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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id j3sm20621719pfu.218.2021.10.25.14.21.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Oct 2021 14:21:26 -0700 (PDT) Date: Mon, 25 Oct 2021 14:21:26 -0700 From: Kees Cook To: Yafang Shao Cc: akpm@linux-foundation.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, arnaldo.melo@gmail.com, pmladek@suse.com, peterz@infradead.org, viro@zeniv.linux.org.uk, valentin.schneider@arm.com, qiang.zhang@windriver.com, robdclark@chromium.org, christian@brauner.io, dietmar.eggemann@arm.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, dennis.dalessandro@cornelisnetworks.com, mike.marciniszyn@cornelisnetworks.com, dledford@redhat.com, jgg@ziepe.ca, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, oliver.sang@intel.com, lkp@intel.com, Andrii Nakryiko Subject: Re: [PATCH v6 07/12] samples/bpf/offwaketime_kern: make sched_switch tracepoint args adopt to comm size change Message-ID: <202110251421.0CD56F8@keescook> References: <20211025083315.4752-1-laoar.shao@gmail.com> <20211025083315.4752-8-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211025083315.4752-8-laoar.shao@gmail.com> X-Stat-Signature: 6oc4mt34fnggzifmgw37d75umut3hcon Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=ZZAE5vvB; spf=pass (imf14.hostedemail.com: domain of keescook@chromium.org designates 209.85.215.179 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 101586001991 X-HE-Tag: 1635196888-845495 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 25, 2021 at 08:33:10AM +0000, Yafang Shao wrote: > The sched:sched_switch tracepoint is derived from kernel, we should make > its args compitable with the kernel. > > Signed-off-by: Yafang Shao > Cc: Mathieu Desnoyers > Cc: Arnaldo Carvalho de Melo > Cc: Andrii Nakryiko > Cc: Peter Zijlstra > Cc: Steven Rostedt > Cc: Al Viro > Cc: Kees Cook > Cc: Petr Mladek > --- > samples/bpf/offwaketime_kern.c | 4 ++-- Seems this should be merged with the prior bpf samples patch? -Kees > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/samples/bpf/offwaketime_kern.c b/samples/bpf/offwaketime_kern.c > index 4866afd054da..eb4d94742e6b 100644 > --- a/samples/bpf/offwaketime_kern.c > +++ b/samples/bpf/offwaketime_kern.c > @@ -113,11 +113,11 @@ static inline int update_counts(void *ctx, u32 pid, u64 delta) > /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */ > struct sched_switch_args { > unsigned long long pad; > - char prev_comm[16]; > + char prev_comm[TASK_COMM_LEN]; > int prev_pid; > int prev_prio; > long long prev_state; > - char next_comm[16]; > + char next_comm[TASK_COMM_LEN]; > int next_pid; > int next_prio; > }; > -- > 2.17.1 > -- Kees Cook