From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au,
linux-nvdimm@lists.01.org, dan.j.williams@intel.com
Cc: Jan Kara <jack@suse.cz>, Jeff Moyer <jmoyer@redhat.com>,
msuchanek@suse.de, oohall@gmail.com,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: [RFC PATCH v2 2/5] powerpc/pmem: Disable synchronous fault by default
Date: Tue, 2 Jun 2020 13:19:06 +0530 [thread overview]
Message-ID: <20200602074909.36738-2-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20200602074909.36738-1-aneesh.kumar@linux.ibm.com>
This adds a kernel config option that controls whether MAP_SYNC is enabled by
default. With POWER10, architecture is adding new pmem flush and sync
instructions. The kernel should prevent the usage of MAP_SYNC if applications
are not using the new instructions on newer hardware.
This config allows user to control whether MAP_SYNC should be enabled by
default or not.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/platforms/Kconfig.cputype | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 27a81c291be8..f8694838ad4e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -383,6 +383,15 @@ config PPC_KUEP
If you're unsure, say Y.
+config ARCH_MAP_SYNC_DISABLE
+ bool "Disable synchronous fault support (MAP_SYNC)"
+ default y
+ help
+ Disable support for synchronous fault with nvdimm namespaces.
+
+ If you're unsure, say Y.
+
+
config PPC_HAVE_KUAP
bool
--
2.26.2
next prev parent reply other threads:[~2020-06-02 7:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 7:49 [RFC PATCH v2 1/5] libnvdimm/dax: Add a dax flag to control synchronous fault support Aneesh Kumar K.V
2020-06-02 7:49 ` Aneesh Kumar K.V [this message]
2020-06-02 7:49 ` [RFC PATCH v2 3/5] libnvdimm/dax: Make DAXDEV_SYNC_ENABLED flag region-specific Aneesh Kumar K.V
2020-06-02 7:49 ` [RFC PATCH v2 4/5] powerpc/papr_scm: disable MAP_SYNC for newer hardware Aneesh Kumar K.V
2020-06-02 7:49 ` [RFC PATCH v2 5/5] libnvdimm: Add prctl control for disabling synchronous fault support Aneesh Kumar K.V
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