From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 3AF7A3858D35 for ; Mon, 19 Feb 2024 19:43:10 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 3AF7A3858D35 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 3AF7A3858D35 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708371791; cv=none; b=dxfJxM4tRP+b6RBkYJ6yq475LeICWNlxdluH2fJ/EImNEaQ//4QoGsJiBqo+qjx902YjhT/iw4BxaIsuUu0QNtPqge6HIRDs40NEJPwQ8nu6WBA0rL+rOt9PhWjqp9SDR+o+zof3vy/h9BYN+rsT05uWNng3A2DGAF2022ULqpU= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708371791; c=relaxed/simple; bh=iDBcbV3+raBFAKE6lhBtligESBYOblnDxvhYohME9m0=; h=DKIM-Signature:From:To:Subject:Date:Message-ID:MIME-Version; b=X+PFOe01tTTRKWIXFNYX4OzE3N5VKOLOF3TANDRmjoxKl8d5JX2z2jh5w4R4Qx0y0aHJ8fArgemjOsmBE/hNhmm+tbF0B5AELX6CYN5K0Lr3XiwtqpttZlyXDYipbsJ98kQ5QJN1bZ1AMks2isEBtEGAPt3g62cV/QMh1xHQxHs= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1708371790; 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=K635vCaEhVg129cB4YgvWxk4ILNKLCU9m2RTXm/mNJ4=; b=aTfkupb00T4hLGevgmppJjrE/SROa2qpc7tgBIoJtaeLbhc55rHvJHxGr9gPxEoCSoPxcd vsnCcXncFlZeimsuSZSmqFKqVSC+Rz1pifY83etCqFXAJ+dZkIz9R+I/DFIwm1Tw3/sHRX 5P/t6mgxWD1STSDO6ZpwT6DBwwWVLgc= 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-416-jn64iNSFMHOXrsRQUHwYmQ-1; Mon, 19 Feb 2024 14:43:06 -0500 X-MC-Unique: jn64iNSFMHOXrsRQUHwYmQ-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 4D2DC3C14942; Mon, 19 Feb 2024 19:43:06 +0000 (UTC) Received: from greed.delorie.com (unknown [10.22.8.101]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 38528C185C3; Mon, 19 Feb 2024 19:43:06 +0000 (UTC) Received: from greed.delorie.com.redhat.com (localhost [127.0.0.1]) by greed.delorie.com (8.15.2/8.15.2) with ESMTP id 41JJh5Hj399944; Mon, 19 Feb 2024 14:43:05 -0500 From: DJ Delorie To: Michael Jeanson Cc: libc-alpha@sourceware.org, mathieu.desnoyers@efficios.com Subject: Re: [PATCH v8 3/8] nptl: Add public __rseq_feature_size symbol In-Reply-To: Date: Mon, 19 Feb 2024 14:43:05 -0500 Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Michael Jeanson writes: > Not sure about the 'change it' part, this minimum value is in the ABI and > should never change. Do you mean explaining why the 'feature_size' would change? Dunno, I'm not familiar enough with the kernel side of this. *Is* it something the user can change? Does it depend on kernel versions? Is there some way of adding a user-specified region to this? I was more worried about "magic numbers" than what they mean. As for "it's ABI", the ABI used to have only 8 bytes in that struct ;-)