On Thu, 13 Mar 2025 13:54:39 +1100 Andrew Donnellan [off-list ref] wrote:

On Wed, 2025-02-12 at 03:13 +1100, Andrew Donnellan wrote:

quoted

Support page table check on all PowerPC platforms. This works by
serialising assignments, reassignments and clears of page table
entries at each level in order to ensure that anonymous mappings
have at most one writable consumer, and likewise that file-backed
mappings are not simultaneously also anonymous mappings.

In order to support this infrastructure, a number of stubs must be
defined for all powerpc platforms. Additionally, seperate
set_pte_at()
and set_pte_at_unchecked(), to allow for internal, uninstrumented
mappings.

Talking to Maddy about this off-list - given that this series touches
on generic code and several architectures, would it be best to take it
through the mm tree rather than powerpc?

Sure, I can do that.

Are the rest of the ppc team OK with these changes?  I'm not seeing
much acking from the usual suspects?