On 6/26/2017 2:43 PM, Arnd Bergmann wrote:
This hardcodes the behavior of include/linux/io-64-nonatomic-hi-lo.h, which
I find rather confusing, as only about one in five drivers wants this
behavior.
I'd suggest you don't add it in lib/iomap.c at all for 32-bit architectures,
but rather use the
> +u64 ioread64(void __iomem *addr)
> +{
> + u64 low, high;
> +
> + low = ioread32(addr);
> + high = ioread32(addr + sizeof(u32));
> + return low | (high << 32);
> +}
> +u64 ioread64be(void __iomem *addr)
> +{
> + u64 low, high;
> +
> + low = ioread32be(addr +
Currently, ioread64 and iowrite64 are not impleminted in the generic
iomap implementation. The prototypes are defined if CONFIG_64BIT is set
but there is no actual implementation.
Seeing the functions are not universally available, they are unusable
for driver developers. This leads to ugly hacks
