Simplify the code and the sysctl semantics by autogenerating
sysctl directories when a sysctl table is registered that needs
the directories and autodeleting the directories when there are
no more sysctl tables registered that need them.
Autogenerating directories keeps sysctl tables from depending
on each other, removing all of the arcane register/unregister
ordering constraints and makes it impossible to get the order
wrong when reigsering and unregistering sysctl tables.
Autogenerating directories yields one unique entity that dentries
can point to, retaining the current effective use of the dcache.
Add struct ctl_dir as the type of these new autogenerated
directories.
The attached_by and attached_to fields in ctl_table_header are
removed as they are no longer needed.
The child field in ctl_table is no longer needed by the core of
the sysctl code. ctl_table.child can be removed once all of the
existing users have been updated.
Benchmark before:
make-dummies 0 999 -> 0.7s
rmmod dummy -> 0.07s
make-dummies 0 9999 -> 1m10s
rmmod dummy -> 0.4s
Benchmark after:
make-dummies 0 999 -> 0.44s
rmmod dummy -> 0.065s
make-dummies 0 9999 -> 1m36s
rmmod dummy -> 0.4s
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Add a ctl_table_root pointer to ctl_table set so it is easy to
go from a ctl_table_set to a ctl_table_root.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Replace sysctl_head_next with first_entry and next_entry. These new
iterators operate at the level of sysctl table entries and filter
out any sysctl tables that should not be shown.
Utilizing two specialized functions instead of a single function removes
conditionals for handling awkward special cases that only come up
at the beginning of iteration, making the iterators easier to read
and understand.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Replace the helpers that proc_sys_lookup uses with helpers that work
in terms of an entire sysctl directory. This is worse for sysctl_lock
hold times but it is much better for code clarity and the code cleanups
to come.
find_in_table is no longer needed so it is removed.
find_entry a general helper to find entries in a directory is added.
lookup_entry is a simple wrapper around find_entry that takes the
sysctl_lock increases the use count if an entry is found and drops
the sysctl_lock.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Every other directory has a .child member and we look at the .child
for our entries. Do the same for the root_table.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Add nreg to ctl_table_header. When nreg drops to 0 the ctl_table_header
will be unregistered.
Factor out drop_sysctl_table from unregister_sysctl_table, and add
the logic for decrementing nreg.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Instead of relying on sysct_head_next(NULL) to magically
return the right header for the root directory instead
explicitly transform NULL into the root directories header.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
While useful at one time for selinux and the sysctl sanity
checks those users no longer use the parent field and we can
safely remove it.
Inspired-by: Lucian Adrian Grijincu <lucian.grijincu@gmil.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
- Stop validating subdirectories now that we only register leaf tables
- Cleanup and improve the duplicate filename check.
* Run the duplicate filename check under the sysctl_lock to guarantee
we never add duplicate names.
* Reduce the duplicate filename check to nearly O(M*N) where M is the
number of entries in tthe table we are registering and N is the
number of entries in the directory before we got there.
- Move the duplicate filename check into it's own function and call
it directtly from __register_sysctl_table
- Kill the config option as the sanity checks are now cheap enough
the config option is unnecessary. The original reason for the config
option was because we had a huge table used to verify the proc filename
to binary sysctl mapping. That table has now evolved into the binary_sysctl
translation layer and is no longer part of the sysctl_check code.
- Tighten up the permission checks. Guarnateeing that files only have read
or write permissions.
- Removed redudant check for parents having a procname as now everything has
a procname.
- Generalize the backtrace logic so that we print a backtrace from
any failure of __register_sysctl_table that was not caused by
a memmory allocation failure. The backtrace allows us to track
down who erroneously registered a sysctl table.
Bechmark before (CONFIG_SYSCTL_CHECK=y):
make-dummies 0 999 -> 12s
rmmod dummy -> 0.08s
Bechmark before (CONFIG_SYSCTL_CHECK=n):
make-dummies 0 999 -> 0.7s
rmmod dummy -> 0.06s
make-dummies 0 99999 -> 1m13s
rmmod dummy -> 0.38s
Benchmark after:
make-dummies 0 999 -> 0.65s
rmmod dummy -> 0.055s
make-dummies 0 9999 -> 1m10s
rmmod dummy -> 0.39s
The sysctl sanity checks now impose no measurable cost.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Split the registration of a complex ctl_table array which may have
arbitrary numbers of directories (->child != NULL) and tables of files
into a series of simpler registrations that only register tables of files.
