Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

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().
  ...

1 files changed, 394 insertions, 0 deletions

diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
new file mode 100644
index 000000000..179aabfa7
--- /dev/null
+++ b/arch/sparc/kernel/traps_32.c
@@ -0,0 +1,394 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sparc/kernel/traps.c
+ *
+ * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
+ */
+
+/*
+ * I hate traps on the sparc, grrr...
+ */
+
+#include <linux/sched/mm.h>
+#include <linux/sched/debug.h>
+#include <linux/mm_types.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/smp.h>
+#include <linux/kdebug.h>
+#include <linux/export.h>
+#include <linux/pgtable.h>
+
+#include <asm/delay.h>
+#include <asm/ptrace.h>
+#include <asm/oplib.h>
+#include <asm/page.h>
+#include <asm/unistd.h>
+#include <asm/traps.h>
+
+#include "entry.h"
+#include "kernel.h"
+
+/* #define TRAP_DEBUG */
+
+static void instruction_dump(unsigned long *pc)
+{
+	int i;
+	
+	if((((unsigned long) pc) & 3))
+                return;
+
+	for(i = -3; i < 6; i++)
+		printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
+	printk("\n");
+}
+
+#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
+#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
+
+void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
+{
+	static int die_counter;
+	int count = 0;
+
+	/* Amuse the user. */
+	printk(
+"              \\|/ ____ \\|/\n"
+"              \"@'/ ,. \\`@\"\n"
+"              /_| \\__/ |_\\\n"
+"                 \\__U_/\n");
+
+	printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
+	show_regs(regs);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+
+	__SAVE; __SAVE; __SAVE; __SAVE;
+	__SAVE; __SAVE; __SAVE; __SAVE;
+	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
+	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
+
+	{
+		struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
+
+		/* Stop the back trace when we hit userland or we
+		 * find some badly aligned kernel stack. Set an upper
+		 * bound in case our stack is trashed and we loop.
+		 */
+		while(rw					&&
+		      count++ < 30				&&
+                      (((unsigned long) rw) >= PAGE_OFFSET)	&&
+		      !(((unsigned long) rw) & 0x7)) {
+			printk("Caller[%08lx]: %pS\n", rw->ins[7],
+			       (void *) rw->ins[7]);
+			rw = (struct reg_window32 *)rw->ins[6];
+		}
+	}
+	printk("Instruction DUMP:");
+	instruction_dump ((unsigned long *) regs->pc);
+	make_task_dead((regs->psr & PSR_PS) ? SIGKILL : SIGSEGV);
+}
+
+void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
+{
+	if(type < 0x80) {
+		/* Sun OS's puke from bad traps, Linux survives! */
+		printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
+		die_if_kernel("Whee... Hello Mr. Penguin", regs);
+	}	
+
+	if(regs->psr & PSR_PS)
+		die_if_kernel("Kernel bad trap", regs);
+
+	force_sig_fault_trapno(SIGILL, ILL_ILLTRP,
+			       (void __user *)regs->pc, type - 0x80);
+}
+
+void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			    unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Kernel illegal instruction", regs);
+#ifdef TRAP_DEBUG
+	printk("Ill instr. at pc=%08lx instruction is %08lx\n",
+	       regs->pc, *(unsigned long *)regs->pc);
+#endif
+
+	send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, current);
+}
+
+void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
+	send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, current);
+}
+
+/* XXX User may want to be allowed to do this. XXX */
+
+void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			    unsigned long psr)
+{
+	if(regs->psr & PSR_PS) {
+		printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
+		       regs->u_regs[UREG_RETPC]);
+		die_if_kernel("BOGUS", regs);
+		/* die_if_kernel("Kernel MNA access", regs); */
+	}
+#if 0
+	show_regs (regs);
+	instruction_dump ((unsigned long *) regs->pc);
+	printk ("do_MNA!\n");
+#endif
+	send_sig_fault(SIGBUS, BUS_ADRALN,
+		       /* FIXME: Should dig out mna address */ (void *)0,
+		       current);
+}
+
+static unsigned long init_fsr = 0x0UL;
+static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
+                { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
+		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
+
+void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		 unsigned long psr)
+{
+	/* Sanity check... */
+	if(psr & PSR_PS)
+		die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
+
+	put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
+	regs->psr |= PSR_EF;
+#ifndef CONFIG_SMP
+	if(last_task_used_math == current)
+		return;
+	if(last_task_used_math) {
+		/* Other processes fpu state, save away */
+		struct task_struct *fptask = last_task_used_math;
+		fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
+		       &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
+	}
+	last_task_used_math = current;
+	if(used_math()) {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+	} else {
+		/* Set initial sane state. */
+		fpload(&init_fregs[0], &init_fsr);
+		set_used_math();
+	}
+#else
+	if(!used_math()) {
+		fpload(&init_fregs[0], &init_fsr);
+		set_used_math();
+	} else {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+	}
+	set_thread_flag(TIF_USEDFPU);
+#endif
+}
+
+static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
+static unsigned long fake_fsr;
