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McKenney" , Petr Mladek , Kees Cook , David Disseldorp Subject: [PATCH 6/7] hw_breakpoint_test: fix test_many_cpus failure on large systems Date: Thu, 14 May 2026 05:04:54 +0000 Message-Id: <20260514050455.2954509-7-justin.he@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260514050455.2954509-1-justin.he@arm.com> References: <20260514050455.2954509-1-justin.he@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3649B40006 X-Rspam-User: X-Stat-Signature: 5ybeg1atfk19febuygu1wuxf5og3muuf X-HE-Tag: 1778735286-873514 X-HE-Meta: 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 zkN4sDsb 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On systems with many CPUs (e.g. 128 cores x 4 HW breakpoint slots = 512 = MAX_TEST_BREAKPOINTS), test_many_cpus() advances idx to MAX_TEST_BREAKPOINTS after the last fill_bp_slots(). The subsequent register_test_bp() call hits WARN_ON(idx >= MAX_TEST_BREAKPOINTS), returns NULL, and the -ENOSPC expectation fails. Bail out of the loop when idx reaches the limit. Earlier iterations already validate the NOSPC path on other CPUs. To: Peter Zijlstra To: Ingo Molnar To: Arnaldo Carvalho de Melo To: Namhyung Kim To: Mark Rutland To: Alexander Shishkin To: Jiri Olsa To: Ian Rogers To: Adrian Hunter To: James Clark Cc: linux-perf-users@vger.kernel.org Signed-off-by: Jia He --- kernel/events/hw_breakpoint_test.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/events/hw_breakpoint_test.c b/kernel/events/hw_breakpoint_test.c index 2cfeeecf8de9..943d040d2224 100644 --- a/kernel/events/hw_breakpoint_test.c +++ b/kernel/events/hw_breakpoint_test.c @@ -137,6 +137,9 @@ static void test_many_cpus(struct kunit *test) for_each_online_cpu(cpu) { bool do_continue = fill_bp_slots(test, &idx, cpu, NULL, 0); + if (idx >= MAX_TEST_BREAKPOINTS) + break; + TEST_EXPECT_NOSPC(register_test_bp(cpu, NULL, idx)); if (!do_continue) break; -- 2.34.1