From mboxrd@z Thu Jan 1 00:00:00 1970 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 183BFEDEC7C for ; Wed, 13 Sep 2023 15:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230013AbjIMPvu (ORCPT ); Wed, 13 Sep 2023 11:51:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbjIMPvt (ORCPT ); Wed, 13 Sep 2023 11:51:49 -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 ESMTP id DDA0A1724 for ; Wed, 13 Sep 2023 08:50:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694620258; 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: in-reply-to:in-reply-to; bh=VnG66QyFsTzARJUHVO8Khm4VR1nzFPa/6kCMVpwGaPA=; b=Ne1CD3Dgx+v/N0NdG4UBEiEYODQubnpQFAGrUvYAiq8VdzqyivzrEeHlzm+u1V3xOd+2Xt C9jCqjVaIjnOopyVWC6kLA6SScG401QZoQTosMpxHi7sGVZ5lob7Lh0Dbva46xucHo1h25 af3gKAuUUNkzVZ9zFhw6gfraKGPQCDI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-424-8fcwpHowNhq13iRSFKUVLg-1; Wed, 13 Sep 2023 11:50:52 -0400 X-MC-Unique: 8fcwpHowNhq13iRSFKUVLg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3F876857A9A; Wed, 13 Sep 2023 15:50:52 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.225.76]) by smtp.corp.redhat.com (Postfix) with SMTP id BE2A940C6EBF; Wed, 13 Sep 2023 15:50:49 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Wed, 13 Sep 2023 17:49:59 +0200 (CEST) Date: Wed, 13 Sep 2023 17:49:56 +0200 From: Oleg Nesterov To: Boqun Feng , Ingo Molnar , Peter Zijlstra , Rik van Riel , Thomas Gleixner , Waiman Long , Will Deacon Cc: Alexey Gladkov , "Eric W. Biederman" , linux-kernel@vger.kernel.org Subject: [PATCH 2/5] seqlock: change __seqprop() to return the function pointer Message-ID: <20230913154956.GA26245@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230913154907.GA26210@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Preparation, see the next patch. This way it is trivial to add the new seqprop's with 2 or more args, and we do not loose the type info. Signed-off-by: Oleg Nesterov --- include/linux/seqlock.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index ac6631bd5706..41e36f8afad4 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -200,9 +200,9 @@ typedef struct seqcount_##lockname { \ } seqcount_##lockname##_t; \ \ static __always_inline seqcount_t * \ -__seqprop_##lockname##_ptr(seqcount_##lockname##_t *s) \ +__seqprop_##lockname##_ptr(const seqcount_##lockname##_t *s) \ { \ - return &s->seqcount; \ + return (void *)&s->seqcount; /* drop const */ \ } \ \ static __always_inline unsigned \ @@ -292,19 +292,19 @@ SEQCOUNT_LOCKNAME(mutex, struct mutex, true, mutex) #define SEQCNT_WW_MUTEX_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name, lock) #define __seqprop_case(s, lockname, prop) \ - seqcount_##lockname##_t: __seqprop_##lockname##_##prop((void *)(s)) + seqcount_##lockname##_t: __seqprop_##lockname##_##prop #define __seqprop(s, prop) _Generic(*(s), \ - seqcount_t: __seqprop_##prop((void *)(s)), \ + seqcount_t: __seqprop_##prop, \ __seqprop_case((s), raw_spinlock, prop), \ __seqprop_case((s), spinlock, prop), \ __seqprop_case((s), rwlock, prop), \ __seqprop_case((s), mutex, prop)) -#define seqprop_ptr(s) __seqprop(s, ptr) -#define seqprop_sequence(s) __seqprop(s, sequence) -#define seqprop_preemptible(s) __seqprop(s, preemptible) -#define seqprop_assert(s) __seqprop(s, assert) +#define seqprop_ptr(s) __seqprop(s, ptr)(s) +#define seqprop_sequence(s) __seqprop(s, sequence)(s) +#define seqprop_preemptible(s) __seqprop(s, preemptible)(s) +#define seqprop_assert(s) __seqprop(s, assert)(s) /** * __read_seqcount_begin() - begin a seqcount_t read section w/o barrier -- 2.25.1.362.g51ebf55