From patchwork Mon Dec 2 12:27:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Patchwork-Id: 13890513 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C08A7D78312 for ; Mon, 2 Dec 2024 12:28:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tI5WZ-0006N6-Uc; Mon, 02 Dec 2024 07:27:35 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tI5WX-0006Mp-Lw for qemu-devel@nongnu.org; Mon, 02 Dec 2024 07:27:33 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tI5WV-0004Zz-L2 for qemu-devel@nongnu.org; Mon, 02 Dec 2024 07:27:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1733142449; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hvZcOCuHqlQ+KugXG0gYzlGUPxFnOSpG7EH1+lC1fW8=; b=X6e7mrzSWXdrGJ+1tnoiHThGCamhLTE96Yc8qa3FVpevITHrcjKUSU79NRYhT0nmAAUtKN Dw0OU1rGNKuaJI+FJBVMTChW0zulfsaaDukAGRczJ0J+AMyR+nBSPFkUNO4/QGgJ5y1OJF C0mD3Nj0KvS+xo24oDowHranQ7rWmoQ= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-392-5uPES4iPNsCLME6USGzn4Q-1; Mon, 02 Dec 2024 07:27:26 -0500 X-MC-Unique: 5uPES4iPNsCLME6USGzn4Q-1 X-Mimecast-MFC-AGG-ID: 5uPES4iPNsCLME6USGzn4Q Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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 mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 6959E19560A3; Mon, 2 Dec 2024 12:27:25 +0000 (UTC) Received: from localhost (unknown [10.39.208.11]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 62EE230000DF; Mon, 2 Dec 2024 12:27:23 +0000 (UTC) From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , peter.maydell@linaro.org, Roman Penyaev Subject: [PULL 2/2] chardev/char-mux: make boolean bit check instead of find_next_bit() Date: Mon, 2 Dec 2024 16:27:09 +0400 Message-ID: <20241202122709.100177-3-marcandre.lureau@redhat.com> In-Reply-To: <20241202122709.100177-1-marcandre.lureau@redhat.com> References: <20241202122709.100177-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.996, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Roman Penyaev This patch simplifies (and makes less confusing) bit checks by replacing `find_next_bit()` calls with boolean AND operation. Resolves: Coverity CID 1563776 Signed-off-by: Roman Penyaev Reviewed-by: "Marc-André Lureau" Cc: Peter Maydell Cc: Paolo Bonzini Reviewed-by: Clément Mathieu--Drif Cc: qemu-devel@nongnu.org Message-ID: <20241129103239.464061-3-r.peniaev@gmail.com> --- chardev/char-mux.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/chardev/char-mux.c b/chardev/char-mux.c index 9d67b8bd9a..e13042d381 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -336,15 +336,12 @@ bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b, bool mux_chr_detach_frontend(MuxChardev *d, unsigned int tag) { - unsigned int bit; - - bit = find_next_bit(&d->mux_bitset, MAX_MUX, tag); - if (bit != tag) { + if (!(d->mux_bitset & (1ul << tag))) { return false; } - d->mux_bitset &= ~(1ul << bit); - d->backends[bit] = NULL; + d->mux_bitset &= ~(1ul << tag); + d->backends[tag] = NULL; return true; } @@ -353,7 +350,7 @@ void mux_set_focus(Chardev *chr, unsigned int focus) { MuxChardev *d = MUX_CHARDEV(chr); - assert(find_next_bit(&d->mux_bitset, MAX_MUX, focus) == focus); + assert(d->mux_bitset & (1ul << focus)); if (d->focus != -1) { mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_OUT);