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Thu, 22 Oct 2026 23:08:15 -0700 (PDT) Received: from localhost.localdomain ([98.148.34.5]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-195e5163e1esm4156742c88.3.2026.10.22.23.08.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 23:08:14 -0700 (PDT) From: Hungyu Lin To: rafael@kernel.org, daniel.lezcano@kernel.org Cc: rui.zhang@intel.com, lukasz.luba@arm.com, javi.merino@kernel.org, rostedt@goodmis.org, edubezval@gmail.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Hungyu Lin Subject: [PATCH] thermal: Fix CPU mask truncation in power limit trace event Date: Fri, 23 Oct 2026 06:07:24 +0000 Message-ID: <20261023060724.5691-1-dennylin0707@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit num_possible_cpus() counts CPUs, but CPU IDs need not be contiguous. Using it to size the thermal_power_cpu_limit bitmap can omit CPUs with higher IDs. For example, possible CPUs 0 and 64 produce an eight-byte bitmap on a 64-bit system, dropping CPU 64. Use nr_cpumask_bits for both sizing and copying the bitmap. Fixes: 6828a4711f99 ("thermal: add trace events to the power allocator governor") Signed-off-by: Hungyu Lin --- drivers/thermal/thermal_trace.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/thermal_trace.h b/drivers/thermal/thermal_trace.h index df8f4edd6068..2f953fd8289d 100644 --- a/drivers/thermal/thermal_trace.h +++ b/drivers/thermal/thermal_trace.h @@ -119,7 +119,7 @@ TRACE_EVENT(thermal_power_cpu_limit, TP_ARGS(cpus, freq, cdev_state, power), TP_STRUCT__entry( - __bitmask(cpumask, num_possible_cpus()) + __bitmask(cpumask, nr_cpumask_bits) __field(unsigned int, freq ) __field(unsigned long, cdev_state) __field(u32, power ) @@ -127,7 +127,7 @@ TRACE_EVENT(thermal_power_cpu_limit, TP_fast_assign( __assign_bitmask(cpumask, cpumask_bits(cpus), - num_possible_cpus()); + nr_cpumask_bits); __entry->freq = freq; __entry->cdev_state = cdev_state; __entry->power = power; base-commit: 503bb6e70bbf6304b8113373d09dfffcc4aa9183 -- 2.43.0