From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794291996; b=RlhqRPWir/sArfXK75x0iqaX11dd4ls/uqtEgi/pP5wYhV0vTQ55LBZGmellgiE5l3gA TPKUrolNJIHvIL0HneeCLPhoqNnDI1ByEwyYZWkjG1EwEetaeWI72WleEwDpUO7lVlK7D F3+NWBJRrt+7bMbE1a3XFaQl0JW1lwj/Hd7Sel5kp/kxnFTy2Zlh7msmk7kvtZRDgUS4A kD8v0vbWI3x0DUN6s1h965DJBXtj/eBevaQ8GlfqSF46071XZBC+Zjf5uutPNq7QOan8N bE6cGRh8pNKOwas3fo0CilnqpYkdossXAKScWVB6+DWfdONvZ5qMXO4TnStnoXqxLQg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794291996; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=ojUYDTL9NZGqTuzOAcNPqIkucjU3jwnh2aKBI9TK0GA=; b=TSFBpZWVbgsgsYvrNSyV9ZF6ftvSfwFNoyNvy0VqUUj+exRVKrz3lsCNQwF25zhra8Oo oO6oxOAmmTFGdUbj23urjEatCNcO/YA2OlfkAoJsjXoNDqsP0W9RzDHfNVTdG0R5OjSsd 1+yk1tfZGMiV453mpsrI7xldurSkRpn5mhOoPseiYAW7dg7cVQkhoEFPfNJWM+x9Gvf91 YgjWc+AGuTbdDZ2JcGZ8tk+xvNO+CwEaSlLUMiDa5DLr0OAUAn6NUIaYhH+UapSV9pCsC RmvfV56KW3yE6z+uYY7X9J8hnW4N4nzYj6mLPKhr0iIqks5hrhZgMuWHo4G1G4ieWzw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=WdU61FaQ; arc=none smtp.remote-ip=91.218.175.172 Received: from mta0.migadu.com (out-172.mta0.migadu.com [91.218.175.172]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2FE1D606A31C for ; Tue, 10 Nov 2026 06:26:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 2FE1D606A31C Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=WdU61FaQ X-Envelope-To: linux-kselftest@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=2HOEpaZ+eKTnq4zhEkTJPCUHP9kr5u1Ujd+ujWJoYoQ=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794291992; v=1; x=1794896792; b=WdU61FaQHjjd+fNp26rLGbCEqgA5/u8zkoKZsSU1t1/zhTcptpk6SVuJ/554HaYq1dFsF/fZ hlyvEUXb1a67JBEwwIRsjpDXipInThcVHcM85eucGEsQpKU4/49cXf8x8EKMUgL5Ux23HSBkSNG zICfEJpoIGHTqAeSxwxzSoOU= X-Envelope-To: linux-kselftest@vger.kernel.org Received: by mta11.migadu.com with ESMTPS id 21ddd5e6cb307c28; Tue, 10 Nov 2026 06:26:31 +0000 X-Mizu-Trace-ID: 21ddd5e6cb307c28 X-Migadu-Flow: FLOW_OUT Date: Tue, 10 Nov 2026 14:26:13 +0800 From: Hangbin Liu To: Jingjing Xu Cc: netdev@vger.kernel.org, willemb@google.com, kuba@kernel.org, shuah@kernel.org, linux-kselftest@vger.kernel.org, davem@davemloft.net, edumazet@kernel.org, pabeni@redhat.com, horms@kernel.org Subject: Re: [PATCH net] selftests: net: udpgso_bench_tx: honor CPU zero in the affinity option Message-ID: References: <20261110033920.49267-1-xujingjing@cmss.chinamobile.com> X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261110033920.49267-1-xujingjing@cmss.chinamobile.com> On Tue, Nov 10, 2026 at 03:39:20AM +0000, Jingjing Xu wrote: > The -C option accepts a CPU number, with -1 meaning that affinity was > not requested. Testing cfg_cpu > 0 ignores an explicit -C 0, so the > benchmark can run on other CPUs despite the requested pinning. > > Accept zero as well, keeping the negative default unchanged. > > Discovered by Codex-assisted code inspection. Validated before and after > the fix with loopback UDP traffic, inheriting CPUs 0 and 1 and reading > the process affinity with sched_getaffinity(). Before the fix, -C 0 > retains both CPUs; after it, only CPU 0 is allowed. The default and -C 1 > cases retain their expected masks. Built with GCC using -Wall -Werror. > > No kernel instrumentation or fault injection was used. > > Fixes: 3a687bef148d ("selftests: udp gso benchmark") > Signed-off-by: Jingjing Xu > --- > tools/testing/selftests/net/udpgso_bench_tx.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/net/udpgso_bench_tx.c b/tools/testing/selftests/net/udpgso_bench_tx.c > index 86d80cce55b4..797c8d6800f0 100644 > --- a/tools/testing/selftests/net/udpgso_bench_tx.c > +++ b/tools/testing/selftests/net/udpgso_bench_tx.c > @@ -642,7 +642,7 @@ int main(int argc, char **argv) > > parse_opts(argc, argv); > > - if (cfg_cpu > 0) > + if (cfg_cpu >= 0) > set_cpu(cfg_cpu); > > for (i = 0; i < sizeof(buf[0]); i++) > base-commit: 30c71476d842b094651bd7712f6c8ee8716147d0 > -- > 2.53.0 > Reviewed-by: Hangbin Liu