From nobody Sat Feb 7 15:26:33 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 B9B9C14274 for ; Tue, 6 Feb 2024 19:00:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707246035; cv=none; b=lpHa0/i1cUfojKM/RTX473fbw+4VeRRgQJ1SRMGFkkdcOdoK3XX7BICjP79ugnz/f2pcyf4aqW0v21ImXGA+YHMV4kef84PpwtwVDwNYNjQ4R6m/MozvJPdMMq84ijk/uoDUVJ34S7l84264j9ThY+dYUrlfjccpaUk7gRjtsHE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707246035; c=relaxed/simple; bh=i8Przs01+5+AauKouVnKvrVBH6MR9m6+MAbeEFlDNtM=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=W79KgsjKXqHg4fCMA8DC/f1gw9ghhJniTzyiK5IzJuUmlG1sbXjfhyEQFj3HyQZlepVk5jL8Iv5NCE62sN3cpPpqOYx1sQwVH6xGMntbLkxbiojGpHcRxLw73mXxqcVyY3k9SrAZt0rEuu2NHzCpNAzu3zaibwfq7LYEFsg+ioE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=NHgV8i8r; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="NHgV8i8r" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707246027; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=qlDKbMqWBelqVSfNEbh2M7kUdtgo3q7n46OC/sINoRo=; b=NHgV8i8rTEYOTCdK32YWg8f+MEB06M6kXWudEVkG+ozuOT8SV3G25niScsYCci2/1fY4Fr NOG0vnHAMoh0kMSACqXjuBuI1vKN5HiC0Iw3KR84Qlix2tJjsbtr9jSvCDSSlzdabk/XX5 NEhLplmu6anV8IYIVq/yGtGvs8v4JCA= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-472-mjveR6rZPGOLWpW7CJvbBg-1; Tue, 06 Feb 2024 14:00:26 -0500 X-MC-Unique: mjveR6rZPGOLWpW7CJvbBg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 54F0638212C8; Tue, 6 Feb 2024 19:00:25 +0000 (UTC) Received: from tpad.localdomain (unknown [10.96.133.4]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0D117C0FDCB; Tue, 6 Feb 2024 19:00:25 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id 3F6B0401E1311; Tue, 6 Feb 2024 15:58:07 -0300 (-03) Message-ID: <20240206185710.037579553@redhat.com> User-Agent: quilt/0.67 Date: Tue, 06 Feb 2024 15:49:19 -0300 From: Marcelo Tosatti To: linux-kernel@vger.kernel.org Cc: Daniel Bristot de Oliveira , Juri Lelli , Valentin Schneider , Frederic Weisbecker , Leonardo Bras , Peter Zijlstra , Thomas Gleixner , Marcelo Tosatti Subject: [patch 08/12] arm64 kernel/topology: use smp_call_function_single_fail References: <20240206184911.248214633@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Convert cpu_read_constcnt from smp_call_function_single to smp_call_func_single_fail, which will fail in case the target CPU is tagged as block interference CPU. Signed-off-by: Marcelo Tosatti Index: linux-isolation/arch/arm64/kernel/topology.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- linux-isolation.orig/arch/arm64/kernel/topology.c +++ linux-isolation/arch/arm64/kernel/topology.c @@ -17,6 +17,7 @@ #include #include #include +#include =20 #include #include @@ -280,6 +281,8 @@ static void cpu_read_constcnt(void *val) static inline int counters_read_on_cpu(int cpu, smp_call_func_t func, u64 *val) { + int ret, idx; + /* * Abort call on counterless CPU or when interrupts are * disabled - can lead to deadlock in smp sync call. @@ -290,7 +293,11 @@ int counters_read_on_cpu(int cpu, smp_ca if (WARN_ON_ONCE(irqs_disabled())) return -EPERM; =20 - smp_call_function_single(cpu, func, val, 1); + idx =3D block_interf_srcu_read_lock(); + ret =3D smp_call_function_single_fail(cpu, func, val, 1); + block_interf_srcu_read_unlock(idx); + if (ret) + return ret; =20 return 0; }