In order to avoid having to select PGDIR at each TLB miss based on fault address, copy kernel PGD entries into all PGDIRs in pgd_alloc().
At first it will be used for ITLB misses for kernel TEXT, then for execmem then for kernel DATA. Signed-off-by: Christophe Leroy <[email protected]> --- arch/powerpc/include/asm/nohash/pgalloc.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/nohash/pgalloc.h b/arch/powerpc/include/asm/nohash/pgalloc.h index d06efac6d7aa..4ef780b291bc 100644 --- a/arch/powerpc/include/asm/nohash/pgalloc.h +++ b/arch/powerpc/include/asm/nohash/pgalloc.h @@ -19,8 +19,14 @@ static inline void tlb_flush_pgtable(struct mmu_gather *tlb, static inline pgd_t *pgd_alloc(struct mm_struct *mm) { - return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), + pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), pgtable_gfp_flags(mm, GFP_KERNEL)); + +#ifdef CONFIG_PPC_8xx + memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, + (MAX_PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); +#endif + return pgd; } static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) -- 2.44.0
