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Mon, 03 Jun 2019 18:08:14 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5403BbY18022734 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 4 Jun 2019 00:03:11 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 471C2AC05F; Tue, 4 Jun 2019 00:03:11 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C4EACAC065; Tue, 4 Jun 2019 00:03:09 +0000 (GMT) Received: from oc6857751186.ibm.com (unknown [9.85.191.102]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 4 Jun 2019 00:03:09 +0000 (GMT) Subject: Re: [PATCH v2] PCI: rpaphp: Avoid a sometimes-uninitialized warning To: Nathan Chancellor , Tyrel Datwyler , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nick Desaulniers References: <20190603174323.48251-1-natechancellor@gmail.com> <20190603221157.58502-1-natechancellor@gmail.com> From: Tyrel Datwyler Message-ID: <78f5a331-6158-0ef5-0476-b976c8e71a68@linux.vnet.ibm.com> Date: Mon, 3 Jun 2019 17:03:09 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190603221157.58502-1-natechancellor@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-03_19:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906030160 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 06/03/2019 03:11 PM, Nathan Chancellor wrote: > When building with -Wsometimes-uninitialized, clang warns: > > drivers/pci/hotplug/rpaphp_core.c:243:14: warning: variable 'fndit' is > used uninitialized whenever 'for' loop exits because its condition is > false [-Wsometimes-uninitialized] > for (j = 0; j < entries; j++) { > ^~~~~~~~~~~ > drivers/pci/hotplug/rpaphp_core.c:256:6: note: uninitialized use occurs > here > if (fndit) > ^~~~~ > drivers/pci/hotplug/rpaphp_core.c:243:14: note: remove the condition if > it is always true > for (j = 0; j < entries; j++) { > ^~~~~~~~~~~ > drivers/pci/hotplug/rpaphp_core.c:233:14: note: initialize the variable > 'fndit' to silence this warning > int j, fndit; > ^ > = 0 > > fndit is only used to gate a sprintf call, which can be moved into the > loop to simplify the code and eliminate the local variable, which will > fix this warning. > > Link: https://github.com/ClangBuiltLinux/linux/issues/504 > Fixes: 2fcf3ae508c2 ("hotplug/drc-info: Add code to search ibm,drc-info property") > Suggested-by: Nick Desaulniers > Signed-off-by: Nathan Chancellor Acked-by: Tyrel Datwyler