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Mon, 27 Jul 2026 16:24:30 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 27 Jul 2026 16:24:30 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Harald Freudenberger , Holger Dengler , Vineeth Vijayan , Peter Oberparleiter , Janosch Frank , Claudio Imbrenda , David Hildenbrand , Peter Zijlstra Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] KVM: s390: Remove cond_resched() calls Date: Mon, 27 Jul 2026 18:24:28 +0200 Message-ID: <20260727162430.1599396-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260727162430.1599396-1-hca@linux.ibm.com> References: <20260727162430.1599396-1-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-ORIG-GUID: h1MKthZq0jCa2bCcUXBBUaIpPh066N_D X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI3MDE1MSBTYWx0ZWRfX0fTFf5PtF0/m 0cizx/BqIf+OmFkO7YuTnDDpS/4Gg7FBQG0inWrcVtjRClosllgNUCSf2FBs3wbbGu0dbzAesj5 0TWMrfON4TpDpGAwY/oSJJPM2eNCJXA= X-Authority-Analysis: v=2.4 cv=E/z9Y6dl c=1 sm=1 tr=0 ts=6a678b9f cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=cu7Gx01AU9FYDFtBg_UA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI3MDE1MSBTYWx0ZWRfX9jAoyjooThkC yaMbiV7DInYuBpIZDkwhtZE5i8O1QHMTPJXNYtRz898SUIfpyCWvW0yUrg6azZoYFESNtWyRU2K WI+1vMyU2riDG+5u7LhMG5F+kK5uwcpBmDH36RcaGIecLwmXue1uKL3pKBFqGZNKkZoW/w1qas/ feXl5tPmBGwhe7Jffn4aVV9kaU+S3AsLWSneauyeMDs0h2gE2ea2MOIiiDd2P9lvm6pHztg/VnZ wWtml2aIjUmJPW+7dLYbZqJ/MQDRl9MowqYrHbJKYynDXDcj9rpZ7yOzkZYDwbFohxySwEX/EU5 XRzCcOBHvtXgJywqWvDJbCpj3L0xGWUj/hVImZ13/0nHn9VmuU01BidigBohQdF/MATOD+3hNeF mnOxGg2bTXWu/SbX9gn0Iva6WHvtPFT69M3sCDf20GuQ+T7hd/yYXWYcLZ2SXJ34nS9fZ6+peo0 NCio0zchu/bV8p/w9wQ== X-Proofpoint-GUID: h1MKthZq0jCa2bCcUXBBUaIpPh066N_D X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-27_04,2026-07-24_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 spamscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607270151 Since [1] cond_resched() is a no-op on s390. Remove all calls. [1] commit 7dadeaa6e851 ("sched: Further restrict the preemption modes") Signed-off-by: Heiko Carstens --- arch/s390/include/asm/uv.h | 1 - arch/s390/kvm/gaccess.c | 8 ++------ arch/s390/kvm/gmap.c | 4 ---- arch/s390/kvm/kvm-s390.c | 1 - arch/s390/kvm/pv.c | 1 - arch/s390/kvm/vsie.c | 1 - arch/s390/mm/gmap_helpers.c | 1 - 7 files changed, 2 insertions(+), 15 deletions(-) diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index d919e69662f5..795da130342a 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -461,7 +461,6 @@ static inline int uv_call_sched(unsigned long r1, unsigned long r2) do { cc = __uv_call(r1, r2); - cond_resched(); } while (cc > 1); return cc; } diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index 36102b2727fb..0d389a302a70 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -151,10 +151,8 @@ static void ipte_lock_simple(struct kvm *kvm) ic = &kvm->arch.sca->ipte_control; old = READ_ONCE(*ic); do { - if (old.k) { - cond_resched(); + if (old.k) goto retry; - } new = old; new.k = 1; } while (!try_cmpxchg(&ic->val, &old.val, new.val)); @@ -189,10 +187,8 @@ static void ipte_lock_siif(struct kvm *kvm) ic = &kvm->arch.sca->ipte_control; old = READ_ONCE(*ic); do { - if (old.kg) { - cond_resched(); + if (old.kg) goto retry; - } new = old; new.k = 1; new.kh++; diff --git a/arch/s390/kvm/gmap.c b/arch/s390/kvm/gmap.c index 8abb4f55b306..3758e4009709 100644 --- a/arch/s390/kvm/gmap.c +++ b/arch/s390/kvm/gmap.c @@ -941,7 +941,6 @@ void gmap_split_huge_pages(struct gmap *gmap) scoped_guard(read_lock, &gmap->kvm->mmu_lock) start = _dat_walk_gfn_range(start, asce_end(gmap->asce), gmap->asce, &ops, DAT_WALK_IGN_HOLES, gmap); - cond_resched(); } while (start); } @@ -963,7 +962,6 @@ static int _gmap_enable_skeys(struct gmap *gmap) do { scoped_guard(write_lock, &gmap->kvm->mmu_lock) start = dat_reset_skeys(gmap->asce, start); - cond_resched(); } while (start); return 0; } @@ -1019,7 +1017,6 @@ int gmap_pv_destroy_range(struct gmap *gmap, gfn_t start, gfn_t end, bool interr DAT_WALK_IGN_HOLES, NULL); if (interruptible && fatal_signal_pending(current)) return -EINTR; - cond_resched(); } while (start && start < end); return 0; } @@ -1138,7 +1135,6 @@ void _gmap_set_cmma_all(struct gmap *gmap, bool dirty) gfn = _dat_walk_gfn_range(gfn, asce_end(gmap->asce), gmap->asce, &ops, DAT_WALK_IGN_HOLES, &gmap->kvm->arch.cmma_dirty_pages); - cond_resched(); } while (gfn); } diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 150b5dd2170e..2ede8f035a38 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1027,7 +1027,6 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att do { scoped_guard(read_lock, &kvm->mmu_lock) start_gfn = dat_reset_cmma(kvm->arch.gmap->asce, start_gfn); - cond_resched(); } while (start_gfn); ret = 0; break; diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c index 1beacc841ca8..935fe308a050 100644 --- a/arch/s390/kvm/pv.c +++ b/arch/s390/kvm/pv.c @@ -832,7 +832,6 @@ int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size, while (offset < size) { ret = unpack_one(kvm, addr, tweak, offset, rc, rrc); if (ret == -EAGAIN) { - cond_resched(); if (fatal_signal_pending(current)) break; continue; diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index eea24562e7db..6dcd3b110c17 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -1434,7 +1434,6 @@ static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) } if (sg) sg = gmap_put(sg); - cond_resched(); } if (sg) sg = gmap_put(sg); diff --git a/arch/s390/mm/gmap_helpers.c b/arch/s390/mm/gmap_helpers.c index 4bf7c9012feb..d564cdefb90f 100644 --- a/arch/s390/mm/gmap_helpers.c +++ b/arch/s390/mm/gmap_helpers.c @@ -272,7 +272,6 @@ static int __gmap_helper_unshare_zeropages(struct mm_struct *mm) * truncation. In that case, the shared zeropage would be gone * and we can simply retry and make progress. */ - cond_resched(); goto retry; } -- 2.53.0