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[07/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for m68k-coldfire

Message ID 20260901-rcu-pagetable-freeing-v1-7-5456a81c8212@kernel.org
State New
Headers show
Series mm: make userland page table freeing RCU-safe | expand

Commit Message

Lorenzo Stoakes (ARM) Sept. 1, 2026, 11:01 a.m. UTC 
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 mbox series

Patch

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)