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s390: enable ARCH_HAS_MEMBARRIER_SYNC_CORE

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s390 trivially supports the ARCH_HAS_MEMBARRIER_SYNC_CORE requirements
since the used lpswe(y) instruction to return from any kernel context to
user space performs CPU serialization. This is very similar to arm, arm64
and powerpc.

See commit 70216e18e5 ("membarrier: Provide core serializing command,
*_SYNC_CORE") for further details.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-03-17 10:31:40 +01:00 committed by Vasily Gorbik
parent af90d7b69c
commit e7615c9225
2 changed files with 3 additions and 2 deletions
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4
Documentation/features/sched/membarrier-sync-core/arch-support.txt
View File

@ -5,7 +5,7 @@
#
# Architecture requirements
#
# * arm/arm64/powerpc
# * arm/arm64/powerpc/s390
#
# Rely on implicit context synchronization as a result of exception return
# when returning from IPI handler, and when returning to user-space.
@ -45,7 +45,7 @@
| parisc: | TODO |
| powerpc: | ok |
| riscv: | TODO |
| s390: | TODO |
| s390: | ok |
| sh: | TODO |
| sparc: | TODO |
| um: | TODO |

1
arch/s390/Kconfig
View File

@ -76,6 +76,7 @@ config S390
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE
select ARCH_HAS_KCOV
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_MEM_ENCRYPT
select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
select ARCH_HAS_PTE_SPECIAL