Graphically:
register('dir', { + file-a
+ file-b
+ subdir1
+ file-c
+ subdir2
+ file-d
+ file-e })
is transformed into:
wrapper->subheaders[0] = register('dir', {file1-a, file1-b})
wrapper->subheaders[1] = register('dir/subdir1', {file-c})
wrapper->subheaders[2] = register('dir/subdir2', {file-d, file-e})
return wrapper
This guarantees that __register_sysctl_table will only see a simple
ctl_table array with all entries having (->child == NULL).
Care was taken to pass the original simple ctl_table arrays to
__register_sysctl_table whenever possible.
This change is derived from a similar patch written
by Lucrian Grijincu.
Inspired-by: Lucian Adrian Grijincu <lucian.grijincu@gmail.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
For any component of table passed to __register_sysctl_paths
that actually serves as a path, add that to the cstring path
that is passed to __register_sysctl_table.
The result is that for most calls to __register_sysctl_paths
we only pass a table to __register_sysctl_table that contains
no child directories.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Make __register_sysctl_table the core sysctl registration operation and
make it take a char * string as path.
Now that binary paths have been banished into the real of backwards
compatibility in kernel/binary_sysctl.c where they can be safely
ignored there is no longer a need to use struct ctl_path to represent
path names when registering ctl_tables.
Start the transition to using normal char * strings to represent
pathnames when registering sysctl tables. Normal strings are easier
to deal with both in the internal sysctl implementation and for
programmers registering sysctl tables.
__register_sysctl_paths is turned into a backwards compatibility wrapper
that converts a ctl_path array into a normal char * string.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Creating local copies of directory names is a good idea for
two reasons.
- The dynamic names used by callers must be copied into new
strings by the callers today to ensure the strings do not
change between register and unregister of the sysctl table.
- Sysctl directories have a potentially different lifetime
than the time between register and unregister of any
particular sysctl table.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
In sysctl_net register the two networking roots in the proper order.
In register_sysctl walk the sysctl sets in the reverse order of the
sysctl roots.
Remove parent from ctl_table_set and setup_sysctl_set as it is no
longer needed.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This adds a small helper retire_sysctl_set to remove the intimate knowledge about
the how a sysctl_set is implemented from net/sysct_net.c
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
I goofed when I made sysctl directories have nlink == 0.
nlink == 0 means the directory has been deleted.
nlink == 1 meands a directory does not count subdirectories.
Use the default nlink == 1 for sysctl directories.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Move the core sysctl code from kernel/sysctl.c and kernel/sysctl_check.c
into fs/proc/proc_sysctl.c.
Currently sysctl maintenance is hampered by the sysctl implementation
being split across 3 files with artificial layering between them.
Consolidate the entire sysctl implementation into 1 file so that
it is easier to see what is going on and hopefully allowing for
simpler maintenance.
For functions that are now only used in fs/proc/proc_sysctl.c remove
their declarations from sysctl.h and make them static in fs/proc/proc_sysctl.c
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Simplify the code by treating the base sysctl table like any other
sysctl table and register it with register_sysctl_table.
To ensure this table is registered early enough to avoid problems
call sysctl_init from proc_sys_init.
Rename sysctl_net.c:sysctl_init() to net_sysctl_init() to avoid
name conflicts now that kernel/sysctl.c:sysctl_init() is no longer
static.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
- In sysctl.h move functions only available if CONFIG_SYSCL
is defined inside of #ifdef CONFIG_SYSCTL
- Move the stub function definitions for !CONFIG_SYSCTL
into sysctl.h and make them static inlines.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Remove checks for conditions that will never happen. If procname is NULL
the loop would already had bailed out, so there's no need to check it
again.
At the same time this also compacts the function find_in_table() by
refactoring it to be easier to read.
Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/accounting, proc: Fix /proc/stat interrupts sum
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tracepoints/module: Fix disabling tracepoints with taint CRAP or OOT
x86/kprobes: Add arch/x86/tools/insn_sanity to .gitignore
x86/kprobes: Fix typo transferred from Intel manual
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, syscall: Need __ARCH_WANT_SYS_IPC for 32 bits
x86, tsc: Fix SMI induced variation in quick_pit_calibrate()
x86, opcode: ANDN and Group 17 in x86-opcode-map.txt
x86/kconfig: Move the ZONE_DMA entry under a menu
x86/UV2: Add accounting for BAU strong nacks
x86/UV2: Ack BAU interrupt earlier
x86/UV2: Remove stale no-resources test for UV2 BAU
x86/UV2: Work around BAU bug
x86/UV2: Fix BAU destination timeout initialization
x86/UV2: Fix new UV2 hardware by using native UV2 broadcast mode
x86: Get rid of dubious one-bit signed bitfield
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
qnx4: don't leak ->BitMap on late failure exits
qnx4: reduce the insane nesting in qnx4_checkroot()
qnx4: di_fname is an array, for crying out loud...
vfs: remove printk from set_nlink()
wake up s_wait_unfrozen when ->freeze_fs fails
In checkin
303395ac3b x86: Generate system call tables and unistd_*.h from tables
the feature macros in <asm/unistd.h> were unified between 32 and 64
bits. Unfortunately 32 bits requires __ARCH_WANT_SYS_IPC and this was
inadvertently dropped.
Reported-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/CALLzPKbeXN5gdngo8uYYU8mAow=XhrwBFBhKfG811f37BubQOg@mail.gmail.com
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
KEYS: Permit key_serial() to be called with a const key pointer
keys: fix user_defined key sparse messages
ima: fix cred sparse warning
MPILIB: Add a missing ENOMEM check
Permit key_serial() to be called with a const key pointer.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
Replace the rcu_assign_pointer() calls with rcu_assign_keypointer().
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
Fix ima_policy.c sparse "warning: dereference of noderef expression"
message, by accessing cred->uid using current_cred().
Changelog v1:
- Change __cred to just cred (based on David Howell's comment)
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Randy Dunlap reports that we get
arch/x86/um/shared/sysdep/ptrace.h:7:20: error: redefinition of 'regs_return_value'
arch/x86/um/shared/sysdep/ptrace.h:7:20: note: previous definition of 'regs_return_value' was here
when compiling UML for x86-64.
Stephen Rothwell root-caused it and says:
"Caused by commit d7e7528bcd ("Audit: push audit success and retcode
into arch ptrace.h") (another patch that was never in linux-next :-().
This file now needs protection against double inclusion."
so let's do as the man says.
Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Analyzed-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (26 commits)
target: Set additional sense length field in sense data
target: Remove legacy device status check from transport_execute_tasks
target: Remove __transport_execute_tasks() for each processing context
target: Remove extra se_device->execute_task_lock access in fast path
target: Drop se_device TCQ queue_depth usage from I/O path
target: Fix possible NULL pointer with __transport_execute_tasks
target: Remove TFO->check_release_cmd() fabric API caller
tcm_fc: Convert ft_send_work to use target_submit_cmd
target: Add target_submit_cmd() for process context fabric submission
target: Make target_put_sess_cmd use target_release_cmd_kref
target: Set response format in INQUIRY response
target: tcm_mod_builder: small fixups
Documentation/target: Fix tcm_mod_builder.py build breakage
target: remove overagressive ____cacheline_aligned annoations
tcm_loop: bump max_sectors
target/configs: remove trailing newline from udev_path and alias
iscsi-target: fix chap identifier simple_strtoul usage
target: remove useless casts
target: simplify target_check_cdb_and_preempt
target: Move core_scsi3_check_cdb_abort_and_preempt
...
This includes initial support for the recently published ACPI 5.0 spec.
In particular, support for the "hardware-reduced" bit that eliminates
the dependency on legacy hardware.
APEI has patches resulting from testing on real hardware.
Plus other random fixes.
