The updates this time around are almost all driver code:
- Further slow progress on the topology code.
- Substantial updates and improvements for the da7219, es8328, fsl-ssi
Intel and rcar drivers.
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Merge tag 'asoc-v4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: Updates for v4.7
The updates this time around are almost all driver code:
- Further slow progress on the topology code.
- Substantial updates and improvements for the da7219, es8328, fsl-ssi
Intel and rcar drivers.
* pm-devfreq:
PM / devfreq: style/typo fixes
PM / devfreq: exynos: Add the detailed correlation for Exynos5422 bus
PM / devfreq: event: Find the instance of devfreq-event device by using phandle
PM / devfreq: event: Add new Exynos NoC probe driver
MAINTAINERS: Add samsung bus frequency driver entry
PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver
PM / devfreq: exynos: Add the detailed correlation between sub-blocks and power line
PM / devfreq: exynos: Update documentation for bus devices using passive governor
PM / devfreq: exynos: Add support of bus frequency of sub-blocks using passive governor
PM / devfreq: Add new passive governor
PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier
PM / devfreq: Add devfreq_get_devfreq_by_phandle()
PM / devfreq: exynos: Add documentation for generic exynos bus frequency driver
PM / devfreq: exynos: Add generic exynos bus frequency driver
* pm-cpuidle:
cpuidle: Replace ktime_get() with local_clock()
drivers: firmware: psci: use const and __initconst for psci_cpuidle_ops
soc: qcom: spm: Use const and __initconst for qcom_cpuidle_ops
ARM: cpuidle: constify return value of arm_cpuidle_get_ops()
ARM: cpuidle: add const qualifier to cpuidle_ops member in structures
intel_idle: add BXT support
cpuidle: Indicate when a device has been unregistered
* pm-cpufreq: (63 commits)
intel_pstate: Clean up get_target_pstate_use_performance()
intel_pstate: Use sample.core_avg_perf in get_avg_pstate()
intel_pstate: Clarify average performance computation
intel_pstate: Avoid unnecessary synchronize_sched() during initialization
cpufreq: schedutil: Make default depend on CONFIG_SMP
cpufreq: powernv: del_timer_sync when global and local pstate are equal
cpufreq: powernv: Move smp_call_function_any() out of irq safe block
intel_pstate: Clean up intel_pstate_get()
cpufreq: schedutil: Make it depend on CONFIG_SMP
cpufreq: governor: Fix handling of special cases in dbs_update()
cpufreq: intel_pstate: Ignore _PPC processing under HWP
cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table
cpufreq: tango: Use generic platdev driver
cpufreq: Fix GOV_LIMITS handling for the userspace governor
cpufreq: mvebu: Move cpufreq code into drivers/cpufreq/
cpufreq: dt: Kill platform-data
mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared
cpufreq: dt: Identify cpu-sharing for platforms without operating-points-v2
cpufreq: governor: Change confusing struct field and variable names
cpufreq: intel_pstate: Enable PPC enforcement for servers
...
* pm-opp:
PM / OPP: Move CONFIG_OF dependent code in a separate file
PM / OPP: add non-OF versions of dev_pm_opp_{cpumask_, }remove_table
PM / OPP: pass cpumask by reference
PM / OPP: Add dev_pm_opp_get_sharing_cpus()
PM / OPP: Mark cpumask as const in dev_pm_opp_set_sharing_cpus()
PM / OPP: -ENOSYS is applicable only to syscalls
PM / OPP: Mark shared-opp for non-dt case
PM / OPP: Relocate dev_pm_opp_set_sharing_cpus()
PM / OPP: dev_pm_opp_set_sharing_cpus() doesn't depend on CONFIG_OF
PM / OPP: Add missing doc style comments
PM / OPP: Propagate the error returned by _find_opp_table()
When reverting an update property changeset entry that created a
property the reverse operation is a remove property and not an update.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This returns the allocate memory chunk, storing the unflattened device
tree, from of_fdt_unflatten_tree() so that memory chunk can be released
on demand in PowerNV PCI hotplug driver.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This adds one more argument to of_fdt_unflatten_tree() to specify
the parent node of the FDT blob that is going to be unflattened.
In the result, the function can be used to unflatten FDT blob that
represents device sub-tree in PowerNV PCI hotplug driver.
