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, 328 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
new file mode 100644
index 000000000..9e45f6735
--- /dev/null
+++ b/arch/alpha/include/asm/pgtable.h
@@ -0,0 +1,328 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ALPHA_PGTABLE_H
+#define _ALPHA_PGTABLE_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the Alpha page table tree.
+ *
+ * This hopefully works with any standard Alpha page-size, as defined
+ * in <asm/page.h> (currently 8192).
+ */
+#include <linux/mmzone.h>
+
+#include <asm/page.h>
+#include <asm/processor.h>	/* For TASK_SIZE */
+#include <asm/machvec.h>
+#include <asm/setup.h>
+
+struct mm_struct;
+struct vm_area_struct;
+
+/* Certain architectures need to do special things when PTEs
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+/* PMD_SHIFT determines the size of the area a second-level page table can map */
+#define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT-3))
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define PGDIR_SHIFT	(PAGE_SHIFT + 2*(PAGE_SHIFT-3))
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/*
+ * Entries per page directory level:  the Alpha is three-level, with
+ * all levels having a one-page page table.
+ */
+#define PTRS_PER_PTE	(1UL << (PAGE_SHIFT-3))
+#define PTRS_PER_PMD	(1UL << (PAGE_SHIFT-3))
+#define PTRS_PER_PGD	(1UL << (PAGE_SHIFT-3))
+#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
+
+/* Number of pointers that fit on a page:  this will go away. */
+#define PTRS_PER_PAGE	(1UL << (PAGE_SHIFT-3))
+
+#ifdef CONFIG_ALPHA_LARGE_VMALLOC
+#define VMALLOC_START		0xfffffe0000000000
+#else
+#define VMALLOC_START		(-2*PGDIR_SIZE)
+#endif
+#define VMALLOC_END		(-PGDIR_SIZE)
+
+/*
+ * OSF/1 PAL-code-imposed page table bits
+ */
+#define _PAGE_VALID	0x0001
+#define _PAGE_FOR	0x0002	/* used for page protection (fault on read) */
+#define _PAGE_FOW	0x0004	/* used for page protection (fault on write) */
+#define _PAGE_FOE	0x0008	/* used for page protection (fault on exec) */
+#define _PAGE_ASM	0x0010
+#define _PAGE_KRE	0x0100	/* xxx - see below on the "accessed" bit */
+#define _PAGE_URE	0x0200	/* xxx */
+#define _PAGE_KWE	0x1000	/* used to do the dirty bit in software */
+#define _PAGE_UWE	0x2000	/* used to do the dirty bit in software */
+
+/* .. and these are ours ... */
+#define _PAGE_DIRTY	0x20000
+#define _PAGE_ACCESSED	0x40000
+
+/*
+ * NOTE! The "accessed" bit isn't necessarily exact:  it can be kept exactly
+ * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it.
+ * Under Linux/AXP, the "accessed" bit just means "read", and I'll just use
+ * the KRE/URE bits to watch for it. That way we don't need to overload the
+ * KWE/UWE bits with both handling dirty and accessed.
+ *
+ * Note that the kernel uses the accessed bit just to check whether to page
+ * out a page or not, so it doesn't have to be exact anyway.
+ */
+
+#define __DIRTY_BITS	(_PAGE_DIRTY | _PAGE_KWE | _PAGE_UWE)
+#define __ACCESS_BITS	(_PAGE_ACCESSED | _PAGE_KRE | _PAGE_URE)
+
+#define _PFN_MASK	0xFFFFFFFF00000000UL
+
+#define _PAGE_TABLE	(_PAGE_VALID | __DIRTY_BITS | __ACCESS_BITS)
+#define _PAGE_CHG_MASK	(_PFN_MASK | __DIRTY_BITS | __ACCESS_BITS)
+
+/*
+ * All the normal masks have the "page accessed" bits on, as any time they are used,
+ * the page is accessed. They are cleared only by the page-out routines
+ */
+#define PAGE_NONE	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOR | _PAGE_FOW | _PAGE_FOE)
+#define PAGE_SHARED	__pgprot(_PAGE_VALID | __ACCESS_BITS)
+#define PAGE_COPY	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
+#define PAGE_READONLY	__pgprot(_PAGE_VALID | __ACCESS_BITS | _PAGE_FOW)
+#define PAGE_KERNEL	__pgprot(_PAGE_VALID | _PAGE_ASM | _PAGE_KRE | _PAGE_KWE)
+
+#define _PAGE_NORMAL(x) __pgprot(_PAGE_VALID | __ACCESS_BITS | (x))
+
+#define _PAGE_P(x) _PAGE_NORMAL((x) | (((x) & _PAGE_FOW)?0:_PAGE_FOW))
+#define _PAGE_S(x) _PAGE_NORMAL(x)
+
+/*
+ * The hardware can handle write-only mappings, but as the Alpha
+ * architecture does byte-wide writes with a read-modify-write
+ * sequence, it's not practical to have write-without-read privs.
