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, 831 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/dsutils.c b/drivers/acpi/acpica/dsutils.c
new file mode 100644
index 000000000..fb9ed5e1d
--- /dev/null
+++ b/drivers/acpi/acpica/dsutils.c
@@ -0,0 +1,831 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: dsutils - Dispatcher utilities
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acparser.h"
+#include "amlcode.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+#include "acdebug.h"
+
+#define _COMPONENT          ACPI_DISPATCHER
+ACPI_MODULE_NAME("dsutils")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_clear_implicit_return
+ *
+ * PARAMETERS:  walk_state          - Current State
+ *
+ * RETURN:      None.
+ *
+ * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
+ *              to delete "stale" return values (if enabled, the return value
+ *              from every operator is saved at least momentarily, in case the
+ *              parent method exits.)
+ *
+ ******************************************************************************/
+void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state)
+{
+	ACPI_FUNCTION_NAME(ds_clear_implicit_return);
+
+	/*
+	 * Slack must be enabled for this feature
+	 */
+	if (!acpi_gbl_enable_interpreter_slack) {
+		return;
+	}
+
+	if (walk_state->implicit_return_obj) {
+		/*
+		 * Delete any "stale" implicit return. However, in
+		 * complex statements, the implicit return value can be
+		 * bubbled up several levels.
+		 */
+		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+				  "Removing reference on stale implicit return obj %p\n",
+				  walk_state->implicit_return_obj));
+
+		acpi_ut_remove_reference(walk_state->implicit_return_obj);
+		walk_state->implicit_return_obj = NULL;
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_do_implicit_return
+ *
+ * PARAMETERS:  return_desc         - The return value
+ *              walk_state          - Current State
+ *              add_reference       - True if a reference should be added to the
+ *                                    return object
+ *
+ * RETURN:      TRUE if implicit return enabled, FALSE otherwise
+ *
+ * DESCRIPTION: Implements the optional "implicit return".  We save the result
+ *              of every ASL operator and control method invocation in case the
+ *              parent method exit. Before storing a new return value, we
+ *              delete the previous return value.
+ *
+ ******************************************************************************/
+
+u8
+acpi_ds_do_implicit_return(union acpi_operand_object *return_desc,
+			   struct acpi_walk_state *walk_state, u8 add_reference)
+{
+	ACPI_FUNCTION_NAME(ds_do_implicit_return);
+
+	/*
+	 * Slack must be enabled for this feature, and we must
+	 * have a valid return object
+	 */
+	if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) {
+		return (FALSE);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+			  "Result %p will be implicitly returned; Prev=%p\n",
+			  return_desc, walk_state->implicit_return_obj));
+
+	/*
+	 * Delete any "stale" implicit return value first. However, in
+	 * complex statements, the implicit return value can be
+	 * bubbled up several levels, so we don't clear the value if it
+	 * is the same as the return_desc.
+	 */
+	if (walk_state->implicit_return_obj) {
+		if (walk_state->implicit_return_obj == return_desc) {
+			return (TRUE);
+		}
+		acpi_ds_clear_implicit_return(walk_state);
+	}
+
+	/* Save the implicit return value, add a reference if requested */
+
+	walk_state->implicit_return_obj = return_desc;
+	if (add_reference) {
+		acpi_ut_add_reference(return_desc);
+	}
+
+	return (TRUE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_is_result_used
+ *
+ * PARAMETERS:  op                  - Current Op
+ *              walk_state          - Current State
+ *
+ * RETURN:      TRUE if result is used, FALSE otherwise
+ *
+ * DESCRIPTION: Check if a result object will be used by the parent
+ *
+ ******************************************************************************/
+
+u8
+acpi_ds_is_result_used(union acpi_parse_object * op,
+		       struct acpi_walk_state * walk_state)
+{
+	const struct acpi_opcode_info *parent_info;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_is_result_used, op);
+
+	/* Must have both an Op and a Result Object */
+
+	if (!op) {
+		ACPI_ERROR((AE_INFO, "Null Op"));
+		return_UINT8(TRUE);
+	}
+
+	/*
+	 * We know that this operator is not a
+	 * Return() operator (would not come here.) The following code is the
+	 * optional support for a so-called "implicit return". Some AML code
+	 * assumes that the last value of the method is "implicitly" returned
+	 * to the caller. Just save the last result as the return value.
