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Thu, 27 Mar 2025 15:38:25 +0000 (GMT) Received: from funtu2.fritz.box?044ibm.com (unknown [9.171.80.24]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 27 Mar 2025 15:38:24 +0000 (GMT) From: Harald Freudenberger To: seiden@linux.ibm.com Cc: linux-s390@vger.kernel.org Subject: [PATCH v1 0/1] Remove the need to alloc memory in uv.c Date: Thu, 27 Mar 2025 16:38:23 +0100 Message-ID: <20250327153824.61600-1-freude@linux.ibm.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: AznWXMBsMtYKpggd8DsSdlKKEMhAkvjP X-Proofpoint-ORIG-GUID: AznWXMBsMtYKpggd8DsSdlKKEMhAkvjP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-27_01,2025-03-26_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 clxscore=1015 phishscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=489 suspectscore=0 impostorscore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503270105 The pkey handler is calling the uv in some circumstances where no memory allocation is acceptable. As of now only the uv_get_secret_metadata() function allocates memory. As this is exactly one page, lets introduce a pre-allocated work page and protect the concurrent use with a mutex to remove dynamic memory allocation and free. This page may be also used with future extension to the uv code. Harald Freudenberger (1): s390/uv: Prealloc and use one work page arch/s390/kernel/uv.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) -- 2.43.0