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Bottomley" , "Martin K. Petersen" , Larry Finger , Florian Schilhabel , Greg Kroah-Hartman , "David S . Miller" , Wensong Zhang , Simon Horman , Julian Anastasov , Pablo Neira Ayuso , James Morris , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, netdev@vger.kernel.org, lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, Ard Biesheuvel , Hannes Reinecke , Willy Tarreau , Silvio Cesare Subject: Re: [PATCH 2/4] lpfc: reduce stack size with CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE From: "Martin K. Petersen" Organization: Oracle Corporation References: <20190628123819.2785504-1-arnd@arndb.de> <20190628123819.2785504-2-arnd@arndb.de> Date: Thu, 11 Jul 2019 20:47:03 -0400 In-Reply-To: <20190628123819.2785504-2-arnd@arndb.de> (Arnd Bergmann's message of "Fri, 28 Jun 2019 14:37:47 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9315 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907120007 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9315 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default 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-1907120008 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Arnd, > The lpfc_debug_dump_all_queues() function repeatedly calls into > lpfc_debug_dump_qe(), which has a temporary 128 byte buffer. This was > fine before the introduction of CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE > because each instance could occupy the same stack slot. However, now > they each get their own copy, which leads to a huge increase in stack > usage as seen from the compiler warning: Applied to 5.3/scsi-fixes. Thank you! -- Martin K. Petersen Oracle Linux Engineering