+ * Thus the "-w- -> rw-" and "-wx -> rwx" mapping here (and in
+ * arch/alpha/mm/fault.c)
+ */
+	/* xwr */
+
+/*
+ * pgprot_noncached() is only for infiniband pci support, and a real
+ * implementation for RAM would be more complicated.
+ */
+#define pgprot_noncached(prot)	(prot)
+
+/*
+ * BAD_PAGETABLE is used when we need a bogus page-table, while
+ * BAD_PAGE is used for a bogus page.
+ *
+ * ZERO_PAGE is a global shared page that is always zero:  used
+ * for zero-mapped memory areas etc..
+ */
+extern pte_t __bad_page(void);
+extern pmd_t * __bad_pagetable(void);
+
+extern unsigned long __zero_page(void);
+
+#define BAD_PAGETABLE	__bad_pagetable()
+#define BAD_PAGE	__bad_page()
+#define ZERO_PAGE(vaddr)	(virt_to_page(ZERO_PGE))
+
+/* number of bits that fit into a memory pointer */
+#define BITS_PER_PTR			(8*sizeof(unsigned long))
+
+/* to align the pointer to a pointer address */
+#define PTR_MASK			(~(sizeof(void*)-1))
+
+/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
+#define SIZEOF_PTR_LOG2			3
+
+/* to find an entry in a page-table */
+#define PAGE_PTR(address)		\
+  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
+
+/*
+ * On certain platforms whose physical address space can overlap KSEG,
+ * namely EV6 and above, we must re-twiddle the physaddr to restore the
+ * correct high-order bits.
+ *
+ * This is extremely confusing until you realize that this is actually
+ * just working around a userspace bug.  The X server was intending to
+ * provide the physical address but instead provided the KSEG address.
+ * Or tried to, except it's not representable.
+ * 
+ * On Tsunami there's nothing meaningful at 0x40000000000, so this is
+ * a safe thing to do.  Come the first core logic that does put something
+ * in this area -- memory or whathaveyou -- then this hack will have
+ * to go away.  So be prepared!
+ */
+
+#if defined(CONFIG_ALPHA_GENERIC) && defined(USE_48_BIT_KSEG)
+#error "EV6-only feature in a generic kernel"
+#endif
+#if defined(CONFIG_ALPHA_GENERIC) || \
+    (defined(CONFIG_ALPHA_EV6) && !defined(USE_48_BIT_KSEG))
+#define KSEG_PFN	(0xc0000000000UL >> PAGE_SHIFT)
+#define PHYS_TWIDDLE(pfn) \
+  ((((pfn) & KSEG_PFN) == (0x40000000000UL >> PAGE_SHIFT)) \
+  ? ((pfn) ^= KSEG_PFN) : (pfn))
+#else
+#define PHYS_TWIDDLE(pfn) (pfn)
+#endif
+
+/*
+ * Conversion functions:  convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define page_to_pa(page)	(page_to_pfn(page) << PAGE_SHIFT)
+#define pte_pfn(pte)	(pte_val(pte) >> 32)
+
+#define pte_page(pte)	pfn_to_page(pte_pfn(pte))
+#define mk_pte(page, pgprot)						\
+({									\
+	pte_t pte;							\
+									\
+	pte_val(pte) = (page_to_pfn(page) << 32) | pgprot_val(pgprot);	\
+	pte;								\
+})
+
+extern inline pte_t pfn_pte(unsigned long physpfn, pgprot_t pgprot)
+{ pte_t pte; pte_val(pte) = (PHYS_TWIDDLE(physpfn) << 32) | pgprot_val(pgprot); return pte; }
+
+extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
+
+extern inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
+{ pmd_val(*pmdp) = _PAGE_TABLE | ((((unsigned long) ptep) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
+
+extern inline void pud_set(pud_t * pudp, pmd_t * pmdp)
+{ pud_val(*pudp) = _PAGE_TABLE | ((((unsigned long) pmdp) - PAGE_OFFSET) << (32-PAGE_SHIFT)); }
+
+
+extern inline unsigned long
+pmd_page_vaddr(pmd_t pmd)
+{
+	return ((pmd_val(pmd) & _PFN_MASK) >> (32-PAGE_SHIFT)) + PAGE_OFFSET;
+}
+
+#define pmd_pfn(pmd)	(pmd_val(pmd) >> 32)
+#define pmd_page(pmd)	(pfn_to_page(pmd_val(pmd) >> 32))
+#define pud_page(pud)	(pfn_to_page(pud_val(pud) >> 32))
+
+extern inline pmd_t *pud_pgtable(pud_t pgd)
+{
+	return (pmd_t *)(PAGE_OFFSET + ((pud_val(pgd) & _PFN_MASK) >> (32-PAGE_SHIFT)));
+}
+
