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Kconfig: introduce HAS_IOPORT option and select it as necessary

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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: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net> # for ARCH=um
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Niklas Schnelle
2023-03-23 17:33:52 +01:00
committed by Arnd Bergmann
parent fe15c26ee2
commit fcbfe8121a
17 changed files with 20 additions and 1 deletions
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1
arch/alpha/Kconfig
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@@ -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