In preparation for removing ioremap_cache() introduce arch_memremap()
for sh. This simply enforces that attempts to establish writethrough
mappings fail rather than silently fallback to uncached.
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
arch/sh/Kconfig | 1 +
arch/sh/mm/ioremap.c | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d514df7e04dd..b5801ae0e952 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -54,6 +54,7 @@ config SUPERH32
def_bool ARCH = "sh"
select HAVE_KPROBES
select HAVE_KRETPROBES
+ select ARCH_HAS_MEMREMAP
select HAVE_IOREMAP_PROT if MMU && !X2TLB
select HAVE_FUNCTION_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index 0c99ec2e7ed8..ce3819273368 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -86,6 +86,15 @@ __ioremap_caller(phys_addr_t phys_addr, unsigned long size,
}
EXPORT_SYMBOL(__ioremap_caller);
+void *arch_memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+ if ((flags & MEMREMAP_WB) == 0)
+ return NULL;
+
+ return (void __force *) __ioremap_mode(offset, size, PAGE_KERNEL);
+}
+EXPORT_SYMBOL(arch_memremap);
+
/*
* Simple checks for non-translatable mappings.
*/
--
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