Cc: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This renames unflatten_dt_node() to unflatten_dt_nodes() as it
populates multiple device nodes from FDT blob. No logical changes
introduced.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
In current implementation, unflatten_dt_node() is called recursively
to unflatten device nodes in FDT blob. It's stress to limited stack
capacity, especially to adopt the function to unflatten device sub-tree
that possibly has multiple root nodes. In that case, we runs out of
stack and the system can't boot up successfully.
In order to reuse the function to unflatten device sub-tree, this avoids
calling the function recursively, meaning the device nodes are unflattened
in one call on unflatten_dt_node(): two arrays are introduced to track the
parent path size and the device node of current level of depth, which will
be used by the device node on next level of depth to be unflattened. All
device nodes in more than 64 level of depth are dropped and hopefully,
the system can boot up successfully with the partial device-tree.
Also, the parameter "poffset" and "fpsize" are unused and dropped and the
parameter "dryrun" is figured out from "mem == NULL". Besides, the return
value of the function is changed to indicate the size of memory consumed by
the unflatten device tree or error code.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
The function unflatten_dt_node() is called recursively to unflatten
device nodes and properties in the FDT blob. It looks complicated
and hard to be understood.
This splits the function into 3 functions: populate_properties(),
populate_node() and unflatten_dt_node(). populate_properties(),
which is called by populate_node(), creates properties for the
indicated device node. The later one creates the device nodes
from FDT blob. populate_node() gets the offset in FDT blob for
next device nodes and then calls populate_node(). No logical
changes introduced.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Some eMMCs set the partition switch timeout too low.
Now typically eMMCs are considered a critical component (e.g. because
they store the root file system) and consequently are expected to be
reliable. Thus we can neglect the use case where eMMCs can't switch
reliably and we might want a lower timeout to facilitate speedy
recovery.
Although we could employ a quirk for the cards that are affected (if
we could identify them all), as described above, there is little
benefit to having a low timeout, so instead simply set a minimum
timeout.
The minimum is set to 300ms somewhat arbitrarily - the examples that
have been seen had a timeout of 10ms but were sometimes taking 60-70ms.
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested on a Salvator-X board with a Spectec SDW-823 WLAN card.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
I have two SDIO WLAN cards which specify being SDIO Rev. 1.1 cards but
their FUNCE tuple reports the smaller size of a Rev 1.0 card. So,
enforce 1.0 on these cards to avoid reading the not present registers.
They are not really used anyhow. My cards initialize properly after this
patch.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Correct what appears to be a typo in the name of the sd-uhs-sdr50.
Also fix mixed tab/space indentation.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
I have some more additions planned for this driver, so I'd like to get
notified of other changes and coordinate them. Drop Ian as maintainer
because he hasn't been involved in development for a while. Thanks for
all the initial work, of course! Also, reflect the recent changes to
the include file layout.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: Ian Molton <ian@mnementh.co.uk>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Add some logging to make it clear just how the emmc timeout
was handled.
Signed-off-by: Ken Sumrall <ksumrall@android.com>
[AmitP: cherry-picked this Android patch from aosp
common kernel android-4.4]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
After commit d6463f170cf0 ("mmc: sdhci: Remove redundant runtime PM calls"),
some of original sdhci_do_xx() function wrappers becomes meaningless,
so remove them.
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
A 'struct bio' is allocated in scrub_missing_raid56_pages(), but it was never
freed anywhere.
Signed-off-by: Scott Talbert <scott.talbert@hgst.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Issue:
As a master, the PCI IP block can combine a memory write to the last PCI
double word (4 bytes) of a cacheline with a 4 byte memory write to the
first PCI double word of the subsequent cacheline. This affects 32-bit
PCI target devices that blindly assert STOP on memory-write transactions,
without detecting that the data beat being transferred is the last data
beat of the transaction. It can cause a hang. PCI-X operation is not
affected by this erratum.
Workaround:
Setting the bit MDS in the PCI Bus Function Register will disable the
combining of crossing cacheline boundary requests into one burst
transaction. Therefore, it can prevent the errata scenario from
occurring.