+static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
+static unsigned long fake_depth;
+
+void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		 unsigned long psr)
+{
+	static int calls;
+	unsigned long fsr;
+	int ret = 0;
+	int code;
+#ifndef CONFIG_SMP
+	struct task_struct *fpt = last_task_used_math;
+#else
+	struct task_struct *fpt = current;
+#endif
+	put_psr(get_psr() | PSR_EF);
+	/* If nobody owns the fpu right now, just clear the
+	 * error into our fake static buffer and hope it don't
+	 * happen again.  Thank you crashme...
+	 */
+#ifndef CONFIG_SMP
+	if(!fpt) {
+#else
+	if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
+#endif
+		fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
+		regs->psr &= ~PSR_EF;
+		return;
+	}
+	fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
+	       &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
+#ifdef DEBUG_FPU
+	printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
+#endif
+
+	switch ((fpt->thread.fsr & 0x1c000)) {
+	/* switch on the contents of the ftt [floating point trap type] field */
+#ifdef DEBUG_FPU
+	case (1 << 14):
+		printk("IEEE_754_exception\n");
+		break;
+#endif
+	case (2 << 14):  /* unfinished_FPop (underflow & co) */
+	case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
+		ret = do_mathemu(regs, fpt);
+		break;
+#ifdef DEBUG_FPU
+	case (4 << 14):
+		printk("sequence_error (OS bug...)\n");
+		break;
+	case (5 << 14):
+		printk("hardware_error (uhoh!)\n");
+		break;
+	case (6 << 14):
+		printk("invalid_fp_register (user error)\n");
+		break;
+#endif /* DEBUG_FPU */
+	}
+	/* If we successfully emulated the FPop, we pretend the trap never happened :-> */
+	if (ret) {
+		fpload(&current->thread.float_regs[0], &current->thread.fsr);
+		return;
+	}
+	/* nope, better SIGFPE the offending process... */
+	       
+#ifdef CONFIG_SMP
+	clear_tsk_thread_flag(fpt, TIF_USEDFPU);
+#endif
+	if(psr & PSR_PS) {
+		/* The first fsr store/load we tried trapped,
+		 * the second one will not (we hope).
+		 */
+		printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
+		       regs->pc);
+		regs->pc = regs->npc;
+		regs->npc += 4;
+		calls++;
+		if(calls > 2)
+			die_if_kernel("Too many Penguin-FPU traps from kernel mode",
+				      regs);
+		return;
+	}
+
+	fsr = fpt->thread.fsr;
+	code = FPE_FLTUNK;
+	if ((fsr & 0x1c000) == (1 << 14)) {
+		if (fsr & 0x10)
+			code = FPE_FLTINV;
+		else if (fsr & 0x08)
+			code = FPE_FLTOVF;
+		else if (fsr & 0x04)
+			code = FPE_FLTUND;
+		else if (fsr & 0x02)
+			code = FPE_FLTDIV;
+		else if (fsr & 0x01)
+			code = FPE_FLTRES;
+	}
+	send_sig_fault(SIGFPE, code, (void __user *)pc, fpt);
+#ifndef CONFIG_SMP
+	last_task_used_math = NULL;
+#endif
+	regs->psr &= ~PSR_EF;
+	if(calls > 0)
+		calls=0;
+}
+
+void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+	if(psr & PSR_PS)
+		die_if_kernel("Penguin overflow trap from kernel mode", regs);
+	send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, current);
+}
+
+void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	if(psr & PSR_PS)
+		panic("Tell me what a watchpoint trap is, and I'll then deal "
+		      "with such a beast...");
+}
+
+void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc);
+}
+
+void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			unsigned long psr)
+{
+	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, current);
+}
+
+void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+			 unsigned long psr)
+{
+#ifdef TRAP_DEBUG
+	printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
+	       pc, npc, psr);
+#endif
+	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, current);
+}
+
+void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
+		       unsigned long psr)
+{
+	send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, current);
+}
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+void do_BUG(const char *file, int line)
+{
+        // bust_spinlocks(1);   XXX Not in our original BUG()
+        printk("kernel BUG at %s:%d!\n", file, line);
+}
+EXPORT_SYMBOL(do_BUG);
+#endif
+
+/* Since we have our mappings set up, on multiprocessors we can spin them
+ * up here so that timer interrupts work during initialization.
+ */
+
+void trap_init(void)
+{
+	extern void thread_info_offsets_are_bolixed_pete(void);
+
+	/* Force linker to barf if mismatched */
+	if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
+	    TI_TASK        != offsetof(struct thread_info, task) ||
+	    TI_FLAGS       != offsetof(struct thread_info, flags) ||
+	    TI_CPU         != offsetof(struct thread_info, cpu) ||
+	    TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
+	    TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
+	    TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
+	    TI_KSP         != offsetof(struct thread_info, ksp) ||
+	    TI_KPC         != offsetof(struct thread_info, kpc) ||
+	    TI_KPSR        != offsetof(struct thread_info, kpsr) ||
+	    TI_KWIM        != offsetof(struct thread_info, kwim) ||
+	    TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
+	    TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
+	    TI_W_SAVED     != offsetof(struct thread_info, w_saved))
+		thread_info_offsets_are_bolixed_pete();
+
+	/* Attach to the address space of init_task. */
+	mmgrab(&init_mm);
+	current->active_mm = &init_mm;
+
+	/* NOTE: Other cpus have this done as they are started
+	 *       up on SMP.
+	 */
+}