+	 * NOTE: this is optional because the ASL language does not actually
+	 * support this behavior.
+	 */
+	(void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state,
+					 TRUE);
+
+	/*
+	 * Now determine if the parent will use the result
+	 *
+	 * If there is no parent, or the parent is a scope_op, we are executing
+	 * at the method level. An executing method typically has no parent,
+	 * since each method is parsed separately. A method invoked externally
+	 * via execute_control_method has a scope_op as the parent.
+	 */
+	if ((!op->common.parent) ||
+	    (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) {
+
+		/* No parent, the return value cannot possibly be used */
+
+		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+				  "At Method level, result of [%s] not used\n",
+				  acpi_ps_get_opcode_name(op->common.
+							  aml_opcode)));
+		return_UINT8(FALSE);
+	}
+
+	/* Get info on the parent. The root_op is AML_SCOPE */
+
+	parent_info =
+	    acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode);
+	if (parent_info->class == AML_CLASS_UNKNOWN) {
+		ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op));
+		return_UINT8(FALSE);
+	}
+
+	/*
+	 * Decide what to do with the result based on the parent. If
+	 * the parent opcode will not use the result, delete the object.
+	 * Otherwise leave it as is, it will be deleted when it is used
+	 * as an operand later.
+	 */
+	switch (parent_info->class) {
+	case AML_CLASS_CONTROL:
+
+		switch (op->common.parent->common.aml_opcode) {
+		case AML_RETURN_OP:
+
+			/* Never delete the return value associated with a return opcode */
+
+			goto result_used;
+
+		case AML_IF_OP:
+		case AML_WHILE_OP:
+			/*
+			 * If we are executing the predicate AND this is the predicate op,
+			 * we will use the return value
+			 */
+			if ((walk_state->control_state->common.state ==
+			     ACPI_CONTROL_PREDICATE_EXECUTING) &&
+			    (walk_state->control_state->control.predicate_op ==
+			     op)) {
+				goto result_used;
+			}
+			break;
+
+		default:
+
+			/* Ignore other control opcodes */
+
+			break;
+		}
+
+		/* The general control opcode returns no result */
+
+		goto result_not_used;
+
+	case AML_CLASS_CREATE:
+		/*
+		 * These opcodes allow term_arg(s) as operands and therefore
+		 * the operands can be method calls. The result is used.
+		 */
+		goto result_used;
+
+	case AML_CLASS_NAMED_OBJECT:
+
+		if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
+		    (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP)
+		    || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP)
+		    || (op->common.parent->common.aml_opcode == AML_BUFFER_OP)
+		    || (op->common.parent->common.aml_opcode ==
+			AML_VARIABLE_PACKAGE_OP)
+		    || (op->common.parent->common.aml_opcode ==
+			AML_INT_EVAL_SUBTREE_OP)
+		    || (op->common.parent->common.aml_opcode ==
+			AML_BANK_FIELD_OP)) {
+			/*
+			 * These opcodes allow term_arg(s) as operands and therefore
+			 * the operands can be method calls. The result is used.
+			 */
+			goto result_used;
+		}
+
+		goto result_not_used;
+
+	default:
+		/*
+		 * In all other cases. the parent will actually use the return
+		 * object, so keep it.
+		 */
+		goto result_used;
+	}
+
+result_used:
+	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+			  "Result of [%s] used by Parent [%s] Op=%p\n",
+			  acpi_ps_get_opcode_name(op->common.aml_opcode),
+			  acpi_ps_get_opcode_name(op->common.parent->common.
