[PATCH v7 02/15] arm64: mm: Drop redundant pgd_t* argument from map_mem()
From: Ard Biesheuvel <hidden>
Date: 2026-05-29 15:02:51
Also in:
linux-arm-kernel, linux-hardening, linux-mm, linux-sh, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: Ard Biesheuvel <ardb@kernel.org> __map_memblock() and map_mem() always operate on swapper_pg_dir, so there is no need to pass around a pgd_t pointer between them. Reviewed-by: Ryan Roberts <ryan.roberts@arm.com> Reviewed-by: Kevin Brodsky <redacted> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/arm64/mm/mmu.c | 25 ++++++++++---------- 1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 112fa4a3b0eb..aa0e2c6435f7 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c@@ -1035,11 +1035,11 @@ static void update_mapping_prot(phys_addr_t phys, unsigned long virt, flush_tlb_kernel_range(virt, virt + size); } -static void __init __map_memblock(pgd_t *pgdp, phys_addr_t start, - phys_addr_t end, pgprot_t prot, int flags) +static void __init __map_memblock(phys_addr_t start, phys_addr_t end, + pgprot_t prot, int flags) { - early_create_pgd_mapping(pgdp, start, __phys_to_virt(start), end - start, - prot, early_pgtable_alloc, flags); + early_create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start), + end - start, prot, early_pgtable_alloc, flags); } void __init mark_linear_text_alias_ro(void)
@@ -1087,13 +1087,13 @@ static phys_addr_t __init arm64_kfence_alloc_pool(void) return kfence_pool; } -static void __init arm64_kfence_map_pool(phys_addr_t kfence_pool, pgd_t *pgdp) +static void __init arm64_kfence_map_pool(phys_addr_t kfence_pool) { if (!kfence_pool) return; /* KFENCE pool needs page-level mapping. */ - __map_memblock(pgdp, kfence_pool, kfence_pool + KFENCE_POOL_SIZE, + __map_memblock(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, pgprot_tagged(PAGE_KERNEL), NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS); memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
@@ -1129,11 +1129,11 @@ bool arch_kfence_init_pool(void) #else /* CONFIG_KFENCE */ static inline phys_addr_t arm64_kfence_alloc_pool(void) { return 0; } -static inline void arm64_kfence_map_pool(phys_addr_t kfence_pool, pgd_t *pgdp) { } +static inline void arm64_kfence_map_pool(phys_addr_t kfence_pool) { } #endif /* CONFIG_KFENCE */ -static void __init map_mem(pgd_t *pgdp) +static void __init map_mem(void) { static const u64 direct_map_end = _PAGE_END(VA_BITS_MIN); phys_addr_t kernel_start = __pa_symbol(_text);
@@ -1178,7 +1178,7 @@ static void __init map_mem(pgd_t *pgdp) * if MTE is present. Otherwise, it has the same attributes as * PAGE_KERNEL. */ - __map_memblock(pgdp, start, end, pgprot_tagged(PAGE_KERNEL), + __map_memblock(start, end, pgprot_tagged(PAGE_KERNEL), flags); }
@@ -1192,10 +1192,9 @@ static void __init map_mem(pgd_t *pgdp) * Note that contiguous mappings cannot be remapped in this way, * so we should avoid them here. */ - __map_memblock(pgdp, kernel_start, kernel_end, - PAGE_KERNEL, NO_CONT_MAPPINGS); + __map_memblock(kernel_start, kernel_end, PAGE_KERNEL, NO_CONT_MAPPINGS); memblock_clear_nomap(kernel_start, kernel_end - kernel_start); - arm64_kfence_map_pool(early_kfence_pool, pgdp); + arm64_kfence_map_pool(early_kfence_pool); } void mark_rodata_ro(void)
@@ -1417,7 +1416,7 @@ static void __init create_idmap(void) void __init paging_init(void) { - map_mem(swapper_pg_dir); + map_mem(); memblock_allow_resize();
--
2.54.0.823.g6e5bcc1fc9-goog