From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- arch/powerpc/kernel/interrupt.c | 507 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 507 insertions(+) create mode 100644 arch/powerpc/kernel/interrupt.c (limited to 'arch/powerpc/kernel/interrupt.c') diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c new file mode 100644 index 000000000..0ec158161 --- /dev/null +++ b/arch/powerpc/kernel/interrupt.c @@ -0,0 +1,507 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include /* for show_regs */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined(CONFIG_PPC_ADV_DEBUG_REGS) && defined(CONFIG_PPC32) +unsigned long global_dbcr0[NR_CPUS]; +#endif + +#ifdef CONFIG_PPC_BOOK3S_64 +DEFINE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant); +static inline bool exit_must_hard_disable(void) +{ + return static_branch_unlikely(&interrupt_exit_not_reentrant); +} +#else +static inline bool exit_must_hard_disable(void) +{ + return true; +} +#endif + +/* + * local irqs must be disabled. Returns false if the caller must re-enable + * them, check for new work, and try again. + * + * This should be called with local irqs disabled, but if they were previously + * enabled when the interrupt handler returns (indicating a process-context / + * synchronous interrupt) then irqs_enabled should be true. + * + * restartable is true then EE/RI can be left on because interrupts are handled + * with a restart sequence. + */ +static notrace __always_inline bool prep_irq_for_enabled_exit(bool restartable) +{ + bool must_hard_disable = (exit_must_hard_disable() || !restartable); + + /* This must be done with RI=1 because tracing may touch vmaps */ + trace_hardirqs_on(); + + if (must_hard_disable) + __hard_EE_RI_disable(); + +#ifdef CONFIG_PPC64 + /* This pattern matches prep_irq_for_idle */ + if (unlikely(lazy_irq_pending_nocheck())) { + if (must_hard_disable) { + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + __hard_RI_enable(); + } + trace_hardirqs_off(); + + return false; + } +#endif + return true; +} + +static notrace void booke_load_dbcr0(void) +{ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dbcr0 = current->thread.debug.dbcr0; + + if (likely(!(dbcr0 & DBCR0_IDM))) + return; + + /* + * Check to see if the dbcr0 register is set up to debug. + * Use the internal debug mode bit to do this. + */ + mtmsr(mfmsr() & ~MSR_DE); + if (IS_ENABLED(CONFIG_PPC32)) { + isync(); + global_dbcr0[smp_processor_id()] = mfspr(SPRN_DBCR0); + } + mtspr(SPRN_DBCR0, dbcr0); + mtspr(SPRN_DBSR, -1); +#endif +} + +static void check_return_regs_valid(struct pt_regs *regs) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + unsigned long trap, srr0, srr1; + static bool warned; + u8 *validp; + char *h; + + if (trap_is_scv(regs)) + return; + + trap = TRAP(regs); + // EE in HV mode sets HSRRs like 0xea0 + if (cpu_has_feature(CPU_FTR_HVMODE) && trap == INTERRUPT_EXTERNAL) + trap = 0xea0; + + switch (trap) { + case 0x980: + case INTERRUPT_H_DATA_STORAGE: + case 0xe20: + case 0xe40: + case INTERRUPT_HMI: + case 0xe80: + case 0xea0: + case INTERRUPT_H_FAC_UNAVAIL: + case 0x1200: + case 0x1500: + case 0x1600: + case 0x1800: + validp = &local_paca->hsrr_valid; + if (!*validp) + return; + + srr0 = mfspr(SPRN_HSRR0); + srr1 = mfspr(SPRN_HSRR1); + h = "H"; + + break; + default: + validp = &local_paca->srr_valid; + if (!*validp) + return; + + srr0 = mfspr(SPRN_SRR0); + srr1 = mfspr(SPRN_SRR1); + h = ""; + break; + } + + if (srr0 == regs->nip && srr1 == regs->msr) + return; + + /* + * A NMI / soft-NMI interrupt may have come in after we found + * srr_valid and before the SRRs are loaded. The interrupt then + * comes in and clobbers SRRs and clears srr_valid. Then we load + * the SRRs here and test them above and find they don't match. + * + * Test validity again after that, to catch such false positives. + * + * This test in general will have some window for false negatives + * and may not catch and fix all such cases if an NMI comes in + * later and clobbers SRRs without clearing srr_valid, but hopefully + * such things will get caught most of the time, statistically + * enough to be able to get a warning out. + */ + barrier(); + + if (!