Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

[Kevin Brodsky]

On 31/07/2019 17:50, Dave Hansen wrote:
> On 7/23/19 10:58 AM, Andrey Konovalov wrote:
> > The mmap and mremap (only new_addr) syscalls do not currently accept
> > tagged addresses. Architectures may interpret the tag as a background
> > colour for the corresponding vma.
> What the heck is a "background colour"? :)

Good point, this is some jargon that we started using for MTE, the idea being that 
the kernel could set a tag value (specified during mmap()) as "background colour" for 
anonymous pages allocated in that range.

Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's 
best to drop this last sentence to avoid any confusion.

Kevin