summaryrefslogtreecommitdiff
path: root/arch/Kconfig
diff options
context:
space:
mode:
authorPeter Zijlstra <peterz@infradead.org>2020-02-04 04:36:49 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-04 06:05:26 +0300
commit0ed1325967ab5f7a4549a2641c6ebe115f76e228 (patch)
treed8374c4245c4aa0faff50b5e9fae4ec55bcfce13 /arch/Kconfig
parent12e4d53f3f04e81f9e83d6fc10edc7314ab9f6b9 (diff)
downloadlinux-0ed1325967ab5f7a4549a2641c6ebe115f76e228.tar.xz
mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush
Architectures for which we have hardware walkers of Linux page table should flush TLB on mmu gather batch allocation failures and batch flush. Some architectures like POWER supports multiple translation modes (hash and radix) and in the case of POWER only radix translation mode needs the above TLBI. This is because for hash translation mode kernel wants to avoid this extra flush since there are no hardware walkers of linux page table. With radix translation, the hardware also walks linux page table and with that, kernel needs to make sure to TLB invalidate page walk cache before page table pages are freed. More details in commit d86564a2f085 ("mm/tlb, x86/mm: Support invalidating TLB caches for RCU_TABLE_FREE") The changes to sparc are to make sure we keep the old behavior since we are now removing HAVE_RCU_TABLE_NO_INVALIDATE. The default value for tlb_needs_table_invalidate is to always force an invalidate and sparc can avoid the table invalidate. Hence we define tlb_needs_table_invalidate to false for sparc architecture. Link: http://lkml.kernel.org/r/20200116064531.483522-3-aneesh.kumar@linux.ibm.com Fixes: a46cc7a90fd8 ("powerpc/mm/radix: Improve TLB/PWC flushes") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Cc: <stable@vger.kernel.org> [4.14+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 48b5e103bdb0..208aad121630 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -396,9 +396,6 @@ config HAVE_ARCH_JUMP_LABEL_RELATIVE
config HAVE_RCU_TABLE_FREE
bool
-config HAVE_RCU_TABLE_NO_INVALIDATE
- bool
-
config HAVE_MMU_GATHER_PAGE_SIZE
bool