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Fri, 16 Oct 2026 06:30:42 -0700 (PDT) Message-ID: Date: Fri, 16 Oct 2026 14:30:41 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 03/25] perf/core: Export output copy helpers for CoreSight To: Leo Yan Cc: Ingo Molnar , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Adrian Hunter , Suzuki K Poulose , Mike Leach , Anshuman Khandual , Yeoreum Yun , Jonathan Corbet , Suyash Mahar , Amir Ayupov References: <20260915-arm_cs_support_aux_sample-v1-0-35cf6f297d20@arm.com> <20260915-arm_cs_support_aux_sample-v1-3-35cf6f297d20@arm.com> Content-Language: en-US From: James Clark In-Reply-To: <20260915-arm_cs_support_aux_sample-v1-3-35cf6f297d20@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 15/09/2026 16:48, Leo Yan wrote: > CoreSight AUX sampling needs perf_output_copy_aux() to copy trace data > into samples and perf_output_copy() to prepend zero bytes when the > available trace is shorter than the requested snapshot. > > Export both helpers so the CoreSight snapshot_aux() callback can use > them when CONFIG_CORESIGHT=m. > > Assisted-by: Codex:gpt-6 > Signed-off-by: Leo Yan > --- > kernel/events/ring_buffer.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c > index 1b1ffe0533e58a9d976d0eb0fc23e09d5936da2b..e69ea5b077a5e94b5b6bb1f4c6f0ca5b8a94a6cc 100644 > --- a/kernel/events/ring_buffer.c > +++ b/kernel/events/ring_buffer.c > @@ -298,6 +298,7 @@ unsigned int perf_output_copy(struct perf_output_handle *handle, > { > return __output_copy(handle, buf, len); > } > +EXPORT_SYMBOL_GPL(perf_output_copy); > > unsigned int perf_output_skip(struct perf_output_handle *handle, > unsigned int len) > @@ -617,6 +618,7 @@ long perf_output_copy_aux(struct perf_output_handle *aux_handle, > > return len; > } > +EXPORT_SYMBOL_GPL(perf_output_copy_aux); > > #define PERF_AUX_GFP (GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY) > > Reviewed-by: James Clark