[RFC PATCH 6/6] arch: add untagged_addr definition for other arches

Andrey Konovalov andreyknvl at google.com
Sat Mar 10 02:47:23 AEDT 2018

On Fri, Mar 9, 2018 at 3:16 PM, Robin Murphy <robin.murphy at arm.com> wrote:
> On 09/03/18 14:02, Andrey Konovalov wrote:
>> To allow arm64 syscalls accept tagged pointers from userspace, we must
>> untag them when they are passed to the kernel. Since untagging is done in
>> generic parts of the kernel (like the mm subsystem), the untagged_addr
>> macro should be defined for all architectures.
> Would it not suffice to have an "#ifndef untagged_addr..." fallback in
> linux/uaccess.h?

Hi Robin!

This approach is much better, I'll try it. This will also solve the
merge issues that Arnd mentioned.


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