[PATCH 08/10] arch: introduce strict_ioremap
From: Dan Williams <hidden>
Date: 2015-07-20 00:24:26
Also in:
linux-arch, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
In preparation for enabling memremap(), add support for strict mappings. strict_ioremap_<type>() returns NULL if the arch does not implement the mapping type, rather than falling back silently to ioremap(). Signed-off-by: Dan Williams <redacted> --- include/linux/io.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/include/linux/io.h b/include/linux/io.h
index 58482241c95c..080a4fbf2ba4 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h@@ -130,6 +130,27 @@ static inline void __iomem *ioremap_uc(resource_size_t offset, } #endif +static inline void __iomem *strict_ioremap_cache(resource_size_t offset, + unsigned long size) +{ +#ifdef ioremap_cache + return ioremap_cache(offset, size); +#else + return (void __force __iomem *) NULL; +#endif +} + +static inline void __iomem *strict_ioremap_wt(resource_size_t offset, + unsigned long size) +{ +#ifdef ioremap_wt + return ioremap_wt(offset, size); +#else + return (void __force __iomem *) NULL; +#endif +} + + /* * Some systems do not have legacy ISA devices. * /dev/port is not a valid interface on these systems.