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[2620:137:e000::3:2]) by mx.google.com with ESMTPS id f7-20020a6547c7000000b005c5fdbbaadbsi858404pgs.588.2023.12.07.20.38.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Dec 2023 20:38:08 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2; Authentication-Results: mx.google.com; dkim=pass header.i=@linux.dev header.s=key1 header.b=E42pjds6; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.dev Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id 8CC5F80EA95A; Thu, 7 Dec 2023 20:38:05 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1573146AbjLHEhw (ORCPT + 99 others); Thu, 7 Dec 2023 23:37:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229531AbjLHEhu (ORCPT ); Thu, 7 Dec 2023 23:37:50 -0500 Received: from out-181.mta0.migadu.com (out-181.mta0.migadu.com [IPv6:2001:41d0:1004:224b::b5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B72F10DE for ; Thu, 7 Dec 2023 20:37:52 -0800 (PST) Message-ID: <39853044-6139-41ab-87b4-0d9972722226@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1702010270; 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=EVVGC+pDfqN5MkCHTiCHQ6KtlU1POIkUDJH86yPwMsc=; b=E42pjds6jfU/duIckTqDd50zy5v/m8aousSLjjx+BL+ef+wYtfXQP5PoSY7D/hwQ7ysAJo TlRJTpJ6HHlQCAaCJlrnQ39gLfQrVMoK4OfN9fnoJeKnCZshZcHjYWS/1Zhc9fuItpSX10 nmBJryGomnVzTI896UMqHSMaj8jc6yw= Date: Thu, 7 Dec 2023 20:37:40 -0800 MIME-Version: 1.0 Subject: Re: [PATCH bpf-next 1/2] bpf: Add bpf_cpumask_weight() kfunc Content-Language: en-GB To: David Vernet , bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com References: <20231207210843.168466-1-void@manifault.com> <20231207210843.168466-2-void@manifault.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Yonghong Song In-Reply-To: <20231207210843.168466-2-void@manifault.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Thu, 07 Dec 2023 20:38:05 -0800 (PST) On 12/7/23 1:08 PM, David Vernet wrote: > It can be useful to query how many bits are set in a cpumask. For > example, if you want to perform special logic for the last remaining > core that's set in a mask. Let's therefore add a new > bpf_cpumask_weight() kfunc which checks how many bits are set in a mask. > > Signed-off-by: David Vernet Acked-by: Yonghong Song