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asm-generic/io.h: check CONFIG_VIRT_TO_BUS

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Make asm-generic/io.h check CONFIG_VIRT_TO_BUS before defining
virt_to_bus() and bus_to_virt(), otherwise it's easy to accidentally
have a silently failing incorrect direct mapped definition rather then
no definition at all.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
James Hogan 2012-11-23 16:13:05 +00:00
parent 19f949f525
commit c93d031231
1 changed files with 2 additions and 0 deletions
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include/asm-generic/io.h
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@ -332,6 +332,7 @@ extern void ioport_unmap(void __iomem *p);
#define xlate_dev_kmem_ptr(p) p
#define xlate_dev_mem_ptr(p) __va(p)
#ifdef CONFIG_VIRT_TO_BUS
#ifndef virt_to_bus
static inline unsigned long virt_to_bus(volatile void *address)
{
@ -343,6 +344,7 @@ static inline void *bus_to_virt(unsigned long address)
return (void *) address;
}
#endif
#endif
#ifndef memset_io
#define memset_io(a, b, c) memset(__io_virt(a), (b), (c))