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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	dri-devel@lists.freedesktop.org, Ben Segall <bsegall@google.com>,
	linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
	linux-hexagon@vger.kernel.org, Will Deacon <will@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	linux-arch@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Brian Cain <bcain@codeaurora.org>,
	Richard Weinberger <richard@nod.at>,
	Russell King <linux@armlinux.org.uk>,
	David Airlie <airlied@linux.ie>, Ingo Molnar <mingo@redhat.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Mel Gorman <mgorman@suse.de>,
	intel-gfx@lists.freedesktop.org, Matt Turner <mattst88@gmail.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	linux-xtensa@linux-xtensa.org, Shuah Khan <shuah@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Jeff Dike <jdike@addtoit.com>,
	linux-um@lists.infradead.org,
	Josh Triplett <josh@joshtriplett.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	rcu@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	Richard Henderson <rth@twiddle.net>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Linus Torvalds <torvalds@linuxfoundation.org>,
	linux-alpha@vger.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: [patch 01/13] lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies
Date: Mon, 14 Sep 2020 22:42:10 +0200
Message-ID: <20200914204440.969090025@linutronix.de> (raw)
In-Reply-To: <20200914204209.256266093@linutronix.de>

ARCH_NO_PREEMPT disables the selection of CONFIG_PREEMPT_VOLUNTARY and
CONFIG_PREEMPT, but architectures which set this config option still
support preempt count for hard and softirq accounting.

There is absolutely no reason to prevent lockdep from using the preempt
counter nor is there a reason to prevent the enablement of
CONFIG_DEBUG_ATOMIC_SLEEP on such architectures.

Remove the dependencies, which affects ALPHA, HEXAGON, M68K and UM.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: linux-alpha@vger.kernel.org
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: linux-um@lists.infradead.org
Cc: Brian Cain <bcain@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
---
 lib/Kconfig.debug |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1161,7 +1161,7 @@ config PROVE_LOCKING
 	select DEBUG_RWSEMS
 	select DEBUG_WW_MUTEX_SLOWPATH
 	select DEBUG_LOCK_ALLOC
-	select PREEMPT_COUNT if !ARCH_NO_PREEMPT
+	select PREEMPT_COUNT
 	select TRACE_IRQFLAGS
 	default n
 	help
@@ -1323,7 +1323,6 @@ config DEBUG_ATOMIC_SLEEP
 	bool "Sleep inside atomic section checking"
 	select PREEMPT_COUNT
 	depends on DEBUG_KERNEL
-	depends on !ARCH_NO_PREEMPT
 	help
 	  If you say Y here, various routines which may sleep will become very
 	  noisy if they are called inside atomic sections: when a spinlock is

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Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-14 20:42 [patch 00/13] preempt: Make preempt count unconditional Thomas Gleixner
2020-09-14 20:42 ` Thomas Gleixner [this message]
2020-09-14 20:42 ` [patch 02/13] " Thomas Gleixner
2020-09-14 20:42 ` [patch 03/13] preempt: Clenaup PREEMPT_COUNT leftovers Thomas Gleixner
2020-09-14 20:42 ` [patch 04/13] lockdep: " Thomas Gleixner
2020-09-15 16:11   ` Will Deacon
2020-09-14 20:42 ` [patch 05/13] mm/pagemap: " Thomas Gleixner
2020-09-14 20:42 ` [patch 06/13] locking/bitspinlock: " Thomas Gleixner
2020-09-15 16:10   ` Will Deacon
2020-09-14 20:42 ` [patch 07/13] uaccess: " Thomas Gleixner
2020-09-14 20:42 ` [patch 08/13] sched: " Thomas Gleixner
2020-09-14 20:42 ` [patch 09/13] ARM: " Thomas Gleixner
2020-09-14 20:42 ` [patch 10/13] xtensa: " Thomas Gleixner
2020-09-14 20:42 ` [patch 11/13] drm/i915: " Thomas Gleixner
2020-09-14 20:42 ` [patch 12/13] rcutorture: " Thomas Gleixner
2020-09-14 20:42 ` [patch 13/13] preempt: Remove PREEMPT_COUNT from Kconfig Thomas Gleixner
2020-09-14 20:54 ` [patch 00/13] preempt: Make preempt count unconditional Steven Rostedt
2020-09-14 20:59 ` Linus Torvalds
2020-09-14 21:55   ` Thomas Gleixner
2020-09-14 22:24     ` Linus Torvalds
2020-09-14 22:37       ` Linus Torvalds
2020-09-15  3:21         ` [PATCH] crypto: lib/chacha20poly1305 - Set SG_MITER_ATOMIC unconditionally Herbert Xu
2020-09-15  6:20         ` [patch 00/13] preempt: Make preempt count unconditional Ard Biesheuvel
2020-09-15  6:22           ` Herbert Xu
2020-09-15  6:39             ` Linus Torvalds
     [not found]               ` <87een35woz.fsf@nanos.tec.linutronix.de>
2020-09-15 17:29                 ` Linus Torvalds
     [not found]       ` <87bli75t7v.fsf@nanos.tec.linutronix.de>
2020-09-15 17:35         ` Linus Torvalds
2020-09-15 19:57           ` Thomas Gleixner
2020-09-16 18:34             ` Linus Torvalds
2020-09-16  7:37           ` Daniel Vetter
2020-09-16 15:29             ` Paul E. McKenney
2020-09-16 18:32               ` Linus Torvalds
2020-09-16 20:43                 ` Paul E. McKenney
2020-09-17  6:38                 ` Ard Biesheuvel
2020-09-16 20:29               ` Daniel Vetter
2020-09-16 20:58                 ` Paul E. McKenney
2020-09-16 21:43                   ` Daniel Vetter
2020-09-16 22:39                     ` Paul E. McKenney
2020-09-17  7:52                       ` Daniel Vetter
2020-09-17 16:28                         ` Paul E. McKenney
2020-09-29  8:19                     ` Michal Hocko
2020-09-29  8:19                       ` Michal Hocko
2020-09-29  8:20                       ` Michal Hocko
2020-09-29  8:21                       ` Michal Hocko
2020-09-29  8:23                       ` Michal Hocko
2020-09-29  9:00                       ` Daniel Vetter
2020-09-29 14:54                         ` Michal Hocko
2020-09-16 19:23     ` Matthew Wilcox
2020-09-16 20:48       ` Paul E. McKenney
2020-09-15 17:25   ` Paul E. McKenney

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