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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2018-01-29 15:20:17 -0500
committerIngo Molnar <mingo@kernel.org>2018-02-05 21:35:03 +0100
commit70216e18e519a54a2f13569e8caff99a092a92d6 (patch)
tree000536088ca3d1e7869e28b56bb5ad2ac6a49740 /init/Kconfig
parentac1ab12a3e6e878274e7107c8c6f326694a1c1f3 (diff)
downloadlwn-70216e18e519a54a2f13569e8caff99a092a92d6.tar.gz
lwn-70216e18e519a54a2f13569e8caff99a092a92d6.zip
membarrier: Provide core serializing command, *_SYNC_CORE
Provide core serializing membarrier command to support memory reclaim by JIT. Each architecture needs to explicitly opt into that support by documenting in their architecture code how they provide the core serializing instructions required when returning from the membarrier IPI, and after the scheduler has updated the curr->mm pointer (before going back to user-space). They should then select ARCH_HAS_MEMBARRIER_SYNC_CORE to enable support for that command on their architecture. Architectures selecting this feature need to either document that they issue core serializing instructions when returning to user-space, or implement their architecture-specific sync_core_before_usermode(). Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Andrew Hunter <ahh@google.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Avi Kivity <avi@scylladb.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Dave Watson <davejwatson@fb.com> Cc: David Sehr <sehr@google.com> Cc: Greg Hackmann <ghackmann@google.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maged Michael <maged.michael@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-api@vger.kernel.org Cc: linux-arch@vger.kernel.org Link: http://lkml.kernel.org/r/20180129202020.8515-9-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 535421facea8..e37f4b2a6445 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1415,6 +1415,9 @@ config USERFAULTFD
config ARCH_HAS_MEMBARRIER_CALLBACKS
bool
+config ARCH_HAS_MEMBARRIER_SYNC_CORE
+ bool
+
config EMBEDDED
bool "Embedded system"
option allnoconfig_y