[PATCH 07/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for m68k-coldfire
From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Date: 2026-09-01 11:06:59
Also in:
linux-alpha, linux-arch, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, lkml, loongarch, sparclinux
Subsystem:
m68k architecture, the rest · Maintainers:
Geert Uytterhoeven, Linus Torvalds
Similar to sun3, the coldfire variant of m68k uses 2-level page tables. Update its __pte_free_tlb() function to use tlb_remove_ptdesc() in order that, with CONFIG_MMU_GATHER_RCU_TABLE_FREE, page tables are freed under RCU. The page tables occupy a page each and have no odd semantics, so this change suffices to allow enabling of CONFIG_MMU_GATHER_RCU_TABLE_FREE for m68k-coldfire, so do so. This forms part of an overall effort to switch every architecture to this mode. Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org> --- arch/m68k/Kconfig | 2 +- arch/m68k/include/asm/mcf_pgalloc.h | 5 +---- 2 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index e29610fd1240..6b8ec67c86fd 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig@@ -36,7 +36,7 @@ config M68K select HAVE_MOD_ARCH_SPECIFIC select HAVE_UID16 select MMU_GATHER_NO_RANGE if MMU - select MMU_GATHER_RCU_TABLE_FREE if MMU && SUN3 + select MMU_GATHER_RCU_TABLE_FREE if MMU && (SUN3 || COLDFIRE) select MODULES_USE_ELF_REL select MODULES_USE_ELF_RELA select NO_DMA if !MMU && !COLDFIRE
diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
index fc5454d37da3..b53ff0950db2 100644
--- a/arch/m68k/include/asm/mcf_pgalloc.h
+++ b/arch/m68k/include/asm/mcf_pgalloc.h@@ -39,10 +39,7 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address) static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable, unsigned long address) { - struct ptdesc *ptdesc = virt_to_ptdesc(pgtable); - - pagetable_dtor(ptdesc); - pagetable_free(ptdesc); + tlb_remove_ptdesc(tlb, virt_to_ptdesc(pgtable)); } static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
--
2.55.0