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, 330 insertions, 0 deletions

diff --git a/scripts/tags.sh b/scripts/tags.sh
new file mode 100755
index 000000000..e137cf15a
--- /dev/null
+++ b/scripts/tags.sh
@@ -0,0 +1,330 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+# Generate tags or cscope files
+# Usage tags.sh <mode>
+#
+# mode may be any of: tags, TAGS, cscope
+#
+# Uses the following environment variables:
+# SUBARCH, SRCARCH, srctree
+
+if [ "$KBUILD_VERBOSE" = "1" ]; then
+	set -x
+fi
+
+# RCS_FIND_IGNORE has escaped ()s -- remove them.
+ignore="$(echo "$RCS_FIND_IGNORE" | sed 's|\\||g' )"
+# tags and cscope files should also ignore MODVERSION *.mod.c files
+ignore="$ignore ( -name *.mod.c ) -prune -o"
+
+# Use make KBUILD_ABS_SRCTREE=1 {tags|cscope}
+# to force full paths for a non-O= build
+if [ "${srctree}" = "." -o -z "${srctree}" ]; then
+	tree=
+else
+	tree=${srctree}/
+fi
+
+# Detect if ALLSOURCE_ARCHS is set. If not, we assume SRCARCH
+if [ "${ALLSOURCE_ARCHS}" = "" ]; then
+	ALLSOURCE_ARCHS=${SRCARCH}
+elif [ "${ALLSOURCE_ARCHS}" = "all" ]; then
+	ALLSOURCE_ARCHS=$(find ${tree}arch/ -mindepth 1 -maxdepth 1 -type d -printf '%f ')
+fi
+
+# find sources in arch/$1
+find_arch_sources()
+{
+	for i in $archincludedir; do
+		prune="$prune -wholename $i -prune -o"
+	done
+	find ${tree}arch/$1 $ignore $prune -name "$2" -not -type l -print;
+}
+
+# find sources in arch/$1/include
+find_arch_include_sources()
+{
+	include=$(find ${tree}arch/$1/ -name include -type d -print);
+	if [ -n "$include" ]; then
+		archincludedir="$archincludedir $include"
+		find $include $ignore -name "$2" -not -type l -print;
+	fi
+}
+
+# find sources in include/
+find_include_sources()
+{
+	find ${tree}include $ignore -name config -prune -o -name "$1" \
+		-not -type l -print;
+}
+
+# find sources in rest of tree
+# we could benefit from a list of dirs to search in here
+find_other_sources()
+{
+	find ${tree}* $ignore \
+	     \( -path ${tree}include -o -path ${tree}arch -o -name '.tmp_*' \) -prune -o \
+	       -name "$1" -not -type l -print;
+}
+
+find_sources()
+{
+	find_arch_sources $1 "$2"
+}
+
+all_sources()
+{
+	find_arch_include_sources ${SRCARCH} '*.[chS]'
+	if [ ! -z "$archinclude" ]; then
+		find_arch_include_sources $archinclude '*.[chS]'
+	fi
+	find_include_sources '*.[chS]'
+	for arch in $ALLSOURCE_ARCHS
+	do
+		find_sources $arch '*.[chS]'
+	done
+	find_other_sources '*.[chS]'
+}
+
+all_compiled_sources()
+{
+	{
+		echo include/generated/autoconf.h
+		find $ignore -name "*.cmd" -exec \
+			grep -Poh '(?(?=^source_.* \K).*|(?=^  \K\S).*(?= \\))' {} \+ |
+		awk '!a[$0]++'
+	} | xargs realpath -esq $([ -z "$KBUILD_ABS_SRCTREE" ] && echo --relative-to=.) |
+	sort -u
+}
+
+all_target_sources()
+{
+	if [ -n "$COMPILED_SOURCE" ]; then
+		all_compiled_sources
+	else
+		all_sources
+	fi
+}
+
+all_kconfigs()
+{
+	find ${tree}arch/ -maxdepth 1 $ignore \
+	       -name "Kconfig*" -not -type l -print;
+	for arch in $ALLSOURCE_ARCHS; do
+		find_sources $arch 'Kconfig*'
+	done
+	find_other_sources 'Kconfig*'
+}
+
+docscope()
+{
+	(echo \-k; echo \-q; all_target_sources) > cscope.files
+	cscope -b -f cscope.out
+}
+
+dogtags()
+{
+	all_target_sources | gtags -i -f -
+}
+
+# Basic regular expressions with an optional /kind-spec/ for ctags and
+# the following limitations:
+# - No regex modifiers
+# - Use \{0,1\} instead of \?, because etags expects an unescaped ?
