Some architectures set and maintain the mm_cpumask bits when loading or removing process from cpu. This Kconfig will mark those to allow different behavior between kernels that maintain the mm_cpumask and those that do not. Signed-off-by: Yair Podemsky <ypodemsk@xxxxxxxxxx> --- arch/Kconfig | 8 ++++++++ arch/arm/Kconfig | 1 + arch/powerpc/Kconfig | 1 + arch/s390/Kconfig | 1 + arch/sparc/Kconfig | 1 + arch/x86/Kconfig | 1 + 6 files changed, 13 insertions(+) diff --git a/arch/Kconfig b/arch/Kconfig index 205fd23e0cad..953fbfa5a2ad 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1466,6 +1466,14 @@ config ARCH_HAS_NONLEAF_PMD_YOUNG address translations. Page table walkers that clear the accessed bit may use this capability to reduce their search space. +config ARCH_HAS_CPUMASK_BITS + bool + help + Architectures that select this option set bits on the mm_cpumask + to mark which cpus loaded the mm, The mask can then be used to + control mm specific actions such as tlb_flush. + + source "kernel/gcov/Kconfig" source "scripts/gcc-plugins/Kconfig" diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 0fb4b218f665..cd20e96bc1dc 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -70,6 +70,7 @@ config ARM select GENERIC_SMP_IDLE_THREAD select HARDIRQS_SW_RESEND select HAS_IOPORT + select ARCH_HAS_CPUMASK_BITS select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index bff5820b7cda..c9218722aa2f 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -156,6 +156,7 @@ config PPC select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UACCESS_FLUSHCACHE select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_CPUMASK_BITS select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_KEEP_MEMBLOCK select ARCH_MIGHT_HAVE_PC_PARPORT diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 6dab9c1be508..60bf29bc3f87 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -84,6 +84,7 @@ config S390 select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_VDSO_DATA + select ARCH_HAS_CPUMASK_BITS select ARCH_HAVE_NMI_SAFE_CMPXCHG select ARCH_INLINE_READ_LOCK select ARCH_INLINE_READ_LOCK_BH diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 8535e19062f6..e8bf4d769306 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -99,6 +99,7 @@ config SPARC64 select ARCH_HAS_PTE_SPECIAL select PCI_DOMAINS if PCI select ARCH_HAS_GIGANTIC_PAGE + select ARCH_HAS_CPUMASK_BITS select HAVE_SOFTIRQ_ON_OWN_STACK select HAVE_SETUP_PER_CPU_AREA select NEED_PER_CPU_EMBED_FIRST_CHUNK diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 53bab123a8ee..b351421695f3 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -185,6 +185,7 @@ config X86 select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_STACKLEAK select HAVE_ARCH_TRACEHOOK + select ARCH_HAS_CPUMASK_BITS select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64 select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD -- 2.39.3
