ACPI_BOOT)		+= tables.o
+obj-y				+= tables.o
 obj-$(CONFIG_ACPI_INTERPRETER)	+= blacklist.o
 
 #
diff --git a/include/asm-i386/acpi.h b/include/asm-i386/acpi.h
index cf828ace13f9..1f1ade923d69 100644
--- a/include/asm-i386/acpi.h
+++ b/include/asm-i386/acpi.h
@@ -103,7 +103,7 @@ __acpi_release_global_lock (unsigned int *lock)
         :"=r"(n_hi), "=r"(n_lo)     \
         :"0"(n_hi), "1"(n_lo))
 
-#ifdef CONFIG_ACPI_BOOT 
+#ifdef CONFIG_ACPI 
 extern int acpi_lapic;
 extern int acpi_ioapic;
 extern int acpi_noirq;
@@ -146,7 +146,7 @@ static inline void check_acpi_pci(void) { }
 
 #endif
 
-#else	/* CONFIG_ACPI_BOOT */
+#else	/* !CONFIG_ACPI */
 #  define acpi_lapic 0
 #  define acpi_ioapic 0
 
diff --git a/include/asm-i386/fixmap.h b/include/asm-i386/fixmap.h
index c94cac958389..cfb1c61d3b9c 100644
--- a/include/asm-i386/fixmap.h
+++ b/include/asm-i386/fixmap.h
@@ -76,7 +76,7 @@ enum fixed_addresses {
 	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
 	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
 #endif
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 	FIX_ACPI_BEGIN,
 	FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
 #endif
diff --git a/include/asm-i386/io_apic.h b/include/asm-i386/io_apic.h
index 002c203ccd6a..51c4e5fe6062 100644
--- a/include/asm-i386/io_apic.h
+++ b/include/asm-i386/io_apic.h
@@ -195,12 +195,12 @@ extern int skip_ioapic_setup;
  */
 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern int io_apic_get_unique_id (int ioapic, int apic_id);
 extern int io_apic_get_version (int ioapic);
 extern int io_apic_get_redir_entries (int ioapic);
 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_ACPI */
 
 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
 
diff --git a/include/asm-i386/mpspec.h b/include/asm-i386/mpspec.h
index d9fafba075bc..b9e9f66d2721 100644
--- a/include/asm-i386/mpspec.h
+++ b/include/asm-i386/mpspec.h
@@ -26,14 +26,14 @@ extern unsigned long mp_lapic_addr;
 extern int pic_mode;
 extern int using_apic_timer;
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern void mp_register_lapic (u8 id, u8 enabled);
 extern void mp_register_lapic_address (u64 address);
 extern void mp_register_ioapic (u8 id, u32 address, u32 gsi_base);
 extern void mp_override_legacy_irq (u8 bus_irq, u8 polarity, u8 trigger, u32 gsi);
 extern void mp_config_acpi_legacy_irqs (void);
 extern int mp_register_gsi (u32 gsi, int edge_level, int active_high_low);
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_ACPI */
 
 #define PHYSID_ARRAY_SIZE	BITS_TO_LONGS(MAX_APICS)
 
diff --git a/include/asm-x86_64/acpi.h b/include/asm-x86_64/acpi.h
index dc8c981af27f..7d537e1867c7 100644
--- a/include/asm-x86_64/acpi.h
+++ b/include/asm-x86_64/acpi.h
@@ -101,7 +101,7 @@ __acpi_release_global_lock (unsigned int *lock)
         :"=r"(n_hi), "=r"(n_lo)     \
         :"0"(n_hi), "1"(n_lo))
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern int acpi_lapic;
 extern int acpi_ioapic;
 extern int acpi_noirq;
@@ -122,10 +122,10 @@ static inline void disable_acpi(void)
 
 extern int acpi_gsi_to_irq(u32 gsi, unsigned int *irq);
 
-#else	/* !CONFIG_ACPI_BOOT */
+#else	/* !CONFIG_ACPI */
 #define acpi_lapic 0
 #define acpi_ioapic 0
-#endif /* !CONFIG_ACPI_BOOT */
+#endif /* !CONFIG_ACPI */
 
 extern int acpi_numa;
 extern int acpi_scan_nodes(unsigned long start, unsigned long end);
diff --git a/include/asm-x86_64/io_apic.h b/include/asm-x86_64/io_apic.h
index a8babd2bbe84..ee1bc69aec9c 100644
--- a/include/asm-x86_64/io_apic.h
+++ b/include/asm-x86_64/io_apic.h
@@ -201,7 +201,7 @@ extern int skip_ioapic_setup;
  */
 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern int io_apic_get_version (int ioapic);
 extern int io_apic_get_redir_entries (int ioapic);
 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int, int);
diff --git a/include/asm-x86_64/mpspec.h b/include/asm-x86_64/mpspec.h
index 331f6a3c72a2..f267e10c023d 100644
--- a/include/asm-x86_64/mpspec.h
+++ b/include/asm-x86_64/mpspec.h
@@ -179,7 +179,7 @@ extern int mpc_default_type;
 extern unsigned long mp_lapic_addr;
 extern int pic_mode;
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 extern void mp_register_lapic (u8 id, u8 enabled);
 extern void mp_register_lapic_address (u64 address);
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index fd48db320f5b..fa1ad1a60a09 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -41,7 +41,7 @@
 #include <asm/acpi.h>
 
 
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
 
 enum acpi_irq_model_id {
 	ACPI_IRQ_MODEL_PIC = 0,
@@ -429,11 +429,11 @@ extern int pci_mmcfg_config_num;
 
 extern int sbf_port ;
 
-#else	/*!CONFIG_ACPI_BOOT*/
+#else	/* !CONFIG_ACPI */
 
 #define acpi_mp_config	0
 
-#endif 	/*!CONFIG_ACPI_BOOT*/
+#endif 	/* !CONFIG_ACPI */
 
 int acpi_register_gsi (u32 gsi, int edge_level, int active_high_low);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);