ARM: provide runtime hook for ioremap/iounmap
We have compile time over-ride of ioremap and iounmap, but an run-time
override is needed for multi-platform builds. This adds an extra function
pointer check, but ioremap is not peformance critical. The option for
compile time selection remains.
The caller variant is used here to provide correct caller information as
ARM can only support level 0 for __builtin_return_address.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 80632e8..0246290 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -306,11 +306,15 @@
}
EXPORT_SYMBOL(__arm_ioremap_pfn);
+void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
+ unsigned int, void *) =
+ __arm_ioremap_caller;
+
void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
- return __arm_ioremap_caller(phys_addr, size, mtype,
- __builtin_return_address(0));
+ return arch_ioremap_caller(phys_addr, size, mtype,
+ __builtin_return_address(0));
}
EXPORT_SYMBOL(__arm_ioremap);
@@ -369,4 +373,11 @@
vunmap(addr);
}
-EXPORT_SYMBOL(__iounmap);
+
+void (*arch_iounmap)(volatile void __iomem *) = __iounmap;
+
+void __arm_iounmap(volatile void __iomem *io_addr)
+{
+ arch_iounmap(io_addr);
+}
+EXPORT_SYMBOL(__arm_iounmap);