On 8/1/19 5:48 AM, Andrey Konovalov wrote:
On Thu, Aug 1, 2019 at 2:11 PM Kevin Brodsky kevin.brodsky@arm.com wrote:
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.
Sure, thanks!
OK, but what does that mean for tagged addresses getting passed to mmap/mremap? That sentence read to me like "architectures might allow tags for ...something...". So do we accept tagged addresses into those syscalls?