Commit 82ef440f authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/603: Copy kernel PGD entries into all PGDIRs and preallocate execmem page tables 



For the same reason as 8xx, copy kernel PGD entries into all
PGDIRs in pgd_alloc() and preallocate execmem page tables before
creating new PGDs so that all PGD entries related to execmem are
copied by pgd_alloc().

This will help reduce the fast-path in TLBmiss handlers.

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/1a0d1feee07c4cf955f6a43a704c203e5c90fa53.1724173828.git.christophe.leroy@csgroup.eu
parent 2f2b9a3a

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

+1 −1
Original line number Diff line number Diff line
@@ -22,7 +22,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm) 
	pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),

			pgtable_gfp_flags(mm, GFP_KERNEL));



#ifdef CONFIG_PPC_8xx

#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)

	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

arch/powerpc/mm/mem.c

+1 −1
Original line number Diff line number Diff line
@@ -412,7 +412,7 @@ EXPORT_SYMBOL_GPL(walk_system_ram_range); 
#ifdef CONFIG_EXECMEM

static struct execmem_info execmem_info __ro_after_init;



#ifdef CONFIG_PPC_8xx

#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)

static void prealloc_execmem_pgtable(void)

{

	unsigned long va;