Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

[Dave Hansen]

On 06/23/2014 01:06 PM, Andy Lutomirski wrote:
> Can the new vm_operation "name" be use for this?  The magic "always
> written to core dumps" feature might need to be reconsidered.

One thing I'd like to avoid is an MPX vma getting merged with a non-MPX
vma.  I don't see any code to prevent two VMAs with different
vm_ops->names from getting merged.  That seems like a bit of a design
oversight for ->name.  Right?

Thinking out loud a bit... There are also some more complicated but more
performant cleanup mechanisms that I'd like to go after in the future.
Given a page, we might want to figure out if it is an MPX page or not.
I wonder if we'll ever collide with some other user of vm_ops->name.  It
looks fairly narrowly used at the moment, but would this keep us from
putting these pages on, say, a tmpfs mount?  Doesn't look that way at
the moment.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/