linux-kernel - [tip:sched/urgent] membarrier/arm64: Provide core serializing command

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Date:   Mon, 5 Feb 2018 13:30:00 -0800
From:   tip-bot for Mathieu Desnoyers <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     sehr@...gle.com, avi@...lladb.com, linux@...linux.org.uk,
        peterz@...radead.org, parri.andrea@...il.com, hpa@...or.com,
        mpe@...erman.id.au, benh@...nel.crashing.org, boqun.feng@...il.com,
        davejwatson@...com, torvalds@...ux-foundation.org,
        mingo@...nel.org, mathieu.desnoyers@...icios.com,
        will.deacon@....com, ghackmann@...gle.com,
        paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        maged.michael@...il.com, ahh@...gle.com, tglx@...utronix.de,
        paulus@...ba.org, luto@...nel.org
Subject: [tip:sched/urgent] membarrier/arm64: Provide core serializing
 command

Commit-ID:  f1e3a12b6543a73cfd47aa7da16d3d73d297795e
Gitweb:     https://git.kernel.org/tip/f1e3a12b6543a73cfd47aa7da16d3d73d297795e
Author:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
AuthorDate: Mon, 29 Jan 2018 15:20:19 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 5 Feb 2018 21:35:17 +0100

membarrier/arm64: Provide core serializing command

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrea Parri <parri.andrea@...il.com>
Cc: Andrew Hunter <ahh@...gle.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Avi Kivity <avi@...lladb.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Dave Watson <davejwatson@...com>
Cc: David Sehr <sehr@...gle.com>
Cc: Greg Hackmann <ghackmann@...gle.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Maged Michael <maged.michael@...il.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Russell King <linux@...linux.org.uk>
Cc: Will Deacon <will.deacon@....com>
Cc: linux-api@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Link: http://lkml.kernel.org/r/20180129202020.8515-11-mathieu.desnoyers@efficios.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/arm64/Kconfig        | 1 +
 arch/arm64/kernel/entry.S | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c9a7e9e..5b0c06d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -16,6 +16,7 @@ config ARM64
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 	select ARCH_HAS_KCOV
+	select ARCH_HAS_MEMBARRIER_SYNC_CORE
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_SG_CHAIN
 	select ARCH_HAS_STRICT_KERNEL_RWX
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 6d14b8f..5edde1c 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -302,6 +302,10 @@ alternative_else_nop_endif
 	ldp	x28, x29, [sp, #16 * 14]
 	ldr	lr, [sp, #S_LR]
 	add	sp, sp, #S_FRAME_SIZE		// restore sp
+	/*
+	 * ARCH_HAS_MEMBARRIER_SYNC_CORE rely on eret context synchronization
+	 * when returning from IPI handler, and when returning to user-space.
+	 */
 	eret					// return to kernel
 	.endm