From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20200914204440.969090025@linutronix.de> Date: Mon, 14 Sep 2020 22:42:10 +0200 From: Thomas Gleixner Subject: [patch 01/13] lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies References: <20200914204209.256266093@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-transfer-encoding: 8-bit To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Sebastian Andrzej Siewior , Valentin Schneider , Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org, Jeff Dike , Richard Weinberger , Anton Ivanov , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Will Deacon , Andrew Morton , linux-mm@kvack.org, Ingo Molnar , Russell King , linux-arm-kernel@lists.infradead.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, "Paul E. McKenney" , Josh Triplett , Mathieu Desnoyers , Lai Jiangshan , Shuah Khan , rcu@vger.kernel.org, linux-kselftest@vger.kernel.org List-ID: 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 Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: linux-alpha@vger.kernel.org Cc: Jeff Dike Cc: Richard Weinberger Cc: Anton Ivanov Cc: linux-um@lists.infradead.org Cc: Brian Cain Cc: linux-hexagon@vger.kernel.org Cc: Geert Uytterhoeven 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