*validp) + return; + + if (!warned) { + warned = true; + printk("%sSRR0 was: %lx should be: %lx\n", h, srr0, regs->nip); + printk("%sSRR1 was: %lx should be: %lx\n", h, srr1, regs->msr); + show_regs(regs); + } + + *validp = 0; /* fixup */ +#endif +} + +static notrace unsigned long +interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs) +{ + unsigned long ti_flags; + +again: + ti_flags = read_thread_flags(); + while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) { + local_irq_enable(); + if (ti_flags & _TIF_NEED_RESCHED) { + schedule(); + } else { + /* + * SIGPENDING must restore signal handler function + * argument GPRs, and some non-volatiles (e.g., r1). + * Restore all for now. This could be made lighter. + */ + if (ti_flags & _TIF_SIGPENDING) + ret |= _TIF_RESTOREALL; + do_notify_resume(regs, ti_flags); + } + local_irq_disable(); + ti_flags = read_thread_flags(); + } + + if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) { + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && + unlikely((ti_flags & _TIF_RESTORE_TM))) { + restore_tm_state(regs); + } else { + unsigned long mathflags = MSR_FP; + + if (cpu_has_feature(CPU_FTR_VSX)) + mathflags |= MSR_VEC | MSR_VSX; + else if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mathflags |= MSR_VEC; + + /* + * If userspace MSR has all available FP bits set, + * then they are live and no need to restore. If not, + * it means the regs were given up and restore_math + * may decide to restore them (to avoid taking an FP + * fault). + */ + if ((regs->msr & mathflags) != mathflags) + restore_math(regs); + } + } + + check_return_regs_valid(regs); + + user_enter_irqoff(); + if (!prep_irq_for_enabled_exit(true)) { + user_exit_irqoff(); + local_irq_enable(); + local_irq_disable(); + goto again; + } + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + local_paca->tm_scratch = regs->msr; +#endif + + booke_load_dbcr0(); + + account_cpu_user_exit(); + + /* Restore user access locks last */ + kuap_user_restore(regs); + + return ret; +} + +/* + * This should be called after a syscall returns, with r3 the return value + * from the syscall. If this function returns non-zero, the system call + * exit assembly should additionally load all GPR registers and CTR and XER + * from the interrupt frame. + * + * The function graph tracer can not trace the return side of this function, + * because RI=0 and soft mask state is "unreconciled", so it is marked notrace. + */ +notrace unsigned long syscall_exit_prepare(unsigned long r3, + struct pt_regs *regs, + long scv) +{ + unsigned long ti_flags; + unsigned long ret = 0; + bool is_not_scv = !IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !scv; + + CT_WARN_ON(ct_state() == CONTEXT_USER); + + kuap_assert_locked(); + + regs->result = r3; + + /* Check whether the syscall is issued inside a restartable sequence */ + rseq_syscall(regs); + + ti_flags = read_thread_flags(); + + if (unlikely(r3 >= (unsigned long)-MAX_ERRNO) && is_not_scv) { + if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) { + r3 = -r3; + regs->ccr |= 0x10000000; /* Set SO bit in CR */ + } + } + + if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) { + if (ti_flags & _TIF_RESTOREALL) + ret = _TIF_RESTOREALL; + else + regs->gpr[3] = r3; + clear_bits(_TIF_PERSYSCALL_MASK, ¤t_thread_info()->flags); + } else { + regs->gpr[3] = r3; + } + + if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { + do_syscall_trace_leave(regs); + ret |= _TIF_RESTOREALL; + } + + local_irq_disable(); + ret = interrupt_exit_user_prepare_main(ret, regs); + +#ifdef CONFIG_PPC64 + regs->exit_result = ret; +#endif + + return ret; +} + +#ifdef CONFIG_PPC64 +notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs) +{ + /* + * This is called when detecting a soft-pending interrupt as well as + * an alternate-return interrupt. So we can't just have the alternate + * return path clear SRR1[MSR] and set PACA_IRQ_HARD_DIS (unless + * the soft-pending case were to fix things up as well). RI might be + * disabled, in which case it gets re-enabled by __hard_irq_disable(). + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + trace_hardirqs_off(); + user_exit_irqoff(); + account_cpu_user_entry(); + + BUG_ON(!user_mode(regs)); + + regs->exit_result = interrupt_exit_user_prepare_main(regs->exit_result, regs); + + return regs->exit_result; +} +#endif + +notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs) +{ + unsigned long ret; + + BUG_ON(regs_is_unrecoverable(regs)); + BUG_ON(arch_irq_disabled_regs(regs)); + CT_WARN_ON(ct_state() == CONTEXT_USER); + + /* + * We don't need to restore AMR on the way back to userspace for KUAP. + * AMR can only have been unlocked if we interrupted the kernel. + */ + kuap_assert_locked(); + + local_irq_disable(); + + ret = interrupt_exit_user_prepare_main(0, regs); + +#ifdef CONFIG_PPC64 + regs->exit_result = ret; +#endif + + return ret; +} + +void preempt_schedule_irq(void); + +notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs) +{ + unsigned long flags; + unsigned long ret = 0; + unsigned long kuap; + bool stack_store = read_thread_flags() & _TIF_EMULATE_STACK_STORE; + + if (regs_is_unrecoverable(regs)) + unrecoverable_exception(regs); + /* + * CT_WARN_ON comes here via program_check_exception, so avoid + * recursion. + * + * Skip the assertion on PMIs on 64e to work around a problem caused + * by NMI PMIs incorrectly taking this interrupt return path, it's + * possible for this to hit after interrupt exit to user switches + * context to user. See also the comment in the performance monitor + * handler in exceptions-64e.S + */ + if (!IS_ENABLED(CONFIG_PPC_BOOK3E_64) && + TRAP(regs) != INTERRUPT_PROGRAM && + TRAP(regs) != INTERRUPT_PERFMON) + CT_WARN_ON(ct_state() == CONTEXT_USER); + + kuap = kuap_get_and_assert_locked(); + + local_irq_save(flags); + + if (!arch_irq_disabled_regs(regs)) { + /* Returning to a kernel context with local irqs enabled. */ + WARN_ON_ONCE(!(regs->msr & MSR_EE)); +again: + if (IS_ENABLED(CONFIG_PREEMPT)) { + /* Return to preemptible kernel context */ + if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) { + if (preempt_count() == 0) + preempt_schedule_irq(); + } + } + + check_return_regs_valid(regs); + + /* + * Stack store exit can't be restarted because the interrupt + * stack frame might have been clobbered. + */ + if (!prep_irq_for_enabled_exit(unlikely(stack_store))) { + /* + * Replay pending soft-masked interrupts now. Don't + * just local_irq_enabe(); local_irq_disable(); because + * if we are returning from an asynchronous interrupt + * here, another one might hit after irqs are enabled, + * and it would exit via this same path allowing + * another to fire, and so on unbounded. + */ + hard_irq_disable(); + replay_soft_interrupts(); + /* Took an interrupt, may have more exit work to do. */ + goto again; + } +#ifdef CONFIG_PPC64 + /* + * An interrupt may clear MSR[EE] and set this concurrently, + * but it will be marked pending and the exit will be retried. + * This leaves a racy window where MSR[EE]=0 and HARD_DIS is + * clear, until interrupt_exit_kernel_restart() calls + * hard_irq_disable(), which will set HARD_DIS again. + */ + local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; + + } else { + check_return_regs_valid(regs); + + if (unlikely(stack_store)) + __hard_EE_RI_disable(); +#endif /* CONFIG_PPC64 */ + } + + if (unlikely(stack_store)) { + clear_bits(_TIF_EMULATE_STACK_STORE, ¤t_thread_info()->flags); + ret = 1; + } + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + local_paca->tm_scratch = regs->msr; +#endif + + /* + * 64s does not want to mfspr(SPRN_AMR) here, because this comes after + * mtmsr, which would cause Read-After-Write stalls. Hence, take the + * AMR value from the check above. + */ + kuap_kernel_restore(regs, kuap); + + return ret; +} + +#ifdef CONFIG_PPC64 +notrace unsigned long interrupt_exit_user_restart(struct pt_regs *regs) +{ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + trace_hardirqs_off(); + user_exit_irqoff(); + account_cpu_user_entry(); + + BUG_ON(!user_mode(regs)); + + regs->exit_result |= interrupt_exit_user_prepare(regs); + + return regs->exit_result; +} + +/* + * No real need to return a value here because the stack store case does not + * get restarted. + */ +notrace unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs) +{ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + +#ifdef CONFIG_PPC_BOOK3S_64 + set_kuap(AMR_KUAP_BLOCKED); +#endif + + if (regs->softe == IRQS_ENABLED) + trace_hardirqs_off(); + + BUG_ON(user_mode(regs)); + + return interrupt_exit_kernel_prepare(regs); +} +#endif -- cgit v1.2.3