+# - \s is not working with etags, use a space or [ \t]
+# - \w works, but does not match underscores in etags
+# - etags regular expressions have to match at the start of a line;
+#   a ^[^#] is prepended by setup_regex unless an anchor is already present
+regex_asm=(
+	'/^\(ENTRY\|_GLOBAL\)([[:space:]]*\([[:alnum:]_\\]*\)).*/\2/'
+)
+regex_c=(
+	'/^SYSCALL_DEFINE[0-9]([[:space:]]*\([[:alnum:]_]*\).*/sys_\1/'
+	'/^BPF_CALL_[0-9]([[:space:]]*\([[:alnum:]_]*\).*/\1/'
+	'/^COMPAT_SYSCALL_DEFINE[0-9]([[:space:]]*\([[:alnum:]_]*\).*/compat_sys_\1/'
+	'/^TRACE_EVENT([[:space:]]*\([[:alnum:]_]*\).*/trace_\1/'
+	'/^TRACE_EVENT([[:space:]]*\([[:alnum:]_]*\).*/trace_\1_rcuidle/'
+	'/^DEFINE_EVENT([^,)]*,[[:space:]]*\([[:alnum:]_]*\).*/trace_\1/'
+	'/^DEFINE_EVENT([^,)]*,[[:space:]]*\([[:alnum:]_]*\).*/trace_\1_rcuidle/'
+	'/^DEFINE_INSN_CACHE_OPS([[:space:]]*\([[:alnum:]_]*\).*/get_\1_slot/'
+	'/^DEFINE_INSN_CACHE_OPS([[:space:]]*\([[:alnum:]_]*\).*/free_\1_slot/'
+	'/^PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/Page\1/'
+	'/^PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/SetPage\1/'
+	'/^PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/ClearPage\1/'
+	'/^TESTSETFLAG([[:space:]]*\([[:alnum:]_]*\).*/TestSetPage\1/'
+	'/^TESTPAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/Page\1/'
+	'/^SETPAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/SetPage\1/'
+	'/\<__SETPAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/__SetPage\1/'
+	'/\<TESTCLEARFLAG([[:space:]]*\([[:alnum:]_]*\).*/TestClearPage\1/'
+	'/\<__TESTCLEARFLAG([[:space:]]*\([[:alnum:]_]*\).*/TestClearPage\1/'
+	'/\<CLEARPAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/ClearPage\1/'
+	'/\<__CLEARPAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/__ClearPage\1/'
+	'/^__PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/__SetPage\1/'
+	'/^__PAGEFLAG([[:space:]]*\([[:alnum:]_]*\).*/__ClearPage\1/'
+	'/^PAGEFLAG_FALSE([[:space:]]*\([[:alnum:]_]*\).*/Page\1/'
+	'/\<TESTSCFLAG([[:space:]]*\([[:alnum:]_]*\).*/TestSetPage\1/'
+	'/\<TESTSCFLAG([[:space:]]*\([[:alnum:]_]*\).*/TestClearPage\1/'
+	'/\<SETPAGEFLAG_NOOP([[:space:]]*\([[:alnum:]_]*\).*/SetPage\1/'
+	'/\<CLEARPAGEFLAG_NOOP([[:space:]]*\([[:alnum:]_]*\).*/ClearPage\1/'
+	'/\<__CLEARPAGEFLAG_NOOP([[:space:]]*\([[:alnum:]_]*\).*/__ClearPage\1/'
+	'/\<TESTCLEARFLAG_FALSE([[:space:]]*\([[:alnum:]_]*\).*/TestClearPage\1/'
+	'/^PAGE_TYPE_OPS([[:space:]]*\([[:alnum:]_]*\).*/Page\1/'
+	'/^PAGE_TYPE_OPS([[:space:]]*\([[:alnum:]_]*\).*/__SetPage\1/'
+	'/^PAGE_TYPE_OPS([[:space:]]*\([[:alnum:]_]*\).*/__ClearPage\1/'
