From nobody Fri Sep 12 14:40:20 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD431C77B75 for ; Mon, 15 May 2023 18:07:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbjEOSHS (ORCPT ); Mon, 15 May 2023 14:07:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243789AbjEOSGl (ORCPT ); Mon, 15 May 2023 14:06:41 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 931F51F308 for ; Mon, 15 May 2023 11:03:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684173826; 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=6QfpHdKEKCW5B9XIpfLylgQS/cYcg8nRN+BFpTs113M=; b=PwGwixU1u4jEM7y3smS1NzsqGZS8r4lSJE0oMG2AGqz/WvDT+gD2EW5fexitCgPlgTFOEx 1mCvi6l1hKKHAUh8VlR+WVy+jBuVJoyZM42KGI2Tm352XVyD31wfno9LI3CHSHNgVTt5rT Lsq/28IMIpRs1BmaFkBuSngZPtkmxsQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-222-4rDDS1EbMJedd7bEsqx9QA-1; Mon, 15 May 2023 14:03:44 -0400 X-MC-Unique: 4rDDS1EbMJedd7bEsqx9QA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2A8703C0ED50; Mon, 15 May 2023 18:03:43 +0000 (UTC) Received: from tpad.localdomain (ovpn-112-4.gru2.redhat.com [10.97.112.4]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EF5352026D16; Mon, 15 May 2023 18:03:42 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id 48EDC4161E525; Mon, 15 May 2023 15:02:17 -0300 (-03) Message-ID: <20230515180138.491271416@redhat.com> User-Agent: quilt/0.67 Date: Mon, 15 May 2023 15:00:18 -0300 From: Marcelo Tosatti To: Christoph Lameter Cc: Aaron Tomlin , Frederic Weisbecker , Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Russell King , Huacai Chen , Heiko Carstens , x86@kernel.org, Vlastimil Babka , Michal Hocko , Marcelo Tosatti Subject: [PATCH v8 03/13] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function References: <20230515180015.016409657@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Goal is to have vmstat_shepherd to transfer from per-CPU counters to global counters remotely. For this, an atomic this_cpu_cmpxchg is necessary. Following the kernel convention for cmpxchg/cmpxchg_local, add this_cpu_cmpxchg_local helpers to Loongarch. Signed-off-by: Marcelo Tosatti --- Index: linux-vmstat-remote/arch/loongarch/include/asm/percpu.h =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-vmstat-remote.orig/arch/loongarch/include/asm/percpu.h +++ linux-vmstat-remote/arch/loongarch/include/asm/percpu.h @@ -150,6 +150,16 @@ static inline unsigned long __percpu_xch } =20 /* this_cpu_cmpxchg */ +#define _protect_cmpxchg(pcp, o, n) \ +({ \ + typeof(*raw_cpu_ptr(&(pcp))) __ret; \ + preempt_disable_notrace(); \ + __ret =3D cmpxchg(raw_cpu_ptr(&(pcp)), o, n); \ + preempt_enable_notrace(); \ + __ret; \ +}) + +/* this_cpu_cmpxchg_local */ #define _protect_cmpxchg_local(pcp, o, n) \ ({ \ typeof(*raw_cpu_ptr(&(pcp))) __ret; \ @@ -222,10 +232,15 @@ do { \ #define this_cpu_xchg_4(pcp, val) _percpu_xchg(pcp, val) #define this_cpu_xchg_8(pcp, val) _percpu_xchg(pcp, val) =20 -#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) -#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_local_1(ptr, o, n) _protect_cmpxchg_local(ptr, o,= n) +#define this_cpu_cmpxchg_local_2(ptr, o, n) _protect_cmpxchg_local(ptr, o,= n) +#define this_cpu_cmpxchg_local_4(ptr, o, n) _protect_cmpxchg_local(ptr, o,= n) +#define this_cpu_cmpxchg_local_8(ptr, o, n) _protect_cmpxchg_local(ptr, o,= n) + +#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg(ptr, o, n) +#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg(ptr, o, n) =20 #include