+						  aml_opcode), op));
+
+	return_UINT8(TRUE);
+
+result_not_used:
+	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+			  "Result of [%s] not used by Parent [%s] Op=%p\n",
+			  acpi_ps_get_opcode_name(op->common.aml_opcode),
+			  acpi_ps_get_opcode_name(op->common.parent->common.
+						  aml_opcode), op));
+
+	return_UINT8(FALSE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_delete_result_if_not_used
+ *
+ * PARAMETERS:  op              - Current parse Op
+ *              result_obj      - Result of the operation
+ *              walk_state      - Current state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
+ *              result descriptor, check if the parent opcode will actually use
+ *              this result. If not, delete the result now so that it will
+ *              not become orphaned.
+ *
+ ******************************************************************************/
+
+void
+acpi_ds_delete_result_if_not_used(union acpi_parse_object *op,
+				  union acpi_operand_object *result_obj,
+				  struct acpi_walk_state *walk_state)
+{
+	union acpi_operand_object *obj_desc;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_delete_result_if_not_used, result_obj);
+
+	if (!op) {
+		ACPI_ERROR((AE_INFO, "Null Op"));
+		return_VOID;
+	}
+
+	if (!result_obj) {
+		return_VOID;
+	}
+
+	if (!acpi_ds_is_result_used(op, walk_state)) {
+
+		/* Must pop the result stack (obj_desc should be equal to result_obj) */
+
+		status = acpi_ds_result_pop(&obj_desc, walk_state);
+		if (ACPI_SUCCESS(status)) {
+			acpi_ut_remove_reference(result_obj);
+		}
+	}
+
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_resolve_operands
+ *
+ * PARAMETERS:  walk_state          - Current walk state with operands on stack
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Resolve all operands to their values. Used to prepare
+ *              arguments to a control method invocation (a call from one
+ *              method to another.)
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state)
+{
+	u32 i;
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state);
+
+	/*
+	 * Attempt to resolve each of the valid operands
+	 * Method arguments are passed by reference, not by value. This means
+	 * that the actual objects are passed, not copies of the objects.
+	 */
+	for (i = 0; i < walk_state->num_operands; i++) {
+		status =
+		    acpi_ex_resolve_to_value(&walk_state->operands[i],
+					     walk_state);
+		if (ACPI_FAILURE(status)) {
+			break;
+		}
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_clear_operands
+ *
+ * PARAMETERS:  walk_state          - Current walk state with operands on stack
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Clear all operands on the current walk state operand stack.
+ *
+ ******************************************************************************/
+
+void acpi_ds_clear_operands(struct acpi_walk_state *walk_state)
+{
+	u32 i;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state);
+
+	/* Remove a reference on each operand on the stack */
+
+	for (i = 0; i < walk_state->num_operands; i++) {
+		/*
+		 * Remove a reference to all operands, including both
+		 * "Arguments" and "Targets".
+		 */
+		acpi_ut_remove_reference(walk_state->operands[i]);
+		walk_state->operands[i] = NULL;
+	}
+
+	walk_state->num_operands = 0;
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_create_operand
+ *
+ * PARAMETERS:  walk_state      - Current walk state
+ *              arg             - Parse object for the argument
+ *              arg_index       - Which argument (zero based)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Translate a parse tree object that is an argument to an AML
+ *              opcode to the equivalent interpreter object. This may include
+ *              looking up a name or entering a new name into the internal
+ *              namespace.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_create_operand(struct acpi_walk_state *walk_state,
+		       union acpi_parse_object *arg, u32 arg_index)
+{
+	acpi_status status = AE_OK;
+	char *name_string;
+	u32 name_length;
+	union acpi_operand_object *obj_desc;
+	union acpi_parse_object *parent_op;
+	u16 opcode;
+	acpi_interpreter_mode interpreter_mode;
+	const struct acpi_opcode_info *op_info;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg);
+
+	/* A valid name must be looked up in the namespace */
+
+	if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
+	    (arg->common.value.string) &&
+	    !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n",
+				  arg));
+
+		/* Get the entire name string from the AML stream */
+
+		status = acpi_ex_get_name_string(ACPI_TYPE_ANY,
+						 arg->common.value.buffer,
+						 &name_string, &name_length);
+
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		/* All prefixes have been handled, and the name is in name_string */
+
+		/*
+		 * Special handling for buffer_field declarations. This is a deferred
+		 * opcode that unfortunately defines the field name as the last
+		 * parameter instead of the first. We get here when we are performing
+		 * the deferred execution, so the actual name of the field is already
+		 * in the namespace. We don't want to attempt to look it up again
+		 * because we may be executing in a different scope than where the
+		 * actual opcode exists.
