Commit 16a71c04 authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/8xx: Preallocate execmem page tables 



Preallocate execmem page tables before creating new PGDs so that
all PGD entries related to execmem can be copied in pgd_alloc().

On 8xx there are 32 Mbytes for execmem by default so this will use
32 kbytes.

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/a7180cc1ba59dec4502af39b4e9f3ff91c57280d.1724173828.git.christophe.leroy@csgroup.eu
parent c5eec4df

arch/powerpc/mm/mem.c

+14 −0
Original line number Diff line number Diff line
@@ -412,6 +412,18 @@ EXPORT_SYMBOL_GPL(walk_system_ram_range); 
#ifdef CONFIG_EXECMEM

static struct execmem_info execmem_info __ro_after_init;



#ifdef CONFIG_PPC_8xx

static void prealloc_execmem_pgtable(void)

{

	unsigned long va;



	for (va = ALIGN_DOWN(MODULES_VADDR, PGDIR_SIZE); va < MODULES_END; va += PGDIR_SIZE)

		pte_alloc_kernel(pmd_off_k(va), va);

}

#else

static void prealloc_execmem_pgtable(void) { }

#endif



struct execmem_info __init *execmem_arch_setup(void)

{

	pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
@@ -443,6 +455,8 @@ struct execmem_info __init *execmem_arch_setup(void) 
	end = VMALLOC_END;

#endif



	prealloc_execmem_pgtable();



	execmem_info = (struct execmem_info){

		.ranges = {

			[EXECMEM_DEFAULT] = {