+	'/^TASK_PFA_TEST([^,]*,[[:space:]]*\([[:alnum:]_]*\))/task_\1/'
+	'/^TASK_PFA_SET([^,]*,[[:space:]]*\([[:alnum:]_]*\))/task_set_\1/'
+	'/^TASK_PFA_CLEAR([^,]*,[[:space:]]*\([[:alnum:]_]*\))/task_clear_\1/'
+	'/^DEF_MMIO_\(IN\|OUT\)_[XD]([[:space:]]*\([[:alnum:]_]*\),[^)]*)/\2/'
+	'/^DEBUGGER_BOILERPLATE([[:space:]]*\([[:alnum:]_]*\))/\1/'
+	'/^DEF_PCI_AC_\(\|NO\)RET([[:space:]]*\([[:alnum:]_]*\).*/\2/'
+	'/^PCI_OP_READ([[:space:]]*\(\w*\).*[1-4])/pci_bus_read_config_\1/'
+	'/^PCI_OP_WRITE([[:space:]]*\(\w*\).*[1-4])/pci_bus_write_config_\1/'
+	'/\<DEFINE_\(RT_MUTEX\|MUTEX\|SEMAPHORE\|SPINLOCK\)([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\<DEFINE_\(RAW_SPINLOCK\|RWLOCK\|SEQLOCK\)([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\<DECLARE_\(RWSEM\|COMPLETION\)([[:space:]]*\([[:alnum:]_]\+\)/\2/v/'
+	'/\<DECLARE_BITMAP([[:space:]]*\([[:alnum:]_]*\)/\1/v/'
+	'/\(^\|\s\)\(\|L\|H\)LIST_HEAD([[:space:]]*\([[:alnum:]_]*\)/\3/v/'
+	'/\(^\|\s\)RADIX_TREE([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\<DEFINE_PER_CPU([^,]*,[[:space:]]*\([[:alnum:]_]*\)/\1/v/'
+	'/\<DEFINE_PER_CPU_SHARED_ALIGNED([^,]*,[[:space:]]*\([[:alnum:]_]*\)/\1/v/'
+	'/\<DECLARE_WAIT_QUEUE_HEAD([[:space:]]*\([[:alnum:]_]*\)/\1/v/'
+	'/\<DECLARE_\(TASKLET\|WORK\|DELAYED_WORK\)([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\(^\s\)OFFSET([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\(^\s\)DEFINE([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\<\(DEFINE\|DECLARE\)_HASHTABLE([[:space:]]*\([[:alnum:]_]*\)/\2/v/'
+	'/\<DEFINE_ID\(R\|A\)([[:space:]]*\([[:alnum:]_]\+\)/\2/'
+	'/\<DEFINE_WD_CLASS([[:space:]]*\([[:alnum:]_]\+\)/\1/'
+	'/\<ATOMIC_NOTIFIER_HEAD([[:space:]]*\([[:alnum:]_]\+\)/\1/'
+	'/\<RAW_NOTIFIER_HEAD([[:space:]]*\([[:alnum:]_]\+\)/\1/'
+	'/\<DECLARE_FAULT_ATTR([[:space:]]*\([[:alnum:]_]\+\)/\1/'
+	'/\<BLOCKING_NOTIFIER_HEAD([[:space:]]*\([[:alnum:]_]\+\)/\1/'
+	'/\<DEVICE_ATTR_\(RW\|RO\|WO\)([[:space:]]*\([[:alnum:]_]\+\)/dev_attr_\2/'
+	'/\<DRIVER_ATTR_\(RW\|RO\|WO\)([[:space:]]*\([[:alnum:]_]\+\)/driver_attr_\2/'
+	'/\<\(DEFINE\|DECLARE\)_STATIC_KEY_\(TRUE\|FALSE\)\(\|_RO\)([[:space:]]*\([[:alnum:]_]\+\)/\4/'
+	'/^SEQCOUNT_LOCKTYPE(\([^,]*\),[[:space:]]*\([^,]*\),[^)]*)/seqcount_\2_t/'
+	'/^SEQCOUNT_LOCKTYPE(\([^,]*\),[[:space:]]*\([^,]*\),[^)]*)/seqcount_\2_init/'
+)
+regex_kconfig=(
+	'/^[[:blank:]]*\(menu\|\)config[[:blank:]]\+\([[:alnum:]_]\+\)/\2/'
+	'/^[[:blank:]]*\(menu\|\)config[[:blank:]]\+\([[:alnum:]_]\+\)/CONFIG_\2/'
+)
+setup_regex()
+{
+	local mode=$1 lang tmp=() r
+	shift
+
+	regex=()
+	for lang; do
+		case "$lang" in
+		asm)       tmp=("${regex_asm[@]}") ;;