+extern inline int pte_none(pte_t pte)		{ return !pte_val(pte); }
+extern inline int pte_present(pte_t pte)	{ return pte_val(pte) & _PAGE_VALID; }
+extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	pte_val(*ptep) = 0;
+}
+
+extern inline int pmd_none(pmd_t pmd)		{ return !pmd_val(pmd); }
+extern inline int pmd_bad(pmd_t pmd)		{ return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
+extern inline int pmd_present(pmd_t pmd)	{ return pmd_val(pmd) & _PAGE_VALID; }
+extern inline void pmd_clear(pmd_t * pmdp)	{ pmd_val(*pmdp) = 0; }
+
+extern inline int pud_none(pud_t pud)		{ return !pud_val(pud); }
+extern inline int pud_bad(pud_t pud)		{ return (pud_val(pud) & ~_PFN_MASK) != _PAGE_TABLE; }
+extern inline int pud_present(pud_t pud)	{ return pud_val(pud) & _PAGE_VALID; }
+extern inline void pud_clear(pud_t * pudp)	{ pud_val(*pudp) = 0; }
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+extern inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_FOW); }
+extern inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
+extern inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
+
+extern inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_FOW; return pte; }
+extern inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
+extern inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
+extern inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_FOW; return pte; }
+extern inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= __DIRTY_BITS; return pte; }
+extern inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= __ACCESS_BITS; return pte; }
+
+/*
+ * The smp_rmb() in the following functions are required to order the load of
+ * *dir (the pointer in the top level page table) with any subsequent load of
+ * the returned pmd_t *ret (ret is data dependent on *dir).
+ *
+ * If this ordering is not enforced, the CPU might load an older value of
+ * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
+ * more details.
+ *
+ * Note that we never change the mm->pgd pointer after the task is running, so
+ * pgd_offset does not require such a barrier.
+ */
+
+/* Find an entry in the second-level page table.. */
+extern inline pmd_t * pmd_offset(pud_t * dir, unsigned long address)
+{
+	pmd_t *ret = pud_pgtable(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
+	smp_rmb(); /* see above */
+	return ret;
+}
+#define pmd_offset pmd_offset
+
+/* Find an entry in the third-level page table.. */
+extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
+{
+	pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
+		+ ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
+	smp_rmb(); /* see above */
+	return ret;
+}
+#define pte_offset_kernel pte_offset_kernel
+
+extern pgd_t swapper_pg_dir[1024];
+
+/*
+ * The Alpha doesn't have any external MMU info:  the kernel page
+ * tables contain all the necessary information.
+ */
+extern inline void update_mmu_cache(struct vm_area_struct * vma,
+	unsigned long address, pte_t *ptep)
+{
+}
+
+/*
+ * Non-present pages:  high 24 bits are offset, next 8 bits type,
+ * low 32 bits zero.
+ */
+extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
+{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; }
+
+#define __swp_type(x)		(((x).val >> 32) & 0xff)
+#define __swp_offset(x)		((x).val >> 40)
+#define __swp_entry(type, off)	((swp_entry_t) { pte_val(mk_swap_pte((type), (off))) })
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
+
+#define pte_ERROR(e) \
+	printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+	printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+extern void paging_init(void);
+
+/* We have our own get_unmapped_area to cope with ADDR_LIMIT_32BIT.  */
+#define HAVE_ARCH_UNMAPPED_AREA
+
+#endif /* _ALPHA_PGTABLE_H */