From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: [PATCH v2 23/44] arm,smp: Remove trace_.*_rcuidle() usage Date: Mon, 19 Sep 2022 12:00:02 +0200 Message-ID: <20220919101521.886766952@infradead.org> References: <20220919095939.761690562@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 1589F425DC DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org E5B67425CE DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 78443416FE DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org A077E416F2 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=rveYe0whW8HL+t/HGSaazkf4IJzq2XAc7vdeRKjh+gA=; b=eDRmeX8n8KBUn6/CAr9rKpy/RP 2UJXTWSy9Z5hbIlL+Y6yo0LWkUZm1nFVVk0qgHKpQWM9+mi6/uumgd0hvjnMAn3XSVpZxWzD8m+74 JXBp+z4yXIwfYDRZUAs3OZnRMmPjEIXxm+y8lmvo6cAM8EXbFG0XxYBS/Qgd9MoowJrgyt4+6rd8d zj5sYNjaG7FxjQ49N6+Lnd95idPaT1s+5VG/BByjgLeZD+rMnz31Zul5NKFlGosM11YW0NCf20GGn k/69f9ALqsPoW6rpNDxkzlxkZkdxlPYq25PvApPNCIfeE0FIawzbekVyy/XMjyx0JlunPKd8sOvH0 xy17ZOgA==; List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: peterz@infradead.org Cc: juri.lelli@redhat.com, rafael@kernel.org, catalin.marinas@arm.com, linus.walleij@linaro.org, bsegall@google.com, guoren@kernel.org, pavel@ucw.cz, agordeev@linux.ibm.com, linux-arch@vger.kernel.org, vincent.guittot@linaro.org, mpe@ellerman.id.au, chenhuacai@kernel.org, christophe.leroy@csgroup.eu, linux-acpi@vger.kernel.org, agross@kernel.org, geert@linux-m68k.org, linux-imx@nxp.com, vgupta@kernel.org, mattst88@gmail.com, mturquette@baylibre.com, sammy@sammy.net, pmladek@suse.com, linux-pm@vger.kernel.org, Sascha Hauer , linux-um@lists.infradead.org, npiggin@gmail.com, tglx@linutronix.de, linux-omap@vger.kernel.org, dietmar.eggemann@arm.com, andreyknvl@gmail.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, senozhatsky@chromium.org, svens@linux.ibm.com, jolsa@kernel.org, tj@kernel.org, Andrew Morton None of these functions should ever be ran with RCU disabled anymore. Specifically, do_handle_IPI() is only called from handle_IPI() which explicitly does irq_enter()/irq_exit() which ensures RCU is watching. The problem with smp_cross_call() was, per commit 7c64cc0531fa ("arm: Use _rcuidle for smp_cross_call() tracepoints"), that cpuidle_enter_state_coupled() already had RCU disabled, but that's long been fixed by commit 1098582a0f6c ("sched,idle,rcu: Push rcu_idle deeper into the idle path"). Signed-off-by: Peter Zijlstra (Intel) --- arch/arm/kernel/smp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -639,7 +639,7 @@ static void do_handle_IPI(int ipinr) unsigned int cpu = smp_processor_id(); if ((unsigned)ipinr < NR_IPI) - trace_ipi_entry_rcuidle(ipi_types[ipinr]); + trace_ipi_entry(ipi_types[ipinr]); switch (ipinr) { case IPI_WAKEUP: @@ -686,7 +686,7 @@ static void do_handle_IPI(int ipinr) } if ((unsigned)ipinr < NR_IPI) - trace_ipi_exit_rcuidle(ipi_types[ipinr]); + trace_ipi_exit(ipi_types[ipinr]); } /* Legacy version, should go away once all irqchips have been converted */ @@ -709,7 +709,7 @@ static irqreturn_t ipi_handler(int irq, static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) { - trace_ipi_raise_rcuidle(target, ipi_types[ipinr]); + trace_ipi_raise(target, ipi_types[ipinr]); __ipi_send_mask(ipi_desc[ipinr], target); }