+		c)         tmp=("${regex_c[@]}") ;;
+		kconfig)   tmp=("${regex_kconfig[@]}") ;;
+		esac
+		for r in "${tmp[@]}"; do
+			if test "$mode" = "exuberant"; then
+				regex[${#regex[@]}]="--regex-$lang=${r}b"
+			else
+				# Remove ctags /kind-spec/
+				case "$r" in
+				/*/*/?/)
+					r=${r%?/}
+				esac
+				# Prepend ^[^#] unless already anchored
+				case "$r" in
+				/^*) ;;
+				*)
+					r="/^[^#]*${r#/}"
+				esac
+				regex[${#regex[@]}]="--regex=$r"
+			fi
+		done
+	done
+}
+
+exuberant()
+{
+	CTAGS_EXTRA="extra"
+	if $1 --version 2>&1 | grep -iq universal; then
+	    CTAGS_EXTRA="extras"
+	fi
+	setup_regex exuberant asm c
+	all_target_sources | xargs $1 -a                        \
+	-I __initdata,__exitdata,__initconst,__ro_after_init	\
+	-I __initdata_memblock					\
+	-I __refdata,__attribute,__maybe_unused,__always_unused \
+	-I __acquires,__releases,__deprecated,__always_inline	\
+	-I __read_mostly,__aligned,____cacheline_aligned        \
+	-I ____cacheline_aligned_in_smp                         \
+	-I __cacheline_aligned,__cacheline_aligned_in_smp	\
+	-I ____cacheline_internodealigned_in_smp                \
+	-I __used,__packed,__packed2__,__must_check,__must_hold	\
+	-I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL,ACPI_EXPORT_SYMBOL   \
+	-I DEFINE_TRACE,EXPORT_TRACEPOINT_SYMBOL,EXPORT_TRACEPOINT_SYMBOL_GPL \
+	-I static,const						\
+	--$CTAGS_EXTRA=+fq --c-kinds=+px --fields=+iaS --langmap=c:+.h \
+	"${regex[@]}"
+
+	setup_regex exuberant kconfig
+	all_kconfigs | xargs $1 -a                              \
+	--langdef=kconfig --language-force=kconfig "${regex[@]}"
+
+}
+
+emacs()
+{
+	setup_regex emacs asm c
+	all_target_sources | xargs $1 -a "${regex[@]}"
+
+	setup_regex emacs kconfig
+	all_kconfigs | xargs $1 -a "${regex[@]}"
+}
+
+xtags()
+{
+	if $1 --version 2>&1 | grep -iq exuberant; then
+		exuberant $1
+	elif $1 --version 2>&1 | grep -iq emacs; then
+		emacs $1
+	else
+		all_target_sources | xargs $1 -a
+	fi
+}
+
+# Support um (which uses SUBARCH)
+if [ "${ARCH}" = "um" ]; then
+	if [ "$SUBARCH" = "i386" ]; then
+		archinclude=x86
+	elif [ "$SUBARCH" = "x86_64" ]; then
+		archinclude=x86
+	else
+		archinclude=${SUBARCH}
+	fi
+fi
+
+remove_structs=
+case "$1" in
+	"cscope")
+		docscope
+		;;
+
+	"gtags")
+		dogtags
+		;;
+
+	"tags")
+		rm -f tags
+		xtags ctags
+		remove_structs=y
+		;;
+
+	"TAGS")
+		rm -f TAGS
+		xtags etags
+		remove_structs=y
+		;;
+esac
+
+# Remove structure forward declarations.
+if [ -n "$remove_structs" ]; then
+    LC_ALL=C sed -i -e '/^\([a-zA-Z_][a-zA-Z0-9_]*\)\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1
+fi