diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2024-08-20 19:23:51 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-08-30 21:29:53 +1000 |
| commit | 16a71c045186a11c1c743934e330de78162b86dd (patch) | |
| tree | 97573066f9238da54ed165c1b6a9942f1354babd | |
| parent | c5eec4df25c34f4bee8c757ed157f5d96eaba554 (diff) | |
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: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/a7180cc1ba59dec4502af39b4e9f3ff91c57280d.1724173828.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/mm/mem.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index d325217ab201..7a5af64f165d 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -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] = { |