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Thu, 19 Mar 2026 12:05:04 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Juergen Christ Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v2 6/9] s390/percpu: Use new percpu code section for arch_this_cpu_[and|or]() Date: Thu, 19 Mar 2026 13:05:00 +0100 Message-ID: <20260319120503.4046659-7-hca@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260319120503.4046659-1-hca@linux.ibm.com> References: <20260319120503.4046659-1-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-ORIG-GUID: rPWNwWVa92mKgaYZ6ZmJ2NiD6sR3zUYL X-Authority-Analysis: v=2.4 cv=KajfcAYD c=1 sm=1 tr=0 ts=69bbe675 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=4dLYTkTKlH5g-JvQF6AA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE5MDA5NCBTYWx0ZWRfXwtODNm8rHCbw bUbOjwPtx6KeCXLaLzGDPyoj+1a6gBZ7ZVBSI80LbUfWMirzUHwlIk26VnVGv4rsWLCqpEKSCU9 pRW8ug7Mh11eWzaJwZkWPNZ8NRfbpVsiAm02gRXzPxgHWxilLk5MXAPPqJWoYhyfdeBeVRVpiIh rFqzxqL3dOb/c1p6Yzg5wod1zkRsGob4mNCfhJdVxbGrJ5aJ47h0wePO6FqTLpijIAgk527lGPk IiQSVsL2CU5JhAkDMX2BPw3YT165vDUY9hlDpV7ebxRXcCSh1yrXFu9Wm7MS+b+/qsBQtGLgHhV wmnQna6HZllBpn5U1b0LNvw47KMZSgr7vQNa6XEMtLdWprGCnZL8bFzMDDCZ5BstD8Ws6Y5oXhn LtPy7KR/ikuFYRTvwOkKRR3CQfy07OildwBLRr2tjSHK0YABGX+bunwHOqUi3XWiNZXYuRHx/Ai MdCNCKndX8RNR0u2ReA== X-Proofpoint-GUID: rPWNwWVa92mKgaYZ6ZmJ2NiD6sR3zUYL 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=2026-03-19_01,2026-03-19_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 clxscore=1015 impostorscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603190094 Content-Type: text/plain; charset="utf-8" Convert arch_this_cpu_[and|or]() to make use of the new percpu code section infrastructure. There is no user of this_cpu_and() and only one user of this_cpu_or() within the kernel. Therefore this conversion has hardly any effect, and also removes only preempt_schedule_notrace() function call. 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 2479b4748510..510d9ce1ee47 100644 --- a/arch/s390/include/asm/percpu.h +++ b/arch/s390/include/asm/percpu.h @@ -208,17 +208,29 @@ =20 #define arch_this_cpu_to_op(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 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]", "%%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(); \ } =20 #define this_cpu_and_4(pcp, val) arch_this_cpu_to_op(pcp, val, "lan") --=20 2.51.0