Re: [RFC v2 01/39] Kconfig: introduce HAS_IOPORT option and select it as necessary
From: "Maciej W. Rozycki" <macro@orcam.me.uk>
Date: 2022-05-01 22:40:49
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-m68k, linux-mips, linux-pci, linux-riscv, linux-sh, lkml, sparclinux
On Fri, 29 Apr 2022, 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 or where such support is optional. 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.
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diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index de3b32a507d2..4c55df08d6f1 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig@@ -47,6 +47,7 @@ config MIPS select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select GUP_GET_PTE_LOW_HIGH if CPU_MIPS32 && PHYS_ADDR_T_64BIT + select HAS_IOPORT select HAVE_ARCH_COMPILER_H select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KGDB if MIPS_FP_SUPPORT
NAK, not all MIPS systems have the port I/O space, and we have it already handled via the NO_IOPORT_MAP option. We'll need to have HAS_IOPORT set to !NO_IOPORT_MAP (or vice versa) for the MIPS architecture. Maciej