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Tue, 28 Jul 2026 15:04:13 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 28 Jul 2026 15:04:13 +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 , Herbert Xu Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org Subject: [PATCH v2 2/4] KVM: s390: Remove cond_resched() calls Date: Tue, 28 Jul 2026 17:04:10 +0200 Message-ID: <20260728150412.3893933-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260728150412.3893933-1-hca@linux.ibm.com> References: <20260728150412.3893933-1-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: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI4MDEzMiBTYWx0ZWRfXz57IeYNjOfc0 G3Lc2AIs50T3pVs+6BzG726rSd0YXzgaN01WRYNKo/N2mqebCVuoShNUFw9N1rAuqYQyFnUXdzF Ydppw9ms3GqlinrIyd97HSI5BMWniSA= X-Proofpoint-GUID: RSm6YV_cuVZ8s_YbuRvE0SZS8gK7wXWb X-Proofpoint-ORIG-GUID: RSm6YV_cuVZ8s_YbuRvE0SZS8gK7wXWb X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI4MDEzMiBTYWx0ZWRfX6rejKyxgWRlc Osbn/+yTkBI6offvmU/tRngB6n3SJpEuqKDSRWvlvW3Idu7PCsKPUhLsah08JxIMW1EtC5XMj8I nAPLw862CUs8JYkvbK8wHPff/vXKQkXbk3OjPpt8J2fEmTeTUgnfgNGQaS9QBCXrmeBUX5ZkgL3 Z23gxOwT+XqhKwrLv7pk9TLv6vzsaArRYc8Wyusxgyj3hn9BJ8kDNOvGTIE91nxoaATJHbNJJbg D9Zby4P2dCJ6Pw5wF1z0dnHG1ccJHxCGWe80hrj9tqGFwTwKY5KB1ryv02tCZ7LFoNsLkzt7CH9 PhW8Lz40Re6LpitkjN0oUq37LgPD0W/TQnWfeW49TxlS+At7rHh9eqwyb1PNJqWO6ero8pkWfvQ 4W2jUgDVKdEKaNVkeQqhm1aGNMFmHOGojscA3/liweYKrP1QvYLXE7+9YhFqR+2TyRJd+nza5sX 5wrTVc4Nh9iD6eDsT9Q== X-Authority-Analysis: v=2.4 cv=X5Vi7mTe c=1 sm=1 tr=0 ts=6a68c4f2 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=cu7Gx01AU9FYDFtBg_UA:9 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=2026-07-28_04,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 malwarescore=0 spamscore=0 suspectscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607280132 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