| From | Niklas Schnelle <> | Subject | [RFC 32/32] asm-generic/io.h: drop inb() etc for HAS_IOPORT=n | Date | Mon, 27 Dec 2021 17:43:17 +0100 |
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With all subsystems and drivers either declaring their dependence on HAS_IOPORT or ifdeffing I/O port specific code sections we can finally make inb()/outb() and friends compile-time dependent on HAS_IOPORT as suggested by Linus in the linked mail. The main benefit of this is that on platforms such as s390 which have no meaningful way of implementing inb()/outb() their use without the proper HAS_IOPORT dependency will result in easy to catch and fix compile-time errors instead of compiling code that can never work.
Link: https://lore.kernel.org/lkml/CAHk-=wg80je=K7madF4e7WrRNp37e3qh6y10Svhdc7O8SZ_-8g@mail.gmail.com/ Co-developed-by: Arnd Bergmann <arnd@kernel.org> Signed-off-by: Arnd Bergmann <arnd@kernel.org> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> --- include/asm-generic/io.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 7ce93aaf69f8..b2572b2eab07 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -448,6 +448,7 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer, #define IO_SPACE_LIMIT 0xffff #endif +#ifdef CONFIG_HAS_IOPORT /* * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be * implemented on hardware that needs an additional delay for I/O accesses to @@ -522,9 +523,12 @@ static inline void _outl(u32 value, unsigned long addr) __io_paw(); } #endif +#endif /* CONFIG_HAS_IOPORT */ #include <linux/logic_pio.h> +#ifdef CONFIG_HAS_IOPORT + #ifndef inb #define inb _inb #endif @@ -703,6 +707,7 @@ static inline void outsl_p(unsigned long addr, const void *buffer, outsl(addr, buffer, count); } #endif +#endif /* CONFIG_HAS_IOPORT */ #ifndef CONFIG_GENERIC_IOMAP #ifndef ioread8 -- 2.32.0
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