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s390: enable ARCH_HAS_MEMBARRIER_SYNC_CORE 

JIRA: https://issues.redhat.com/browse/RHEL-54248

commit e7615c9225d7c7562d1cd95ba8cc2cbf38c3d29e
Author: Heiko Carstens <hca@linux.ibm.com>
Date:   Fri Mar 17 10:31:40 2023 +0100

    s390: enable ARCH_HAS_MEMBARRIER_SYNC_CORE

    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>

Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Thomas Huth 2024-06-19 17:33:59 +02:00
parent e865156279
commit a0ed5d4b01
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.
@ -46,7 +46,7 @@
| parisc: | TODO |
| powerpc: | ok |
| riscv: | TODO |
| s390: | TODO |
| s390: | ok |
| sh: | TODO |
| sparc: | TODO |
| um: | TODO |

1
arch/s390/Kconfig
View File

@ -72,6 +72,7 @@ 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