+		 */
+		if ((walk_state->deferred_node) &&
+		    (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD)
+		    && (arg_index == (u32)
+			((walk_state->opcode == AML_CREATE_FIELD_OP) ? 3 : 2))) {
+			obj_desc =
+			    ACPI_CAST_PTR(union acpi_operand_object,
+					  walk_state->deferred_node);
+			status = AE_OK;
+		} else {	/* All other opcodes */
+
+			/*
+			 * Differentiate between a namespace "create" operation
+			 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
+			 * IMODE_EXECUTE) in order to support the creation of
+			 * namespace objects during the execution of control methods.
+			 */
+			parent_op = arg->common.parent;
+			op_info =
+			    acpi_ps_get_opcode_info(parent_op->common.
+						    aml_opcode);
+
+			if ((op_info->flags & AML_NSNODE) &&
+			    (parent_op->common.aml_opcode !=
+			     AML_INT_METHODCALL_OP)
+			    && (parent_op->common.aml_opcode != AML_REGION_OP)
+			    && (parent_op->common.aml_opcode !=
+				AML_INT_NAMEPATH_OP)) {
+
+				/* Enter name into namespace if not found */
+
+				interpreter_mode = ACPI_IMODE_LOAD_PASS2;
+			} else {
+				/* Return a failure if name not found */
+
+				interpreter_mode = ACPI_IMODE_EXECUTE;
+			}
+
+			status =
+			    acpi_ns_lookup(walk_state->scope_info, name_string,
+					   ACPI_TYPE_ANY, interpreter_mode,
+					   ACPI_NS_SEARCH_PARENT |
+					   ACPI_NS_DONT_OPEN_SCOPE, walk_state,
+					   ACPI_CAST_INDIRECT_PTR(struct
+								  acpi_namespace_node,
+								  &obj_desc));
+			/*
+			 * The only case where we pass through (ignore) a NOT_FOUND
+			 * error is for the cond_ref_of opcode.
+			 */
+			if (status == AE_NOT_FOUND) {
+				if (parent_op->common.aml_opcode ==
+				    AML_CONDITIONAL_REF_OF_OP) {
+					/*
+					 * For the Conditional Reference op, it's OK if
+					 * the name is not found;  We just need a way to
+					 * indicate this to the interpreter, set the
+					 * object to the root
+					 */
+					obj_desc =
+					    ACPI_CAST_PTR(union
+								 acpi_operand_object,
+								 acpi_gbl_root_node);
+					status = AE_OK;
+				} else if (parent_op->common.aml_opcode ==
+					   AML_EXTERNAL_OP) {
+					/*
+					 * This opcode should never appear here. It is used only
+					 * by AML disassemblers and is surrounded by an If(0)
+					 * by the ASL compiler.
+					 *
+					 * Therefore, if we see it here, it is a serious error.
