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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 E504BC3B1A2 for ; Fri, 14 Feb 2020 16:36:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3E38217F4 for ; Fri, 14 Feb 2020 16:36:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581698206; bh=RQoQ8frxlbI1QjilHnH3/LmzPQ60HcJMzxc+C18UY60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mYf3R9FizQ09/eC5G9rZQyiAe9I/vhtM1Bg0AMS/B01SH01EAeYLfONPl0JpNp493 f/CK2WD4zg+3ITKeeTCKPCvGi/GMKVD12oYmUa40/LpHhBppPhq6mUECeGfVf4IT6G Q9HqIDw9N6qxQpule+GKH+YE6CnaxT6jlNeb09SQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405828AbgBNQYN (ORCPT ); Fri, 14 Feb 2020 11:24:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:60916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405599AbgBNQYM (ORCPT ); Fri, 14 Feb 2020 11:24:12 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 237E82476A; Fri, 14 Feb 2020 16:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697452; bh=RQoQ8frxlbI1QjilHnH3/LmzPQ60HcJMzxc+C18UY60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sIMm4P02YtTpDd08G3z4cXkkvmTvG10Msji6l/Fm7koiVTTB6qJi35mjMUbdPRGoc oPjFACIpR2cBdZx669ZAnaV454WsrL65gJla7uocv47dMQqepczPaWiD8hE4PjYY9i UA8saW8uKe9rv77Dby89O/73uuE3/ta6dQAtpPak= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Coly Li , kbuild test robot , Jens Axboe , Sasha Levin , linux-bcache@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 135/141] bcache: explicity type cast in bset_bkey_last() Date: Fri, 14 Feb 2020 11:21:15 -0500 Message-Id: <20200214162122.19794-135-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162122.19794-1-sashal@kernel.org> References: <20200214162122.19794-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Coly Li [ Upstream commit 7c02b0055f774ed9afb6e1c7724f33bf148ffdc0 ] In bset.h, macro bset_bkey_last() is defined as, bkey_idx((struct bkey *) (i)->d, (i)->keys) Parameter i can be variable type of data structure, the macro always works once the type of struct i has member 'd' and 'keys'. bset_bkey_last() is also used in macro csum_set() to calculate the checksum of a on-disk data structure. When csum_set() is used to calculate checksum of on-disk bcache super block, the parameter 'i' data type is struct cache_sb_disk. Inside struct cache_sb_disk (also in struct cache_sb) the member keys is __u16 type. But bkey_idx() expects unsigned int (a 32bit width), so there is problem when sending parameters via stack to call bkey_idx(). Sparse tool from Intel 0day kbuild system reports this incompatible problem. bkey_idx() is part of user space API, so the simplest fix is to cast the (i)->keys to unsigned int type in macro bset_bkey_last(). Reported-by: kbuild test robot Signed-off-by: Coly Li Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/md/bcache/bset.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index b935839ab79c6..f483041eed986 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -380,7 +380,8 @@ void bch_btree_keys_stats(struct btree_keys *, struct bset_stats *); /* Bkey utility code */ -#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys) +#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, \ + (unsigned int)(i)->keys) static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned idx) { -- 2.20.1