Unverified Commit fcbfe812 authored by Niklas Schnelle's avatar Niklas Schnelle Committed by Arnd Bergmann
Browse files

Kconfig: introduce HAS_IOPORT option and select it as necessary 



We introduce a new HAS_IOPORT Kconfig option to indicate support for I/O
Port access. In a future patch HAS_IOPORT=n will disable compilation of
the I/O accessor functions inb()/outb() and friends on architectures
which can not meaningfully support legacy I/O spaces such as s390.

The following architectures do not select HAS_IOPORT:

* ARC
* C-SKY
* Hexagon
* Nios II
* OpenRISC
* s390
* User-Mode Linux
* Xtensa

All other architectures select HAS_IOPORT at least conditionally.

The "depends on" relations on HAS_IOPORT in drivers as well as ifdefs
for HAS_IOPORT specific sections will be added in subsequent patches on
a per subsystem basis.

Co-developed-by: default avatarArnd Bergmann <arnd@kernel.org>
Signed-off-by: default avatarArnd Bergmann <arnd@kernel.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net> # for ARCH=um
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent fe15c26e

arch/alpha/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ config ALPHA 
	select AUDIT_ARCH

	select GENERIC_CPU_VULNERABILITIES

	select GENERIC_SMP_IDLE_THREAD

	select HAS_IOPORT

	select HAVE_ARCH_AUDITSYSCALL

	select HAVE_MOD_ARCH_SPECIFIC

	select MODULES_USE_ELF_RELA

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ config ARM 
	select GENERIC_SCHED_CLOCK

	select GENERIC_SMP_IDLE_THREAD

	select HARDIRQS_SW_RESEND

	select HAS_IOPORT

	select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT

	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6

	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -145,6 +145,7 @@ config ARM64 
	select GENERIC_GETTIMEOFDAY

	select GENERIC_VDSO_TIME_NS

	select HARDIRQS_SW_RESEND

	select HAS_IOPORT

	select HAVE_MOVE_PMD

	select HAVE_MOVE_PUD

	select HAVE_PCI

arch/ia64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ config IA64 
	select PCI_DOMAINS if PCI

	select PCI_MSI

	select PCI_SYSCALL if PCI

	select HAS_IOPORT

	select HAVE_ASM_MODVERSIONS

	select HAVE_UNSTABLE_SCHED_CLOCK

	select HAVE_EXIT_THREAD

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ config LOONGARCH 
	select GENERIC_SMP_IDLE_THREAD

	select GENERIC_TIME_VSYSCALL

	select GPIOLIB

	select HAS_IOPORT

	select HAVE_ARCH_AUDITSYSCALL

	select HAVE_ARCH_MMAP_RND_BITS if MMU

	select HAVE_ARCH_SECCOMP_FILTER