On 12/01/2016 03:36 AM, Andrey Ryabinin wrote:

On 11/29/2016 09:55 PM, Laura Abbott wrote:

quoted

__pa_symbol is the correct API to find the physical address of symbols.
Switch to it to allow for debugging APIs to work correctly.

But __pa() is correct for symbols. I see how __pa_symbol() might be a little
faster than __pa(), but there is nothing wrong in using __pa() on symbols.

quoted

Other
functions such as p*d_populate may call __pa internally. Ensure that the
address passed is in the linear region by calling lm_alias.

Why it should be linear mapping address? __pa() translates kernel image address just fine.
This lm_alias() only obfuscates source code. Generated code is probably worse too.

This is part of adding CONFIG_DEBUG_VIRTUAL for arm64. We want to
differentiate between __pa and __pa_symbol to enforce stronger
virtual checks and have __pa only be for linear map addresses.

Thanks,
Laura