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 A8095C433EF for ; Thu, 3 Mar 2022 23:11:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235479AbiCCXMY (ORCPT ); Thu, 3 Mar 2022 18:12:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40512 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235353AbiCCXMU (ORCPT ); Thu, 3 Mar 2022 18:12:20 -0500 Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0DA7D2049 for ; Thu, 3 Mar 2022 15:11:33 -0800 (PST) Received: by mail-lf1-x12b.google.com with SMTP id b9so11121460lfv.7 for ; Thu, 03 Mar 2022 15:11:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=CQqGHruTtbJvIlbmz2/eb9aoqTKQirisELQUTvAZ75I=; b=jh0Fwf1F7dRv2mt3mRxijt/UhCa9RS9i9BJOLqk2jEOa9Pu71Ig6dqvthD2URya+mm nUwodCX+JCVHg/ldR4tw9TF07otsfJjeOWUFZ02puIlYHsFOPaE75dFQePCLJSwYF6X4 1VCI3r2RFGyXDWNg1rAbUDSVUgTbK3NTWCy0YljvyvlitMZZoF+gjQ62yyVJQDWc9c1P qPEHcCMTa21+xPBF5qynntE1b1pJU7IB5HSPWw+Ak2O8l836jpfuvwTZcBqMuf1I4PHW X4nCTATbKm8ExwHUAN6Siz6VixDLqIDAqSlpnu4yT/d/kYyLt1mQcalt/BmOG7AC5tvU fPrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=CQqGHruTtbJvIlbmz2/eb9aoqTKQirisELQUTvAZ75I=; b=vbMSxQHaZD1qZRlC7qTohpjfyQWwIeTJ++s6A6TUDfXUlUYAHc53uL2d1awlYjA4An x3sLHTBjscp1KRpJiBIGVLqs2KLe3JMsN0RAVT3o8zEc+WDCFyXf6k2ahTX3DsDdV/+u k5U6DLOgkldQptf1k2Cbk79F/A/4DkdA9dXplR6O194XB8kTqSpm5I8J6+fmvMamjH3h kuSj8gEsNKhexEVsrYki4wWv6uM4+beAwxyXAjNsCNGERgKI8zdh+f+Hg5wWxR1yBdV+ vLTAAgYJYmFdUt/v0kwQVapdjNB3B/taQm7LB52Aro9JF6RrrPxGvD2OMuem1xe5Rj6U r1qA== X-Gm-Message-State: AOAM531ARHpW1j2uqplQsnXcq9gqWgo1jTXEb3vhvNQ4tsvXQBCLoi8/ 3NfA/6hv7mt+lkaQY7nFu5dhE0HHupc= X-Google-Smtp-Source: ABdhPJwN0VsSUjFXJoWsrpNniDNeaopVnOua+DaetYbqGjNzz9csms93NUBUz0Qo3dMOLLDvzNXNrg== X-Received: by 2002:ac2:54ad:0:b0:443:153e:97fc with SMTP id w13-20020ac254ad000000b00443153e97fcmr22917331lfk.252.1646349091993; Thu, 03 Mar 2022 15:11:31 -0800 (PST) Received: from localhost.localdomain (88-115-234-153.elisa-laajakaista.fi. [88.115.234.153]) by smtp.gmail.com with ESMTPSA id g13-20020a2ea4ad000000b0023382d8819esm725264ljm.69.2022.03.03.15.11.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Mar 2022 15:11:31 -0800 (PST) From: Martin Radev To: kvm@vger.kernel.org, will@kernel.org, julien.thierry.kdev@gmail.com, andre.przywara@arm.com, alexandru.elisei@arm.com Cc: Martin Radev Subject: [PATCH kvmtool 1/5] kvmtool: Add WARN_ONCE macro Date: Fri, 4 Mar 2022 01:10:46 +0200 Message-Id: <20220303231050.2146621-2-martin.b.radev@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220303231050.2146621-1-martin.b.radev@gmail.com> References: <20220303231050.2146621-1-martin.b.radev@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a macro to enable to print a warning only once. This is beneficial for cases where a warning could be helpful for debugging, but still log pollution is preferred not to happen. Signed-off-by: Martin Radev --- include/kvm/util.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/kvm/util.h b/include/kvm/util.h index d76568a..b494548 100644 --- a/include/kvm/util.h +++ b/include/kvm/util.h @@ -82,6 +82,16 @@ do { \ __ret_warn_on; \ }) +#define WARN_ONCE(condition, format, args...) ({ \ + static int __warned; \ + int __ret_warn_on = !!(condition); \ + if (!__warned && __ret_warn_on) { \ + __warned = 1; \ + pr_warning(format, args); \ + } \ + __ret_warn_on; \ +}) + #define MSECS_TO_USECS(s) ((s) * 1000) /* Millisecond sleep */ -- 2.25.1