From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 42B1C33F7;
	Thu, 25 Aug 2022 16:10:10 +0000 (UTC)
Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC67DC433C1;
	Thu, 25 Aug 2022 16:10:08 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;
	s=k20201202; t=1661443809;
	bh=YeZpqXiWIj2UfGQAr0U2HYO2aQK9k8WY7/sp89p4GTs=;
	h=Date:From:To:Cc:Subject:References:In-Reply-To:From;
	b=aaMwx8JKmkkb6t5r8pvyF2YpWKpX4SjF9KqZKXHKxAL2bkLj59sosnMbT7KLDUXeC
	 MuZWH6jEnAENICgMXZmj9CyIeWZ+czj2hzTq+ho/6licNb3A79kj1ztNs829U+02RU
	 8EP7yZJje2Ytht8AmmDi0pymRSWyH8oBa0sKGWHEODAaouA1/NuEvpUbZL2Lqg0iDx
	 cgW2AjPInr+1TzJpqxo+ByAWUS0UB7hrTOBH8Eyt3bTQib9A/pAbTq+UycoR7NWyIR
	 FD4f9HKnND++p5ItBYfnfD+z28AEdJcFaONZgYX4lKwG+PkJgLKel3wDhWV0ERgRBK
	 DfrtefSXYKcuQ==
Date: Thu, 25 Aug 2022 09:10:07 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>, linux-mm <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	open list <linux-kernel@vger.kernel.org>,
	regressions@lists.linux.dev,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Muchun Song <songmuchun@bytedance.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Axel Rasmussen <axelrasmussen@google.com>,
	David Hildenbrand <david@redhat.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	James Houghton <jthoughton@google.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Miaohe Lin <linmiaohe@huawei.com>, Michal Hocko <mhocko@suse.com>,
	Mina Almasry <almasrymina@google.com>,
	Naoya Horiguchi <naoya.horiguchi@linux.dev>,
	Pasha Tatashin <pasha.tatashin@soleen.com>,
	Peter Xu <peterx@redhat.com>,
	Prakash Sangappa <prakash.sangappa@oracle.com>,
	llvm@lists.linux.dev
Subject: Re: [next] x86: fs/hugetlbfs/inode.c:673:16: error: variable
 'm_index' is uninitialized when used here [-Werror,-Wuninitialized]
Message-ID: <Ywee393cssPJ07Gr@dev-arch.thelio-3990X>
References: <CA+G9fYsHVdu0toduQqk6vsR8Z8mOVzZ9-_p3O5fjQ5mOpSxsDA@mail.gmail.com>
Precedence: bulk
X-Mailing-List: llvm@lists.linux.dev
List-Id: <llvm.lists.linux.dev>
List-Subscribe: <mailto:llvm+subscribe@lists.linux.dev>
List-Unsubscribe: <mailto:llvm+unsubscribe@lists.linux.dev>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CA+G9fYsHVdu0toduQqk6vsR8Z8mOVzZ9-_p3O5fjQ5mOpSxsDA@mail.gmail.com>

Hi Naresh,

On Thu, Aug 25, 2022 at 04:13:30PM +0530, Naresh Kamboju wrote:
> The x86_64 and i386 clang builds failed due to these warnings / errors
> on Linux next-20220825.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> fs/hugetlbfs/inode.c:673:16: error: variable 'm_index' is
> uninitialized when used here [-Werror,-Wuninitialized]
>                                                 m_start, m_index, truncate_op);
>                                                          ^~~~~~~
> fs/hugetlbfs/inode.c:651:26: note: initialize the variable 'm_index'
> to silence this warning
>         pgoff_t m_start, m_index;
>                                 ^
>                                  = 0
> 1 error generated.

Thank you for the report! Commit fcc0d3d00d74 ("hugetlb: handle truncate
racing with page faults") introduced this warning; the Intel folks
caught this as well:

https://lore.kernel.org/202208251012.g1mOhhxy-lkp@intel.com/

As an aside, can you please update your contact for our mailing list to
llvm@lists.linux.dev? We do not use the Google Groups list anymore.

Cheers,
Nathan