Commit 985db026 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/8xx: Copy kernel PGD entries into all PGDIRs 



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: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/c6d2bf5af2ea909071a85bdca8b1f5dc2df134a8.1724173828.git.christophe.leroy@csgroup.eu
parent 65a82e11

arch/powerpc/include/asm/nohash/pgalloc.h

+7 −1
Original line number Diff line number Diff line
@@ -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)