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authorNicholas Piggin <npiggin@gmail.com>2020-09-14 14:52:17 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2020-09-16 12:24:37 +1000
commit66acd46080bd9e5ad2be4b0eb1d498d5145d058e (patch)
tree8587b1bb6eb4efab8b2636f1f07093d50204d0d5 /arch/powerpc/Kconfig
parentd53c3dfb23c45f7d4f910c3a3ca84bf0a99c6143 (diff)
powerpc: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
powerpc uses IPIs in some situations to switch a kernel thread away from a lazy tlb mm, which is subject to the TLB flushing race described in the changelog introducing ARCH_WANT_IRQS_OFF_ACTIVATE_MM. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200914045219.3736466-3-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 1f48bbfb3ce9..65cb32211574 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -149,6 +149,7 @@ config PPC
select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS
select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS
select ARCH_WANT_IPC_PARSE_VERSION
+ select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
select ARCH_WEAK_RELEASE_ACQUIRE
select BINFMT_ELF
select BUILDTIME_TABLE_SORT