From patchwork Tue Sep 22 06:07:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 11791565 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4AC34139A for ; Tue, 22 Sep 2020 06:08:33 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1722423A84 for ; Tue, 22 Sep 2020 06:08:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iuUH7P98" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1722423A84 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kKbT4-00088i-TA; Tue, 22 Sep 2020 06:07:58 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kKbT3-00088b-IX for xen-devel@lists.xenproject.org; Tue, 22 Sep 2020 06:07:57 +0000 X-Inumbo-ID: 6ea5e337-fec7-4892-be40-604232c9c58e Received: from mail-qv1-xf42.google.com (unknown [2607:f8b0:4864:20::f42]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 6ea5e337-fec7-4892-be40-604232c9c58e; Tue, 22 Sep 2020 06:07:56 +0000 (UTC) Received: by mail-qv1-xf42.google.com with SMTP id h1so8941090qvo.9 for ; Mon, 21 Sep 2020 23:07:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=YtWt5LT1rZHUieitxqoZL94pXE9Kni8HrVa9DLq6ra8=; b=iuUH7P98MAjsRlYJLK0TJlVvZeCzmYl9RV4YJokXxQqlQv7Wl7kR5ZHCp9MtlOlzKk /1RP01X5p+SM3kTFYgEvk62jz44d/piRqzh8EXdfCfQmyBgRRa3jZ0xJgGBfL2TYW6tn ede/YsJq2RHhP6OjTLHxVUg/RHQ1nexItE8RxNdloYtrMpaYRUzbXPWF7VnOLjpzZums CY/p2InTF6IIF4O6CRVc14nFUBzT4GmCjfKIYzruKsehGb+bT4uXZzhSESh7tX6yA1Cj L4hsw6xW7izWpTL7qRTsyjLb9Wnwa1exn47NZ3C9KFSk/ArtkDmN9SScS3ZUa1kEKfmM R/1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YtWt5LT1rZHUieitxqoZL94pXE9Kni8HrVa9DLq6ra8=; b=nW+a1Fcf51aUtTeB/ab5BOjWoJ3tFK6x2HoQqGf/ITUFAq0S45/im4YF1QlJHljBKT 3m7cemebaiI49RE3HWhHyPYDNDE7s1OVecd8Hd7uXS9FiMdBHiIdjMAJ0ovppsmiZubf yNQPZPcoolkSJs23SanhIWXfRBh5DXHPVAFPkRuZbh0GVH/qjFgc4qJJ4Roak6YJn1wv v1fDaqFRwrPty4POhqx+IVvMbEXoa03f+GjYNlYP1WefINOGuKHY7ISNX2gJ/kz6Rtd8 q1FrkG42Nd3AVSgJZ5y4u3ZkUjSIj3cJoccj0kho0ObKKGuk59vfbSwJRk9uv2XirrkT 8MKg== X-Gm-Message-State: AOAM530PIhwFQi0j7WC0bL4YnhZGEKJtMH6/X0VZPhADRwSFNmYoI5qQ siNkfj5KOXwI11CmRYmc6AA= X-Google-Smtp-Source: ABdhPJzYAkkRErXQKS5nPd9e9nFfwFnEtBGJUL1AQh/5PWzM/3iOlyBSVL9xx1MY6K5RCdOgRUtuYQ== X-Received: by 2002:a0c:8b02:: with SMTP id q2mr4425388qva.48.1600754876169; Mon, 21 Sep 2020 23:07:56 -0700 (PDT) Received: from localhost.localdomain ([2604:1380:45d1:2600::1]) by smtp.gmail.com with ESMTPSA id x3sm12523533qta.53.2020.09.21.23.07.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Sep 2020 23:07:55 -0700 (PDT) From: Nathan Chancellor To: david@redhat.com Cc: akpm@linux-foundation.org, ardb@kernel.org, bhe@redhat.com, dan.j.williams@intel.com, jgg@ziepe.ca, keescook@chromium.org, linux-acpi@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-s390@vger.kernel.org, mhocko@suse.com, pankaj.gupta.linux@gmail.com, richardw.yang@linux.intel.com, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, clang-built-linux@googlegroups.com, Nathan Chancellor Subject: [PATCH] kernel/resource: Fix use of ternary condition in release_mem_region_adjustable Date: Mon, 21 Sep 2020 23:07:48 -0700 Message-Id: <20200922060748.2452056-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200911103459.10306-2-david@redhat.com> References: <20200911103459.10306-2-david@redhat.com> MIME-Version: 1.0 X-Patchwork-Bot: notify X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Clang warns: kernel/resource.c:1281:53: warning: operator '?:' has lower precedence than '|'; '|' will be evaluated first [-Wbitwise-conditional-parentheses] new_res = alloc_resource(GFP_KERNEL | alloc_nofail ? __GFP_NOFAIL : 0); ~~~~~~~~~~~~~~~~~~~~~~~~~ ^ kernel/resource.c:1281:53: note: place parentheses around the '|' expression to silence this warning new_res = alloc_resource(GFP_KERNEL | alloc_nofail ? __GFP_NOFAIL : 0); ~~~~~~~~~~~~~~~~~~~~~~~~~ ^ kernel/resource.c:1281:53: note: place parentheses around the '?:' expression to evaluate it first new_res = alloc_resource(GFP_KERNEL | alloc_nofail ? __GFP_NOFAIL : 0); ^ ( ) 1 warning generated. Add the parentheses as it was clearly intended for the ternary condition to be evaluated first. Fixes: 5fd23bd0d739 ("kernel/resource: make release_mem_region_adjustable() never fail") Link: https://github.com/ClangBuiltLinux/linux/issues/1159 Signed-off-by: Nathan Chancellor Reviewed-by: David Hildenbrand Reviewed-by: Wei Yang --- Presumably, this will be squashed but I included a fixes tag nonetheless. Apologies if this has already been noticed and fixed already, I did not find anything on LKML. kernel/resource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 40ee82f47bf297e31d0c47547cd8f24ede52415a diff --git a/kernel/resource.c b/kernel/resource.c index ca2a666e4317..3ae2f56cc79d 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1278,7 +1278,7 @@ void release_mem_region_adjustable(resource_size_t start, resource_size_t size) * similarly). */ retry: - new_res = alloc_resource(GFP_KERNEL | alloc_nofail ? __GFP_NOFAIL : 0); + new_res = alloc_resource(GFP_KERNEL | (alloc_nofail ? __GFP_NOFAIL : 0)); p = &parent->child; write_lock(&resource_lock);