+					 */
+					status = AE_AML_BAD_OPCODE;
+				} else {
+					/*
+					 * We just plain didn't find it -- which is a
+					 * very serious error at this point
+					 */
+					status = AE_AML_NAME_NOT_FOUND;
+				}
+			}
+
+			if (ACPI_FAILURE(status)) {
+				ACPI_ERROR_NAMESPACE(walk_state->scope_info,
+						     name_string, status);
+			}
+		}
+
+		/* Free the namestring created above */
+
+		ACPI_FREE(name_string);
+
+		/* Check status from the lookup */
+
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		/* Put the resulting object onto the current object stack */
+
+		status = acpi_ds_obj_stack_push(obj_desc, walk_state);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		acpi_db_display_argument_object(obj_desc, walk_state);
+	} else {
+		/* Check for null name case */
+
+		if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
+		    !(arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
+			/*
+			 * If the name is null, this means that this is an
+			 * optional result parameter that was not specified
+			 * in the original ASL. Create a Zero Constant for a
+			 * placeholder. (Store to a constant is a Noop.)
+			 */
+			opcode = AML_ZERO_OP;	/* Has no arguments! */
+
+			ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+					  "Null namepath: Arg=%p\n", arg));
+		} else {
+			opcode = arg->common.aml_opcode;
+		}
+
+		/* Get the object type of the argument */
+
+		op_info = acpi_ps_get_opcode_info(opcode);
+		if (op_info->object_type == ACPI_TYPE_INVALID) {
+			return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
+		}
+
+		if ((op_info->flags & AML_HAS_RETVAL) ||
+		    (arg->common.flags & ACPI_PARSEOP_IN_STACK)) {
+			/*
+			 * Use value that was already previously returned
+			 * by the evaluation of this argument
+			 */
+			status = acpi_ds_result_pop(&obj_desc, walk_state);
+			if (ACPI_FAILURE(status)) {
+				/*
+				 * Only error is underflow, and this indicates
+				 * a missing or null operand!
+				 */
+				ACPI_EXCEPTION((AE_INFO, status,
+						"Missing or null operand"));
+				return_ACPI_STATUS(status);
+			}
+		} else {
+			/* Create an ACPI_INTERNAL_OBJECT for the argument */
+
+			obj_desc =
+			    acpi_ut_create_internal_object(op_info->
+							   object_type);
+			if (!obj_desc) {
+				return_ACPI_STATUS(AE_NO_MEMORY);
+			}
+
+			/* Initialize the new object */
+
+			status =
+			    acpi_ds_init_object_from_op(walk_state, arg, opcode,
+							&obj_desc);
+			if (ACPI_FAILURE(status)) {
+				acpi_ut_delete_object_desc(obj_desc);
+				return_ACPI_STATUS(status);
+			}
+		}
+
+		/* Put the operand object on the object stack */
+
+		status = acpi_ds_obj_stack_push(obj_desc, walk_state);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		acpi_db_display_argument_object(obj_desc, walk_state);
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_create_operands
+ *
+ * PARAMETERS:  walk_state          - Current state
+ *              first_arg           - First argument of a parser argument tree
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Convert an operator's arguments from a parse tree format to
+ *              namespace objects and place those argument object on the object
+ *              stack in preparation for evaluation by the interpreter.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_create_operands(struct acpi_walk_state *walk_state,
+			union acpi_parse_object *first_arg)
+{
+	acpi_status status = AE_OK;
+	union acpi_parse_object *arg;
+	union acpi_parse_object *arguments[ACPI_OBJ_NUM_OPERANDS];
+	u32 arg_count = 0;
+	u32 index = walk_state->num_operands;
+	u32 i;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg);
+
+	/* Get all arguments in the list */
+
+	arg = first_arg;
+	while (arg) {
+		if (index >= ACPI_OBJ_NUM_OPERANDS) {
+			return_ACPI_STATUS(AE_BAD_DATA);
+		}
+
