linux-kernel - [tip: perf/core] perf: Fix the nr_addr

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Message-ID: <170075245640.398.10957692681465500006.tip-bot2@tip-bot2>
Date:   Thu, 23 Nov 2023 15:14:16 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Richter <tmricht@...ux.ibm.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf: Fix the nr_addr_filters fix

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     388a1fb7da6aaa1970c7e2a7d7fcd983a87a8484
Gitweb:        https://git.kernel.org/tip/388a1fb7da6aaa1970c7e2a7d7fcd983a87a8484
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Wed, 22 Nov 2023 11:07:56 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 23 Nov 2023 16:08:31 +01:00

perf: Fix the nr_addr_filters fix

Thomas reported that commit 652ffc2104ec ("perf/core: Fix narrow
startup race when creating the perf nr_addr_filters sysfs file") made
the entire attribute group vanish, instead of only the nr_addr_filters
attribute.

Additionally a stray return.

Insufficient coffee was involved with both writing and merging the
patch.

Fixes: 652ffc2104ec ("perf/core: Fix narrow startup race when creating the perf nr_addr_filters sysfs file")
Reported-by: Thomas Richter <tmricht@...ux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Thomas Richter <tmricht@...ux.ibm.com>
Link: https://lkml.kernel.org/r/20231122100756.GP8262@noisy.programming.kicks-ass.net
---
 kernel/events/core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4f0c45a..59b332c 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11417,12 +11417,10 @@ static umode_t pmu_dev_is_visible(struct kobject *kobj, struct attribute *a, int
 	struct device *dev = kobj_to_dev(kobj);
 	struct pmu *pmu = dev_get_drvdata(dev);
 
-	if (!pmu->nr_addr_filters)
+	if (n == 2 && !pmu->nr_addr_filters)
 		return 0;
 
 	return a->mode;
-
-	return 0;
 }
 
 static struct attribute_group pmu_dev_attr_group = {