Is it safe to use copy_to_user on a __iomem pointer returned by ioremap?

[orback]

Hi,

I am currently writing a device driver and i wounder if it is safe to use copy_to_user on an __iomem pointer return by ioremap()? Or do I have to copy with memcpy_fromio() to an kmalloced buffer in the driver first and then copy_to_user?

Thanks

[zhangyd6]

Hi,

I am currently writing a device driver and i wounder if it is safe to use copy_to_user on an __iomem pointer return by ioremap()? Or do I have to copy with memcpy_fromio() to an kmalloced buffer in the driver first and then copy_to_user?

Thanks

which architechture did you use, x86 arm or power. In x86 architechture it is safe to use copy_to_user, and ARM is OK tool