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From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Phil Auld <pauld@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH 5/5] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK
Date: Tue, 17 Nov 2020 16:16:37 +0100	[thread overview]
Message-ID: <20201117151637.259084-6-frederic@kernel.org> (raw)
In-Reply-To: <20201117151637.259084-1-frederic@kernel.org>

A lot of ground work has been performed on x86 entry code. Fragile path
between user_enter() and user_exit() have IRQs disabled. Uses of RCU and
intrumentation in these fragile areas have been explicitly annotated
and protected.

This architecture doesn't need exception_enter()/exception_exit()
anymore and has therefore earned CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Phil Auld <pauld@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f6946b81f74a..d793361839b5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -162,6 +162,7 @@ config X86
 	select HAVE_CMPXCHG_DOUBLE
 	select HAVE_CMPXCHG_LOCAL
 	select HAVE_CONTEXT_TRACKING		if X86_64
+	select HAVE_CONTEXT_TRACKING_OFFSTACK	if HAVE_CONTEXT_TRACKING
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_CONTIGUOUS
-- 
2.25.1


  parent reply	other threads:[~2020-11-17 15:17 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-17 15:16 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v3 Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 1/5] context_tracking: Introduce HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 2/5] context_tracking: Don't implement exception_enter/exit() on CONFIG_HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 3/5] sched: Detect call to schedule from critical entry code Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` [PATCH 4/5] context_tracking: Only define schedule_user() on !HAVE_CONTEXT_TRACKING_OFFSTACK archs Frederic Weisbecker
2020-11-20 12:44   ` [tip: core/entry] " tip-bot2 for Frederic Weisbecker
2020-11-17 15:16 ` Frederic Weisbecker [this message]
2020-11-20 12:44   ` [tip: core/entry] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK tip-bot2 for Frederic Weisbecker
2020-11-18  7:39 ` [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v3 Peter Zijlstra
2020-11-18 13:48   ` Frederic Weisbecker
2020-11-18 14:05     ` Peter Zijlstra
2020-11-18 14:20       ` Frederic Weisbecker
  -- strict thread matches above, loose matches on Subject: below --
2020-10-27 15:08 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() v2 Frederic Weisbecker
2020-10-27 15:08 ` [PATCH 5/5] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker
2020-10-05 10:49 [PATCH 0/5] context_tracking: Flatter archs not using exception_enter/exit() Frederic Weisbecker
2020-10-05 10:49 ` [PATCH 5/5] x86: Support HAVE_CONTEXT_TRACKING_OFFSTACK Frederic Weisbecker

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