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[81.98.219.239]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45380705351sm51727455e9.0.2025.06.26.08.53.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jun 2025 08:53:20 -0700 (PDT) From: Dylan Yudaken To: mathieu.desnoyers@efficios.com, paulmck@kernel.org Cc: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Dylan Yudaken Subject: [PATCH 1/2] membarrier: allow cpu_id to be set on more commands Date: Thu, 26 Jun 2025 16:52:56 +0100 Message-ID: <20250626155257.81256-2-dyudaken@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250626155257.81256-1-dyudaken@gmail.com> References: <20250626155257.81256-1-dyudaken@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" No reason to not allow MEMBARRIER_CMD_FLAG_CPU on MEMBARRIER_CMD_PRIVATE_EXPEDITED or MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE. If it is known specifically what cpu you want to interrupt then there is a decent efficiency saving in not interrupting all the other ones. Also - the code already works as is for them. Signed-off-by: Dylan Yudaken --- kernel/sched/membarrier.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c index 809194cd779f..def6d4094ad6 100644 --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -595,7 +595,9 @@ static int membarrier_get_registrations(void) * contains the CPU on which to interrupt (=3D restart) * the RSEQ critical section. * @cpu_id: if @flags =3D=3D MEMBARRIER_CMD_FLAG_CPU, indicates the cpu on= which - * RSEQ CS should be interrupted (@cmd must be + * RSEQ CS should be interrupted (@cmd must be one of + * MEMBARRIER_CMD_PRIVATE_EXPEDITED, + * MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE, * MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ). * * If this system call is not implemented, -ENOSYS is returned. If the @@ -625,6 +627,8 @@ static int membarrier_get_registrations(void) SYSCALL_DEFINE3(membarrier, int, cmd, unsigned int, flags, int, cpu_id) { switch (cmd) { + case MEMBARRIER_CMD_PRIVATE_EXPEDITED: + case MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE: case MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ: if (unlikely(flags && flags !=3D MEMBARRIER_CMD_FLAG_CPU)) return -EINVAL; --=20 2.49.0