From patchwork Mon May 18 17:36:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 225850 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAF41C433E1 for ; Mon, 18 May 2020 17:44:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B174620715 for ; Mon, 18 May 2020 17:44:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589823881; bh=bDA3ORR6saXc6yEWqMEoxIh7cCsWEQXRzhmnx+QhUaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fZ6wwSIXldKLMkiRTcvhyOW39/h/sXf4vDstSbfgrTm5YChVYG0mL7Jy6CROMOS1H G+by3OvCgyFIphIsUsLBKbJ1QaXPH+mDZfHWCjTFKnd9iUNdovWqcRRFm+LAbEhTLj crNfZ4VZmH+AoCll319lvCgz1iEBWGuL0x2a5o50= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729093AbgERRol (ORCPT ); Mon, 18 May 2020 13:44:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:42998 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729275AbgERRof (ORCPT ); Mon, 18 May 2020 13:44:35 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D276620715; Mon, 18 May 2020 17:44:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589823875; bh=bDA3ORR6saXc6yEWqMEoxIh7cCsWEQXRzhmnx+QhUaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pnK/ISPTGYLn8JgxCkgPbt44GiQRDG7k3OUWtJD+eM5d+M1KCwh+kZN0HeLiu2wCC WSrM59BDmUYhL7E94H+DA0rZeOgjoYT0gFCipzK0AJFyGd/Rk7AUsi42Tz6lHd7SXP Sazo8yNSBeKmFjnXOjDZakx58Dyds0Z4/iqMiznE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Torvalds Subject: [PATCH 4.9 64/90] gcc-10: disable zero-length-bounds warning for now Date: Mon, 18 May 2020 19:36:42 +0200 Message-Id: <20200518173504.147510115@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518173450.930655662@linuxfoundation.org> References: <20200518173450.930655662@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Linus Torvalds commit 5c45de21a2223fe46cf9488c99a7fbcf01527670 upstream. This is a fine warning, but we still have a number of zero-length arrays in the kernel that come from the traditional gcc extension. Yes, they are getting converted to flexible arrays, but in the meantime the gcc-10 warning about zero-length bounds is very verbose, and is hiding other issues. I missed one actual build failure because it was hidden among hundreds of lines of warning. Thankfully I caught it on the second go before pushing things out, but it convinced me that I really need to disable the new warnings for now. We'll hopefully be all done with our conversion to flexible arrays in the not too distant future, and we can then re-enable this warning. Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- Makefile | 3 +++ 1 file changed, 3 insertions(+) --- a/Makefile +++ b/Makefile @@ -797,6 +797,9 @@ KBUILD_CFLAGS += $(call cc-disable-warni # disable stringop warnings in gcc 8+ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) +# We'll want to enable this eventually, but it's not going away for 5.7 at least +KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) + # Enabled with W=2, disabled by default as noisy KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)