+		arguments[index] = arg;
+		walk_state->operands[index] = NULL;
+
+		/* Move on to next argument, if any */
+
+		arg = arg->common.next;
+		arg_count++;
+		index++;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+			  "NumOperands %d, ArgCount %d, Index %d\n",
+			  walk_state->num_operands, arg_count, index));
+
+	/* Create the interpreter arguments, in reverse order */
+
+	index--;
+	for (i = 0; i < arg_count; i++) {
+		arg = arguments[index];
+		walk_state->operand_index = (u8)index;
+
+		status = acpi_ds_create_operand(walk_state, arg, index);
+		if (ACPI_FAILURE(status)) {
+			goto cleanup;
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
+				  "Created Arg #%u (%p) %u args total\n",
+				  index, arg, arg_count));
+		index--;
+	}
+
+	return_ACPI_STATUS(status);
+
+cleanup:
+	/*
+	 * We must undo everything done above; meaning that we must
+	 * pop everything off of the operand stack and delete those
+	 * objects
+	 */
+	acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state);
+
+	ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index));
+	return_ACPI_STATUS(status);
+}
+
+/*****************************************************************************
+ *
+ * FUNCTION:    acpi_ds_evaluate_name_path
+ *
+ * PARAMETERS:  walk_state      - Current state of the parse tree walk,
+ *                                the opcode of current operation should be
+ *                                AML_INT_NAMEPATH_OP
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Translate the -name_path- parse tree object to the equivalent
+ *              interpreter object, convert it to value, if needed, duplicate
+ *              it, if needed, and push it onto the current result stack.
+ *
+ ****************************************************************************/
+
+acpi_status acpi_ds_evaluate_name_path(struct acpi_walk_state *walk_state)
+{
+	acpi_status status = AE_OK;
+	union acpi_parse_object *op = walk_state->op;
+	union acpi_operand_object **operand = &walk_state->operands[0];
+	union acpi_operand_object *new_obj_desc;
+	u8 type;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_evaluate_name_path, walk_state);
+
+	if (!op->common.parent) {
+
+		/* This happens after certain exception processing */
+
+		goto exit;
+	}
+
+	if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
+	    (op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP) ||
+	    (op->common.parent->common.aml_opcode == AML_REF_OF_OP)) {
+
+		/* TBD: Should we specify this feature as a bit of op_info->Flags of these opcodes? */
+
+		goto exit;
+	}
+
+	status = acpi_ds_create_operand(walk_state, op, 0);
+	if (ACPI_FAILURE(status)) {
+		goto exit;
+	}
+
+	if (op->common.flags & ACPI_PARSEOP_TARGET) {
+		new_obj_desc = *operand;
+		goto push_result;
+	}
+
+	type = (*operand)->common.type;
+
+	status = acpi_ex_resolve_to_value(operand, walk_state);
+	if (ACPI_FAILURE(status)) {
+		goto exit;
+	}
+
+	if (type == ACPI_TYPE_INTEGER) {
+
+		/* It was incremented by acpi_ex_resolve_to_value */
+
+		acpi_ut_remove_reference(*operand);
+
+		status =
+		    acpi_ut_copy_iobject_to_iobject(*operand, &new_obj_desc,
+						    walk_state);
+		if (ACPI_FAILURE(status)) {
+			goto exit;
+		}
+	} else {
+		/*
+		 * The object either was anew created or is
+		 * a Namespace node - don't decrement it.
+		 */
+		new_obj_desc = *operand;
+	}
+
+	/* Cleanup for name-path operand */
+
+	status = acpi_ds_obj_stack_pop(1, walk_state);
+	if (ACPI_FAILURE(status)) {
+		walk_state->result_obj = new_obj_desc;
+		goto exit;
+	}
+
+push_result:
+
+	walk_state->result_obj = new_obj_desc;
+
+	status = acpi_ds_result_push(walk_state->result_obj, walk_state);
+	if (ACPI_SUCCESS(status)) {
+
+		/* Force to take it from stack */
+
+		op->common.flags |= ACPI_PARSEOP_IN_STACK;
+	}
+
+exit:
+
+	return_ACPI_STATUS(status);
+}