12 Aug
2025
12 Aug
'25
4:08 p.m.
On Tue, Aug 12, 2025 at 06:53:49PM +0900, Harry Yoo wrote:
I'd add that arm handles PGTBL_PMD_MODIFIED and therefore remains unaffected just to be super clear.
Will do:
This change currently targets only x86_64, so only PGD and P4D level helpers are introduced. Currently, these helpers are no-ops since no architecture sets PGTBL_{PGD,P4D}_MODIFIED in ARCH_PAGE_TABLE_SYNC_MASK.
In theory, PUD and PMD level helpers can be added later if needed by other architectures. For now, 32-bit architectures (x86-32 and arm) only handle PGTBL_PMD_MODIFIED, so p*d_populate_kernel() will never affect them unless we introduce a PMD level helper.
Sounds good!
Cheers, Lorenzo