On Tue, Mar 14, 2023, at 13:11, Niklas Schnelle wrote:
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. Also
add dependencies on HAS_IOPORT for the ISA and HAVE_EISA config options
as these busses always go along with HAS_IOPORT.
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.
I think it would be helpful to enumerate which architectures
do not get HAS_IOPORT added, as they will be affected more.
Co-developed-by: Arnd Bergmann <arnd@xxxxxxxxxx>
Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
If there are no objections, I could send this first patch for the
asm-generic tree as a preparation for 6.3, so we are able to merge
the other patches through subsystem maintainer tree for 6.4.
arch/loongarch/ will now also need to select HAS_IOPORT
uncontitionally, this architecture was added after you
sent v2.
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index a98940e64243..5eeacc72e4da 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -47,6 +47,7 @@ config PARISC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
select TTY # Needed for pdc_cons.c
+ select HAS_IOPORT if PCI
It's also needed for EISA and I think you should select it
from CONFIG_GSC in drivers/parisc/Kconfig for this purpose.
This could also be 'select HAS_IOPORT if PCI || EISA', but
that would require removing the 'depends on HAS_IOPORT'
under drivers/eisa/.
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HASH
@@ -131,6 +132,7 @@ config STACKTRACE_SUPPORT
config ISA_DMA_API
bool
+ depends on HAS_IOPORT
This line is not really needed since there is no way to
enable ISA_DMA_API.
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a6c4407d3ec8..f7de646c074a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -188,6 +188,7 @@ config PPC
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select GENERIC_VDSO_TIME_NS
+ select HAS_IOPORT if PCI
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMALLOC if HAVE_ARCH_HUGE_VMAP
select HAVE_ARCH_HUGE_VMAP if PPC_RADIX_MMU || PPC_8xx
@@ -1070,7 +1071,6 @@ menu "Bus options"
config ISA
bool "Support for ISA-bus hardware"
- depends on PPC_CHRP
select PPC_I8259
help
Find out whether you have ISA slots on your motherboard. ISA is the
This line looks wrong, I think we should keep that dependency.
Did you get a circular dependency if you leave it in?
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a825bf031f49..634dd42532f3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -162,6 +162,7 @@ config X86
select GUP_GET_PXX_LOW_HIGH if X86_PAE
select HARDIRQS_SW_RESEND
select HARDLOCKUP_CHECK_TIMESTAMP if X86_64
+ select HAS_IOPORT
select HAVE_ACPI_APEI if ACPI
select HAVE_ACPI_APEI_NMI if ACPI
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
@@ -2893,6 +2894,7 @@ if X86_32
config ISA
bool "ISA support"
+ depends on HAS_IOPORT
help
HAS_IOPORT is selected unconditionally already, so this doesn't
really do anything.
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 3b9a44008433..c68e4d9dcecb 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -121,7 +121,8 @@ config KDB_DEFAULT_ENABLE
config KDB_KEYBOARD
bool "KGDB_KDB: keyboard as input device"
- depends on VT && KGDB_KDB && !PARISC
+ depends on HAS_IOPORT
+ depends on VT && KGDB_KDB
default n
This loses the !PARISC dependency, which I don't think is
intentional. The added HAS_IOPORT dependency makes sense
here, but I think this should be in a different patch
and not in the preparation.
Arnd