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (52 commits)
acpi/apei/einj: Add extensions to EINJ from rev 5.0 of acpi spec
intel_idle: Split up and provide per CPU initialization func
ACPI processor: Remove unneeded variable passed by acpi_processor_hotadd_init V2
ACPI processor: Remove unneeded cpuidle_unregister_driver call
intel idle: Make idle driver more robust
intel_idle: Fix a cast to pointer from integer of different size warning in intel_idle
ACPI: kernel-parameters.txt : Add intel_idle.max_cstate
intel_idle: remove redundant local_irq_disable() call
ACPI processor: Fix error path, also remove sysdev link
ACPI: processor: fix acpi_get_cpuid for UP processor
intel_idle: fix API misuse
ACPI APEI: Convert atomicio routines
ACPI: Export interfaces for ioremapping/iounmapping ACPI registers
ACPI: Fix possible alignment issues with GAS 'address' references
ACPI, ia64: Use SRAT table rev to use 8bit or 16/32bit PXM fields (ia64)
ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64)
ACPI: Store SRAT table revision
ACPI, APEI, Resolve false conflict between ACPI NVS and APEI
ACPI, Record ACPI NVS regions
ACPI, APEI, EINJ, Refine the fix of resource conflict
...
This patch fixes an (ACPI S3) suspend regression introduced in commit
68d6e6713f ("tpm: Introduce function to poll for result of self test")
and occurring with an Infineon TPM and tpm_tis and tpm_infineon drivers
active.
The suspend problem occurred if the TPM was disabled and/or deactivated
and therefore the TPM_PCRRead checking the result of the (asynchronous)
self test returned an error code which then caused the tpm_tis driver to
become inactive and this then seemed to have negatively influenced the
suspend support by the tpm_infineon driver... Besides that the tpm_tis
drive may stay active even if the TPM is disabled and/or deactivated.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The type of 'make_request_fn' changed in 5a7bbad27a ("block: remove
support for bio remapping from ->make_request"), but the merge of the
nvme driver didn't take that into account, and as a result the driver
would compile with a warning:
drivers/block/nvme.c: In function 'nvme_alloc_ns':
drivers/block/nvme.c:1336:2: warning: passing argument 2 of 'blk_queue_make_request' from incompatible pointer type [enabled by default]
include/linux/blkdev.h:830:13: note: expected 'void (*)(struct request_queue *, struct bio *)' but argument is of type 'int (*)(struct request_queue *, struct bio *)'
It's benign, but the warning is annoying.
Reported-by: Stephen Rothwell <sfr@canb.auug.org>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Fix these warnings:
drivers/xen/biomerge.c:14:1: warning: data definition has no type or storage class [enabled by default]
drivers/xen/biomerge.c:14:1: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' [-Wimplicit-int]
drivers/xen/biomerge.c:14:1: warning: parameter names (without types) in function declaration [enabled by default]
And this build error:
ERROR: "xen_biovec_phys_mergeable" [drivers/block/nvme.ko] undefined!
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* 'for-linus/i2c-33' of git://git.fluff.org/bjdooks/linux:
i2c-eg20t: Change-company-name-OKI-SEMICONDUCTOR to LAPIS Semiconductor
i2c-eg20t: Support new device LAPIS Semiconductor ML7831 IOH
i2c-eg20t: modified the setting of transfer rate.
i2c-eg20t: use i2c_add_numbered_adapter to get a fixed bus number
i2c: OMAP: Add DT support for i2c controller
I2C: OMAP: NACK without STP
I2C: OMAP: correct SYSC register offset for OMAP4
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (57 commits)
[media] as3645a: Fix compilation by including slab.h
[media] s5p-fimc: Remove linux/version.h include from fimc-mdevice.c
[media] s5p-mfc: Remove linux/version.h include from s5p_mfc.c
[media] ds3000: using logical && instead of bitwise &
[media] v4l2-ctrls: make control names consistent
[media] DVB: dib0700, add support for Nova-TD LEDs
[media] DVB: dib0700, add corrected Nova-TD frontend_attach
[media] DVB: dib0700, separate stk7070pd initialization
[media] DVB: dib0700, move Nova-TD Stick to a separate set
[media] : add MODULE_FIRMWARE to dib0700
[media] DVB-CORE: remove superfluous DTV_CMDs
[media] s5p-jpeg: adapt to recent videobuf2 changes
[media] s5p-g2d: fixed a bug in controls setting function
[media] s5p-mfc: Fix volatile controls setup
[media] drivers/media/video/s5p-mfc/s5p_mfc.c: adjust double test
[media] drivers/media/video/s5p-fimc/fimc-capture.c: adjust double test
[media] s5p-fimc: Fix incorrect control ID assignment
[media] dvb_frontend: Don't call get_frontend() if idle
[media] DocBook/dvbproperty.xml: Remove DTV_MODULATION from ISDB-T
[media] DocBook/dvbproperty.xml: Fix ISDB-T delivery system parameters
...
