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 4ACA1C433F5 for ; Mon, 9 May 2022 20:40:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229672AbiEIUoQ (ORCPT ); Mon, 9 May 2022 16:44:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229655AbiEIUoM (ORCPT ); Mon, 9 May 2022 16:44:12 -0400 Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32A39285AF1 for ; Mon, 9 May 2022 13:40:18 -0700 (PDT) Received: by mail-lj1-x22a.google.com with SMTP id a30so5542275ljq.9 for ; Mon, 09 May 2022 13:40:18 -0700 (PDT) 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=hwKFuevP3nmLw+gVv3xEA1GCgqbzrzuPJGFdNpKxNrk=; b=QiAcwnX+wwS2RSM9hJ+4h8ibJ/QABRHWD8T87QH5/FAsTSw3K4J11tKze3FsZt2Q9p h2XGv6YsIrMENIieGnslhj6D7dwx+ZO4oFS0/fmLv6DDuLrH0BHFAtP3ORfnqSk1/Bps 2semilWcfvpSXBV1sjZ6zH8sPPljieHXvafxkKOK40JHVrLCxUtlMN1Bo35UhKA725fr ujeH392Zu5UOxr7idO9WoR8qZQgxntum5Y8IqcYbeXNzuq3TxgWHqzM1+KOIgNvpcc6T RG4LGKqz1bxiwsYR38s0qrk7KDwGO3YXAQZL0kN4G4hxtbP2zKsF0Oyi20Z/ZvT7fPV3 SyNQ== 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=hwKFuevP3nmLw+gVv3xEA1GCgqbzrzuPJGFdNpKxNrk=; b=iPcrb6dxul+vDeXmJnvpZLU57vbLFALN1KGTRoZcMgxFhDWLwNqXcqzRO7IN3P7mqL APHuAH18qAJz2DypwQ9+e7DzInhd636i3Tfr+1DUkirj9AZRljEhgDV26qFBzgF6SSEL kwepwltRYBMAZUt9RN3Y+2xp8HMVlln9OHDjzrT6PeCNGfjUzw8vJQGfVv17kBrF09BR Wl7+lFghUkf53IoE9PZqGkbgQ7Fbw4s6bB6trQojEm+P3Aj1bIpbuVPlfXtxDFSE1E10 1tf0MnrdyhNPgz+vvjE3qBrTwmC6z3oOQtu4vy76G0vu6xj2TeZuTa7aMKJVmjcSRtMj c7lA== X-Gm-Message-State: AOAM533Rt7XfEi3+NwW7y/5uTWcFREAgdk0RN1aSsMewMXvi++JYZibH CAX1gZ4zwEtDSbLGGYFXrlBgYvqAmHY= X-Google-Smtp-Source: ABdhPJw5syuJ9HPvQXe/GXo94+/cNCoU4/CHzhYySnA5T6zXN05M5euROKo02i4xEgWMDyJZOGEkOw== X-Received: by 2002:a05:651c:243:b0:24a:fb54:31d3 with SMTP id x3-20020a05651c024300b0024afb5431d3mr11764423ljn.242.1652128816082; Mon, 09 May 2022 13:40:16 -0700 (PDT) Received: from localhost.localdomain (88-115-234-153.elisa-laajakaista.fi. [88.115.234.153]) by smtp.gmail.com with ESMTPSA id o25-20020ac24959000000b0047255d21121sm2051961lfi.80.2022.05.09.13.40.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 May 2022 13:40:15 -0700 (PDT) From: Martin Radev To: kvm@vger.kernel.org Cc: will@kernel.org, alexandru.elisei@arm.com, Martin Radev Subject: [PATCH v3 kvmtool 1/6] kvmtool: Add WARN_ONCE macro Date: Mon, 9 May 2022 23:39:35 +0300 Message-Id: <20220509203940.754644-2-martin.b.radev@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220509203940.754644-1-martin.b.radev@gmail.com> References: <20220509203940.754644-1-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. Reviewed-by: Alexandru Elisei 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