[PATCH v2 1/2] arch: Introduce ARCH_HAS_CPUMASK_BITS
From: Yair Podemsky <hidden>
Date: 2023-06-20 14:52:29
Also in:
linux-arch, linux-arm-kernel, linux-mm, linux-s390, lkml, sparclinux
Subsystem:
arm port, linux for powerpc (32-bit and 64-bit), s390 architecture, sparc + ultrasparc (sparc/sparc64), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Russell King, Madhavan Srinivasan, Michael Ellerman, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, "David S. Miller", Andreas Larsson, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 <redacted> --- 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
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2.39.3