From: Barry Song <v-songbaohua@xxxxxxxx> Platforms like ARM64 have hareware TLB shootdown broadcast. They don't maintain mm_cpumask but just send tlbi and related sync instructions for TLB flush. task's mm_cpumask is normally empty in this case. We also allow deferred TLB flush on this kind of platforms. Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>> --- arch/arm/Kconfig | 1 + arch/loongarch/Kconfig | 1 + arch/mips/Kconfig | 1 + arch/openrisc/Kconfig | 1 + arch/powerpc/Kconfig | 1 + arch/riscv/Kconfig | 1 + arch/s390/Kconfig | 1 + arch/um/Kconfig | 1 + arch/x86/Kconfig | 1 + mm/Kconfig | 3 +++ mm/rmap.c | 4 ++++ 11 files changed, 16 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 7630ba9cb6cc..25c42747f488 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -13,6 +13,7 @@ config ARM select ARCH_HAS_KEEPINITRD select ARCH_HAS_KCOV select ARCH_HAS_MEMBARRIER_SYNC_CORE + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE select ARCH_HAS_PHYS_TO_DMA diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 1920d52653b4..4b737c0d17a2 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -7,6 +7,7 @@ config LOONGARCH select ARCH_ENABLE_MEMORY_HOTPLUG select ARCH_ENABLE_MEMORY_HOTREMOVE select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index db09d45d59ec..1b196acdeca3 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -9,6 +9,7 @@ config MIPS select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KCOV select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if !EVA + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_PTE_SPECIAL if !(32BIT && CPU_HAS_RIXI) select ARCH_HAS_STRNCPY_FROM_USER select ARCH_HAS_STRNLEN_USER diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index e814df4c483c..82483b192f4a 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -9,6 +9,7 @@ config OPENRISC select ARCH_32BIT_OFF_T select ARCH_HAS_DMA_SET_UNCACHED select ARCH_HAS_DMA_CLEAR_UNCACHED + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_SYNC_DMA_FOR_DEVICE select COMMON_CLK select OF diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c2ce2e60c8f0..19061ffe73a0 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -127,6 +127,7 @@ config PPC select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU select ARCH_HAS_MMIOWB if PPC64 + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PMEM_API diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c22f58155948..7570c95a9cc8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -25,6 +25,7 @@ config RISCV select ARCH_HAS_GIGANTIC_PAGE select ARCH_HAS_KCOV select ARCH_HAS_MMIOWB + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SET_DIRECT_MAP if MMU select ARCH_HAS_SET_MEMORY if MMU diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 91c0b80a8bf0..48d91fa05bab 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -73,6 +73,7 @@ config S390 select ARCH_HAS_GIGANTIC_PAGE select ARCH_HAS_KCOV select ARCH_HAS_MEM_ENCRYPT + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SCALED_CPUTIME select ARCH_HAS_SET_MEMORY diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 4ec22e156a2e..df29c729267b 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -8,6 +8,7 @@ config UML select ARCH_EPHEMERAL_INODES select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_KCOV + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_STRNCPY_FROM_USER select ARCH_HAS_STRNLEN_USER select ARCH_NO_PREEMPT diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index be0b95e51df6..a91d73866238 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -81,6 +81,7 @@ config X86 select ARCH_HAS_KCOV if X86_64 select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_MEMBARRIER_SYNC_CORE + select ARCH_HAS_MM_CPUMASK select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PMEM_API if X86_64 select ARCH_HAS_PTE_DEVMAP if X86_64 diff --git a/mm/Kconfig b/mm/Kconfig index 169e64192e48..7bf54f57ca01 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -951,6 +951,9 @@ config ARCH_HAS_CURRENT_STACK_POINTER register alias named "current_stack_pointer", this config can be selected. +config ARCH_HAS_MM_CPUMASK + bool + config ARCH_HAS_VM_GET_PAGE_PROT bool diff --git a/mm/rmap.c b/mm/rmap.c index 5bcb334cd6f2..13d4f9a1d4f1 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -692,6 +692,10 @@ static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags) if (!(flags & TTU_BATCH_FLUSH)) return false; +#ifndef CONFIG_ARCH_HAS_MM_CPUMASK + return true; +#endif + /* If remote CPUs need to be flushed then defer batch the flush */ if (cpumask_any_but(mm_cpumask(mm), get_cpu()) < nr_cpu_ids) should_defer = true; -- 2.25.1
