Alexandre Ghiti <alexghiti@rivosinc.com> says:
This series is a follow-up for riscv of a recent series from Ryan [1] which
converts all direct dereferences of pte_t into a ptet_get() access.
The goal here for riscv is to use READ_ONCE()/WRITE_ONCE() for all page
table entries accesses to avoid any compiler transformation when the
hardware can concurrently modify the page tables entries (A/D bits for
example).
I went a bit further and added pud/p4d/pgd_get() helpers as such concurrent
modifications can happen too at those levels.
[1] https://lore.kernel.org/all/
20230612151545.
3317766-1-ryan.roberts@arm.com/
* b4-shazam-merge:
riscv: Use accessors to page table entries instead of direct dereference
riscv: mm: Only compile pgtable.c if MMU
mm: Introduce pudp/p4dp/pgdp_get() functions
riscv: Use WRITE_ONCE() when setting page table entries
Link: https://lore.kernel.org/r/20231213203001.179237-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>