linux-kernel - [tip:perf/urgent] perf/x86/intel/uncore: Clean up hotplug conversion fallout

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 1 Feb 2017 01:43:38 -0800
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     yasu.isimatu@...il.com, jolsa@...hat.com, eranian@...gle.com,
        peterz@...radead.org, alexander.shishkin@...ux.intel.com,
        mingo@...nel.org, bigeasy@...utronix.de, vincent.weaver@...ne.edu,
        linux-kernel@...r.kernel.org, hpa@...or.com, acme@...hat.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org
Subject: [tip:perf/urgent] perf/x86/intel/uncore: Clean up hotplug
 conversion fallout

Commit-ID:  1aa6cfd33df492939b0be15ebdbcff1f8ae5ddb6
Gitweb:     http://git.kernel.org/tip/1aa6cfd33df492939b0be15ebdbcff1f8ae5ddb6
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 31 Jan 2017 23:58:39 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 1 Feb 2017 08:37:27 +0100

perf/x86/intel/uncore: Clean up hotplug conversion fallout

The recent conversion to the hotplug state machine kept two mechanisms from
the original code:

 1) The first_init logic which adds the number of online CPUs in a package
    to the refcount. That's wrong because the callbacks are executed for
    all online CPUs.

    Remove it so the refcounting is correct.

 2) The on_each_cpu() call to undo box->init() in the error handling
    path. That's bogus because when the prepare callback fails no box has
    been initialized yet.

    Remove it.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sebastian Siewior <bigeasy@...utronix.de>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: Yasuaki Ishimatsu <yasu.isimatu@...il.com>
Fixes: 1a246b9f58c6 ("perf/x86/intel/uncore: Convert to hotplug state machine")
Link: http://lkml.kernel.org/r/20170131230141.298032324@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/uncore.c | 44 ++++--------------------------------------
 1 file changed, 4 insertions(+), 40 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 8c4ccdc..56c5235 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -764,30 +764,6 @@ static void uncore_pmu_unregister(struct intel_uncore_pmu *pmu)
 	pmu->registered = false;
 }
 
-static void __uncore_exit_boxes(struct intel_uncore_type *type, int cpu)
-{
-	struct intel_uncore_pmu *pmu = type->pmus;
-	struct intel_uncore_box *box;
-	int i, pkg;
-
-	if (pmu) {
-		pkg = topology_physical_package_id(cpu);
-		for (i = 0; i < type->num_boxes; i++, pmu++) {
-			box = pmu->boxes[pkg];
-			if (box)
-				uncore_box_exit(box);
-		}
-	}
-}
-
-static void uncore_exit_boxes(void *dummy)
-{
-	struct intel_uncore_type **types;
-
-	for (types = uncore_msr_uncores; *types; types++)
-		__uncore_exit_boxes(*types++, smp_processor_id());
-}
-
 static void uncore_free_boxes(struct intel_uncore_pmu *pmu)
 {
 	int pkg;
@@ -1078,22 +1054,12 @@ static int uncore_cpu_dying(unsigned int cpu)
 	return 0;
 }
 
-static int first_init;
-
 static int uncore_cpu_starting(unsigned int cpu)
 {
 	struct intel_uncore_type *type, **types = uncore_msr_uncores;
 	struct intel_uncore_pmu *pmu;
 	struct intel_uncore_box *box;
-	int i, pkg, ncpus = 1;
-
-	if (first_init) {
-		/*
-		 * On init we get the number of online cpus in the package
-		 * and set refcount for all of them.
-		 */
-		ncpus = cpumask_weight(topology_core_cpumask(cpu));
-	}
+	int i, pkg;
 
 	pkg = topology_logical_package_id(cpu);
 	for (; *types; types++) {
@@ -1104,7 +1070,7 @@ static int uncore_cpu_starting(unsigned int cpu)
 			if (!box)
 				continue;
 			/* The first cpu on a package activates the box */
-			if (atomic_add_return(ncpus, &box->refcnt) == ncpus)
+			if (atomic_inc_return(&box->refcnt) == 1)
 				uncore_box_init(box);
 		}
 	}
@@ -1408,19 +1374,17 @@ static int __init intel_uncore_init(void)
 					  "perf/x86/intel/uncore:prepare",
 					  uncore_cpu_prepare, NULL);
 	}
-	first_init = 1;
+
 	cpuhp_setup_state(CPUHP_AP_PERF_X86_UNCORE_STARTING,
 			  "perf/x86/uncore:starting",
 			  uncore_cpu_starting, uncore_cpu_dying);
-	first_init = 0;
+
 	cpuhp_setup_state(CPUHP_AP_PERF_X86_UNCORE_ONLINE,
 			  "perf/x86/uncore:online",
 			  uncore_event_cpu_online, uncore_event_cpu_offline);
 	return 0;
 
 err:
-	/* Undo box->init_box() */
-	on_each_cpu_mask(&uncore_cpu_mask, uncore_exit_boxes, NULL, 1);
 	uncore_types_exit(uncore_msr_uncores);
 	uncore_pci_exit();
 	return ret;