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Tue, 26 May 2026 05:57:03 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 26 May 2026 05:57:03 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Juergen Christ Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v5 4/7] s390/percpu: Use new percpu code section for arch_this_cpu_add_return() Date: Tue, 26 May 2026 07:56:59 +0200 Message-ID: <20260526055702.1429061-5-hca@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260526055702.1429061-1-hca@linux.ibm.com> References: <20260526055702.1429061-1-hca@linux.ibm.com> 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-Spam-Details-Enc: AW1haW4tMjYwNTI2MDA0NiBTYWx0ZWRfX/DBIUf688vhe k07XpiRnHgn6WqtRfwLAOuM7xx3LdRJVzrT4ALIuaLFEF+/Z+cBq13ZW9nwJ7Dess2z+Y0OkQ/t yUT5mbD1c2UQlebp25UMQiejfCwfHB818pj865y0UTJHJquTU5borQxwZ0lgOeh8WM/7ikG9u5I zz3uXgrqZgbPNWy38KvSo6pCA725Z2kE3KSdHQJWtMhbv0s7HRiE05jOPMP0uo95DQBin2FOrIa RUoShJFzjAslBfUiVKaDzlfYGNeDGusq2bPbWWMPtLBdz/zPFQiEIyGdUZ2QfEmHaJCzFM1Szcu FL2z0d+EKifDNXxDWq2Z/B8HHfLqEzGlYQrElHaQLYDTeZaNB6EYAQ9sOpoYaez+k8Pv6uVh0TS HuWf0yI8ZZ8TmA7f3Emp134EFgBDFdKTT1Q41PLrKREechEeZk0s/mHX1Fo/jzk6x361wYoj6R6 Uxv+X4njQMHRS39haBQ== X-Authority-Analysis: v=2.4 cv=KItqylFo c=1 sm=1 tr=0 ts=6a153634 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=rpl92wOeoJCnW_j-IKQA:9 X-Proofpoint-ORIG-GUID: 12h1JfXv8IuLUVc8BuafzjQ81vpTPX23 X-Proofpoint-GUID: 12h1JfXv8IuLUVc8BuafzjQ81vpTPX23 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-26_01,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 priorityscore=1501 clxscore=1015 adultscore=0 suspectscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605260046 Convert arch_this_cpu_add_return() to make use of the new percpu code section infrastructure. With this the text size of the kernel image is reduced by ~4k (defconfig). Also 66 generated preempt_schedule_notrace() function calls within the kernel image (modules not counted) are removed. Signed-off-by: Heiko Carstens --- arch/s390/include/asm/percpu.h | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h index 9140d81b7efc..f2d0e0354582 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h @@ -185,17 +185,29 @@ do { \ #define arch_this_cpu_add_return(pcp, val, op) \ ({ \ + unsigned long lc_pcpr, lc_pcpo; \ typedef typeof(pcp) pcp_op_T__; \ pcp_op_T__ val__ = (val); \ pcp_op_T__ old__, *ptr__; \ - preempt_disable_notrace(); \ - ptr__ = raw_cpu_ptr(&(pcp)); \ - asm volatile( \ - op " %[old__],%[val__],%[ptr__]" \ - : [old__] "=d" (old__), [ptr__] "+Q" (*ptr__) \ - : [val__] "d" (val__) \ + \ + lc_pcpr = offsetof(struct lowcore, percpu_register); \ + lc_pcpo = offsetof(struct lowcore, percpu_offset); \ + ptr__ = PERCPU_PTR(&(pcp)); \ + asm_inline volatile( \ + MVIY_PERCPU("%[disppcpr]", "%[dispaltpcpr]", "%[ptr__]")\ + AG_ALT("%[disppcpo]", "%[dispaltpcpo]", "%[ptr__]") \ + op " %[old__],%[val__],0(%[ptr__])\n" \ + MVIY_ALT("%[disppcpr]", "%[dispaltpcpr]") \ + : [old__] "=&d" (old__), \ + [ptr__] "+&a" (ptr__), "+m" (*ptr__), \ + "=m" (((struct lowcore *)0)->percpu_register) \ + : [val__] "d" (val__), \ + [disppcpr] "i" (lc_pcpr), \ + [disppcpo] "i" (lc_pcpo), \ + [dispaltpcpr] "i" (lc_pcpr + LOWCORE_ALT_ADDRESS), \ + [dispaltpcpo] "i" (lc_pcpo + LOWCORE_ALT_ADDRESS), \ + "m" (((struct lowcore *)0)->percpu_offset) \ : "cc"); \ - preempt_enable_notrace(); \ old__ + val__; \ }) -- 2.51.0