From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793904035; b=zXlyKQzbH9Dvl+EAGqZ0828hP//KoaLa8gHETO5V9U/VNQUmC20B5XIauvlBXbsIU9ls Hsa9WyFu6RpIetxVOhogPMVQykuwWInYM/M/TuArqFrnNvhbdSmJroL1EjieWSSAfhXMz l/249lLXDhft+MPc0pGeqURePdTECC97nEIg4+Qttjkydup9EZj8UbJzKC6yWUVozluWx pk68Pn8ayLHVqGwuTgIDBofhNwjk3xyzjCXMPLa/eBdLtiuySQAmgZusXcfwwAYxZ5eb6 P1Rpf5RM9iO8zHTy4Pzb1Uu/xAysq95s0/Lgkm0ptX3zghOdgYJTdLum3KFYE2rgHoA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793904035; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=XdNIE0XN9APhwnsmlcyUqcIzn832C3AoKIbUq8A2c7o=; b=WrQ+vzUEGZJ0QCGyEPaMFYWsR8z9t9hO/BVkVnu/DqHviW2wGLhMR48yrjqYv+gO9pg7 2/USQu+SROBO1iReACebt7ARXcQJk/Qph1u0Krq0Vx4nbLAjDAmxv2bhKI3qfCYOEpNCS 4pvvGZLIRXr2lqRxDsBJMVUngP7fNlR9uC5iq/jCGTXzCmtahEEWKDsx0t52EtzqqOhXx fuRcfUdkYiN13hTzY5sgJ2sVdiGhUXm63Udi7LWu/AuNOXIde8CWjoJ3glgmwzcby44Ae pwDTyQoaYXeHwOyJYZqlE/S67X1XjJtgx28au8m4h3hYGJi3bXWJg+A/e4E/5HoN89g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=C5IcY5B5; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 87241606A33F for ; Thu, 5 Nov 2026 18:40:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=C5IcY5B5 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 146BE1F00A16; Thu, 5 Nov 2026 18:40:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793904035; bh=XdNIE0XN9APhwnsmlcyUqcIzn832C3AoKIbUq8A2c7o=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=C5IcY5B5jjBkX4U7mMpBcIAHqmKwpvhB7qc80ckWAXWslkB+bkIYman0xUWggHnCw indYqZlSyOY0edaVy1KoPKJqtXbVoQ5j1X75oTjpYn2JU64YEb/uL0/6GZLJNt1ttY mD39Cw859lnuaJtFyABITk44OMv31bAMuaTjgtLTwjixYn73jWvlH5rFNSexzuOhri Xhf4oCrUCJb2z5WdLIsb0II3mfbHmTJPGjKrKi+KCUKLP5SjkuLwI0HeQSzQ9a5WwH 9G8tKwizvjZ1EAvBo+HTXwpjBl9vVgb+HGcLIMeq1OViGt/1hkh1Wx3gnkQgCi9I7/ nVtDEmt7GNFuw== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH 19/47] perf/arm_pmu: Move CPUHP_AP_PERF_ARM_STARTING post stop_machine() Reply-To: sashiko-reviews@lists.linux.dev To: "Frederic Weisbecker" Cc: linux-perf-users@vger.kernel.org In-Reply-To: <20261105163045.38862-20-frederic@kernel.org> References: <20261105163045.38862-1-frederic@kernel.org> <20261105163045.38862-20-frederic@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 05 Nov 2026 18:40:34 +0000 X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > Between CPUHP_TEARDOWN_CPU and CPUHP_AP_OFFLINE, stop_machine executes > all the teardown callbacks while stopping all CPUs in the system. This > doesn't mix-up well with running RT or isolated tasks. >=20 > In order to transition smoothly from global stop_machine to finer > grained synchronization between teardown callbacks and the other CPUs, > a new stop machine post function has been introduced to be executed > after the main one with IRQs still disabled while other CPUs can exit > stop_machine(). >=20 > The teardown callback here just disables the IRQs for each PMUs, which > shouldn't expose any specific race while other CPUs are running. >=20 > Move it to post stop_machine() accordingly. >=20 > Signed-off-by: Frederic Weisbecker Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261105163045.3886= 2-1-frederic@kernel.org?part=3D19