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Tue, 17 Mar 2026 19:54:38 +0000 (GMT) From: Heiko Carstens To: Peter Zijlstra , Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Juergen Christ Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 5/9] s390/percpu: Use new percpu code section for arch_this_cpu_add_return() Date: Tue, 17 Mar 2026 20:54:32 +0100 Message-ID: <20260317195436.2276810-6-hca@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260317195436.2276810-1-hca@linux.ibm.com> References: <20260317195436.2276810-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE3MDE3NCBTYWx0ZWRfX+ugNiiQWQBk/ LwhFfhYfZ3cSqOgwIxC1cJev+cVt9gz2Om0T1Vl6LYoN3fd2H20h0t4KSxqUJm6R71vooWBSH4L 7iuAnqt0VtVoKXfI913cemql667FIPLVkdWeIQPozyYTrmX96OHFAmiD4js6eAoP+QA/FSiDh6a SbWhNfV2JVQBBXNmnC9oEhEfd56WsVkivaL1S4o+gSNxIMBq3XuyINvluAKTz4xYNxCSXecwawF kdxtfLRnUV4ZmLUXgWj7USSPIuF5QDz97vGuOqubaVEM9yHhpmWgInsGeCrQ7uBGb38+anMmjuT iZmvVD6pNZy3nk7P2wonJwnDE+lGt2js6V6f/S1y7uFfpfGiKlSQ+Z4eW0h0oKd3a6FtgykI+c5 xTwJkJaabdfZ1vMF8ZelGbprB4DQ80cyKWrF7R4kynvluJlwUeKamDubJITu72jz743V/dNffBr U+fWAFUYXMjUh9XwsVQ== X-Authority-Analysis: v=2.4 cv=GIQF0+NK c=1 sm=1 tr=0 ts=69b9b183 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=AksqfXeGXF_AYWYsu5gA:9 X-Proofpoint-ORIG-GUID: Yp1qgF_h7ra2zBREn3AzG82d0GI8wB-K X-Proofpoint-GUID: Yp1qgF_h7ra2zBREn3AzG82d0GI8wB-K 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=2026-03-17_04,2026-03-17_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 impostorscore=0 suspectscore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603170174 Content-Type: text/plain; charset="utf-8" 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 c92b41efbc47..6e932f45f128 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h @@ -177,17 +177,29 @@ =20 #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__ =3D (val); \ pcp_op_T__ old__, *ptr__; \ - preempt_disable_notrace(); \ - ptr__ =3D raw_cpu_ptr(&(pcp)); \ - asm volatile( \ - op " %[old__],%[val__],%[ptr__]" \ - : [old__] "=3Dd" (old__), [ptr__] "+Q" (*ptr__) \ - : [val__] "d" (val__) \ + \ + lc_pcpr =3D offsetof(struct lowcore, percpu_register); \ + lc_pcpo =3D offsetof(struct lowcore, percpu_offset); \ + ptr__ =3D &(pcp); \ + asm_inline volatile( \ + MVIY_PERCPU("%[disppcpr]", "%[dispaltpcpr]", "%[ptr__]")\ + AG_ALT("%[disppcpo]", "%[dispaltpcpo]", "%[ptr__]") \ + op " %[old__],%[val__],0(%[ptr__])\n" \ + MVIY_ALT("%[disppcpr]", "%[dispaltpcpr]", "%%r0") \ + : [old__] "=3D&d" (old__), \ + [ptr__] "+&a" (ptr__), "+m" (*ptr__), \ + "=3Dm" (((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__; \ }) =20 --=20 2.51.0