Using the correct gpio offset for setting the initial value
of gpio when setting output direction.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
SCSI updates on 20120118
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (49 commits)
[SCSI] libfc: remove redundant timer init for fcp
[SCSI] fcoe: Move fcoe_debug_logging from fcoe.h to fcoe.c
[SCSI] libfc: Declare local functions static
[SCSI] fcoe: fix regression on offload em matching function for initiator/target
[SCSI] qla4xxx: Update driver version to 5.02.00-k12
[SCSI] qla4xxx: Cleanup modinfo display
[SCSI] qla4xxx: Update license
[SCSI] qla4xxx: Clear the RISC interrupt bit during FW init
[SCSI] qla4xxx: Added error logging for firmware abort
[SCSI] qla4xxx: Disable generating pause frames in case of FW hung
[SCSI] qla4xxx: Temperature monitoring for ISP82XX core.
[SCSI] megaraid: fix sparse warnings
[SCSI] sg: convert to kstrtoul_from_user()
[SCSI] don't change sdev starvation list order without request dispatched
[SCSI] isci: fix, prevent port from getting stuck in the 'configuring' state
[SCSI] isci: fix start OOB
[SCSI] isci: fix io failures while wide port links are coming up
[SCSI] isci: allow more time for wide port targets
[SCSI] isci: enable wide port targets
[SCSI] isci: Fix IO fails when pull cable from phy in x4 wideport in MPC mode.
...
* git://git.infradead.org/users/willy/linux-nvme: (105 commits)
NVMe: Set number of queues correctly
NVMe: Version 0.8
NVMe: Set queue flags correctly
NVMe: Simplify nvme_unmap_user_pages
NVMe: Mark the end of the sg list
NVMe: Fix DMA mapping for admin commands
NVMe: Rename IO_TIMEOUT to NVME_IO_TIMEOUT
NVMe: Merge the nvme_bio and nvme_prp data structures
NVMe: Change nvme_completion_fn to take a dev
NVMe: Change get_nvmeq to take a dev instead of a namespace
NVMe: Simplify completion handling
NVMe: Update Identify Controller data structure
NVMe: Implement doorbell stride capability
NVMe: Version 0.7
NVMe: Don't probe namespace 0
Fix calculation of number of pages in a PRP List
NVMe: Create nvme_identify and nvme_get_features functions
NVMe: Fix memory leak in nvme_dev_add()
NVMe: Fix calls to dma_unmap_sg
NVMe: Correct sg list setup in nvme_map_user_pages
...
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (47 commits)
tg3: Fix single-vector MSI-X code
openvswitch: Fix multipart datapath dumps.
ipv6: fix per device IP snmp counters
inetpeer: initialize ->redirect_genid in inet_getpeer()
net: fix NULL-deref in WARN() in skb_gso_segment()
net: WARN if skb_checksum_help() is called on skb requiring segmentation
caif: Remove bad WARN_ON in caif_dev
caif: Fix typo in Vendor/Product-ID for CAIF modems
bnx2x: Disable AN KR work-around for BCM57810
bnx2x: Remove AutoGrEEEn for BCM84833
bnx2x: Remove 100Mb force speed for BCM84833
bnx2x: Fix PFC setting on BCM57840
bnx2x: Fix Super-Isolate mode for BCM84833
net: fix some sparse errors
net: kill duplicate included header
net: sh-eth: Fix build error by the value which is not defined
net: Use device model to get driver name in skb_gso_segment()
bridge: BH already disabled in br_fdb_cleanup()
net: move sock_update_memcg outside of CONFIG_INET
mwl8k: Fixing Sparse ENDIAN CHECK warning
...
