From 3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 2 Sep 2026 15:31:14 -0700 Subject: treewide: refresh kmalloc_obj() conversions This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook --- arch/arm64/mm/pgd.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 arch/arm64/mm/pgd.c (limited to 'arch/arm64/mm/pgd.c') diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c new file mode 100644 index 000000000..bf5110b91 --- /dev/null +++ b/arch/arm64/mm/pgd.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PGD allocation/freeing + * + * Copyright (C) 2012 ARM Ltd. + * Author: Catalin Marinas + */ + +#include +#include +#include +#include + +#include +#include +#include + +static struct kmem_cache *pgd_cache __ro_after_init; + +static bool pgdir_is_page_size(void) +{ + if (PGD_SIZE == PAGE_SIZE) + return true; + if (CONFIG_PGTABLE_LEVELS == 4) + return !pgtable_l4_enabled(); + if (CONFIG_PGTABLE_LEVELS == 5) + return !pgtable_l5_enabled(); + return false; +} + +pgd_t *pgd_alloc(struct mm_struct *mm) +{ + gfp_t gfp = GFP_PGTABLE_USER; + + if (pgdir_is_page_size()) + return __pgd_alloc(mm, 0); + else + return kmem_cache_alloc(pgd_cache, gfp); +} + +void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + if (pgdir_is_page_size()) + __pgd_free(mm, pgd); + else + kmem_cache_free(pgd_cache, pgd); +} + +void __init pgtable_cache_init(void) +{ + if (pgdir_is_page_size()) + return; + +#ifdef CONFIG_ARM64_PA_BITS_52 + /* + * With 52-bit physical addresses, the architecture requires the + * top-level table to be aligned to at least 64 bytes. + */ + BUILD_BUG_ON(!IS_ALIGNED(PGD_SIZE, 64)); +#endif + + /* + * Naturally aligned pgds required by the architecture. + */ + pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE, + SLAB_PANIC, NULL); +} -- cgit v1.3.1