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Mon, 21 Sep 2026 09:15:49 +0000 (GMT) Received: from osiris (unknown [9.111.14.239]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 21 Sep 2026 09:15:49 +0000 (GMT) Date: Mon, 21 Sep 2026 11:15:48 +0200 From: Heiko Carstens To: Heiko Carstens Cc: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Mete Durlu , Peter Zijlstra , Mark Rutland , Juergen Christ , Ilya Leoshkevich , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH v3 00/11] s390: More this_cpu_*() changes Message-ID: <20260921091548.9433A66-hca@linux.ibm.com> References: <20260921084005.4022574-1-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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260921084005.4022574-1-hca@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: oE9JNTFy4KkUP2s8deJHy02weHyHNfAX X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIxMDEzMCBTYWx0ZWRfX9+0EPcwmjZGm dsZZtZgdeB+YneBrM5cGYeuOS8e3lmvsAwBn97nPj/utRcVP1quP8vW4SvZeEw0AYttEgRbWyu3 eovzxn3UkvgmzPZaWh3HHBzc8kFBWnk= X-Authority-Analysis: v=2.4 cv=FLiOVOos c=1 sm=1 tr=0 ts=6ab0f5ca cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=fNzBTV0gexBZmlcSxmMA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: oE9JNTFy4KkUP2s8deJHy02weHyHNfAX X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIxMDEzMCBTYWx0ZWRfX/Dew/jzx4rBb PirUjgYyl3WE2dL5o7qfLLVdK8f4KA1lkyrKbrz1e+O3WBb6Oep2gAM7S9Unf/5g7fqoxeTf44K kfddsxpefpxEpJT/KlJ6oh2KSQ/rEYyRKqfddKOO2FBEX1wtQpdFQtYZBjJAU39uSUlpE3znzzF WbJbr9wlfKgUkbFbcBEMKR1DV+o9dn7f2a9fZCQmn7ephjZfFnRIu2ngHmExe6dn6Hwc8JpUilA CtwwFFo6oEF+GKvNfujxZnv/Leldm+jM+w+m2WA4y4Rf3mM5eh5c2/Wu9GXkQSz40j6e7gUf21g KrVFcs9RV1wnE4ZMJWxvkwO5yzvjeRUvhygXFAAOBIolJ388XN6YNH2GCiwW1sZfVH87zz0uc4P AUpkx/GiLvg1uQ1RSnjiGmKMiF/lURCGWk0n65X6AGNdjZKFNioOJo63URMulDfutWClo08bIbo GPVFVHEYXk5Z6CcpATA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-21_03,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 clxscore=1015 suspectscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609210130 On Mon, Sep 21, 2026 at 10:39:54AM +0200, Heiko Carstens wrote: > v3: > - Add various sanity checks to enforce correct register usage > [Mark Rutland] ... > s390/percpu: Rework to simplify percpu_entry() and percpu_exit() > > arch/s390/include/asm/entry-percpu.h | 71 ++---- > arch/s390/include/asm/lowcore.h | 5 +- > arch/s390/include/asm/percpu.h | 354 +++++++++++++++++---------- > arch/s390/kernel/irq.c | 10 +- > arch/s390/kernel/nmi.c | 4 +- > arch/s390/kernel/traps.c | 4 +- > 6 files changed, 248 insertions(+), 200 deletions(-) Please ignore this version. The checks are still not sufficient, and there is indeed a bug with register allocation in the last patch which Sashiko reported. The incorrect register allocation happened exactly once in my test build, which explains why everything worked for me (tm). I will need to send yet another version - sorry for the noise.