From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EDB1E383C86; Wed, 30 Sep 2026 18:10:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790791810; cv=none; b=an28S6wJFqy8bL7mnOfgu3DbBe1fzvs5JssuMDglGIhx+1PERx2sxCXqQRZog1+nc+C5c8TH9uz6zpCbBfP7tKrzc16RttMylE+BwwoexeycZmOPYFmL9npw1GX5f+BFMDep1er74aVcj430c/MBkBrqVNqZKxbyJIzYoNa4Y/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790791810; c=relaxed/simple; bh=UTATIEZ306u9QF/YMNVf5Lcm9twNxSgmw5w7CifWUr8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=K8KVfQz/qGoBLgQnjmYMod00f9wzGoq4Ip5u+b0YD6TLNG09ESUnaCXr3HhCIrZv9MDW1OdGek1+lrlEnmbi85MUqSuUndc/78d2hoXqg6Q4teqToDRMXWb6/0vnOW52ck0vHC3ObG0RQo3W96xWqEo3bJbAD3LZS2jweTwG+bI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JoQ1Ueg3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JoQ1Ueg3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23DCA1F000FF; Wed, 30 Sep 2026 18:10:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790791808; bh=NG5j8CM+0BaYGMDH9vytdTLXcA3ZLH+wklIiCpQSAO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JoQ1Ueg3DiFMu/tVCkNm8ForKSCnhYMsW7ECxPtTfNHyWCwbWO6sG/XoTPqfG47aY n/3++ucmdqyB19IuKwTdS9590Lf22gbqfVD91vCYyBLM0iGpAR7JD6w6FxesIc6SSh 0/EVJcT+GCKSnB+dirkaTtEY6SbdmHFUc0mmiO34= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sasha Levin Subject: [PATCH 5.15 433/752] Revert "perf cs-etm: Flush thread stacks after decoder reset" Date: Wed, 30 Sep 2026 17:25:03 +0200 Message-ID: <20260930152407.654347332@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ This reverts commit 455f6895facd943bbbe8ffc7a191eda038276b31. Signed-off-by: Sasha Levin --- tools/perf/util/cs-etm.c | 45 ---------------------------------------- 1 file changed, 45 deletions(-) diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index be5a2e2d226d8..6fa698186f0b6 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -1637,45 +1637,6 @@ static int cs_etm__end_block(struct cs_etm_queue *etmq, return 0; } - -static int cs_etm__flush_stack_cb(struct thread *thread, - void *data __maybe_unused) -{ - thread_stack__flush(thread); - return 0; -} - -static void cs_etm__flush_machine_stack(struct cs_etm_queue *etmq, pid_t pid) -{ - struct machine *machine; - - machine = machines__find(&etmq->etm->session->machines, pid); - if (machine) - machine__for_each_thread(machine, cs_etm__flush_stack_cb, NULL); -} - -static void cs_etm__flush_all_stack(struct cs_etm_queue *etmq) -{ - enum cs_etm_pid_fmt pid_fmt = cs_etm__get_pid_fmt(etmq); - - if (!etmq->etm->synth_opts.last_branch) - return; - - switch (pid_fmt) { - case CS_ETM_PIDFMT_CTXTID2: - /* Clear the guest stack if virtualization is supported */ - cs_etm__flush_machine_stack(etmq, DEFAULT_GUEST_KERNEL_ID); - fallthrough; - case CS_ETM_PIDFMT_CTXTID: - cs_etm__flush_machine_stack(etmq, HOST_KERNEL_ID); - break; - case CS_ETM_PIDFMT_NONE: - default: - break; - - } -} - /* * cs_etm__get_data_block: Fetch a block from the auxtrace_buffer queue * if need be. @@ -1698,12 +1659,6 @@ static int cs_etm__get_data_block(struct cs_etm_queue *etmq) ret = cs_etm_decoder__reset(etmq->decoder); if (ret) return ret; - - /* - * Since the decoder is reset, this causes a global trace - * discontinuity. Flush all thread stacks. - */ - cs_etm__flush_all_stack(etmq); } return etmq->buf_len; -- 2.53.0