This errata exists in MPC8543, MPC8543E, MPC8545, MPC8545E, MPC8547,
MPC8547E, MPC8548 and MPC8548E. Refer to PCI 5 in MPC8548 errata
document.
Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Zhiqiang Hou <Zhiqiang.Hou@freescale.com>
[scottwood: whitespace fix]
Signed-off-by: Scott Wood <oss@buserror.net>
On the t208xrdb and t1040rdb, the SPI device is n25q512ax3
instead of n25q512a.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
Signed-off-by: Scott Wood <oss@buserror.net>
The new signal_pending exit path in __rwsem_down_write_failed_common()
was fingered as breaking his kernel by Tetsuo Handa.
Upon inspection it was found that there are two things wrong with it;
- it forgets to remove WAITING_BIAS if it leaves the list empty, or
- it forgets to wake further waiters that were blocked on the now
removed waiter.
Especially the first issue causes new lock attempts to block and stall
indefinitely, as the code assumes that pending waiters mean there is
an owner that will wake when it releases the lock.
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Tested-by: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Waiman Long <Waiman.Long@hpe.com>
Link: http://lkml.kernel.org/r/20160512115745.GP3192@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Jeff Kirsher says:
====================
40GbE Intel Wired LAN Driver Updates 2016-05-14
This series contains updates to i40e and i40evf.
Kevin adds support to disable link on all ports and changes bits set
for telling firmware the PHY needs to be modified by the driver.
Anjali adds a feature to enable/disable all multicast for a trusted
VF. Added priv-flag knob to configure global true promiscuous
support.
Shannon adds the support code for calling the admin queue API call
aq_set_switch_config().
Mitch modifies the VF, to log a message if an untrusted VF attempts to
configure promiscuous mode, but lies to it and returns everything is ok
instead of returning an error. Corrects the logic for reporting the
receive packet hash. Fixed the adding of a broadcast filter for VFs,
since that all VSIs are configured to receive broadcasts as default,
so do not need to add a filter.
Catherine refactors the ethtool get_settings to report the possible
supported link modes from what we know about the current PHY type and
that with the firmware supported PHY types.
Jacob changes the driver to use WARN_ONCE in order to highlight the
issue, but do not display a warning every time when receive hang
message is received.
Akeem corrects receive ptype payload layer for non_tunneled IPv6, when
it should be layer 4 for UDP, instead of layer 3.
Dan Carpenter fixes an uninitialized variable bug.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Michael Chan says:
====================
bnxt_en: updates for net-next.
Non-critical bug fixes, improvements, a new ethtool feature, and a new
device ID.
v2: Fixed a bug in bnxt_get_module_eeprom() found by Ben Hutchings.
Ajit Khaparde (2):
bnxt_en: Add Support for ETHTOOL_GMODULEINFO and ETHTOOL_GMODULEEEPRO
bnxt_en: Report PCIe link speed and width during driver load
Michael Chan (6):
bnxt_en: Reduce maximum ring pages if page size is 64K.
bnxt_en: Improve the delay logic for firmware response.
bnxt_en: Fix length value in dmesg log firmware error message.
bnxt_en: Simplify and improve unsupported SFP+ module reporting.
bnxt_en: Add BCM57314 device ID.
bnxt_en: Use dma_rmb() instead of rmb().
Satish Baddipadige (1):
bnxt_en: Fix invalid max channel parameter in ethtool -l.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Use the weaker but more appropriate dma_rmb() to order the reading of
the completion ring.
Suggested-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The current code is more complicated than necessary and can only report
unsupported SFP+ module if it is plugged in after the device is up.
Rename bnxt_port_module_event() to bnxt_get_port_module_status(). We
already have the current module_status in the link_info structure, so
just check that and report any unsupported SFP+ module status. Delete
the unnecessary last_port_module_event. Call this function at the
end of bnxt_open to report unsupported module already plugged in.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The len value in the hwrm error message is wrong. Use the properly adjusted
value in the variable len.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The current code has 2 problems:
1. The maximum wait time is not long enough. It is about 60% of the
duration specified by the firmware. It is calling usleep_range(600, 800)
for every 1 msec we are supposed to wait.
2. The granularity of the delay is too coarse. Many simple firmware
commands finish in 25 usec or less.
We fix these 2 issues by multiplying the original 1 msec loop counter by
40 and calling usleep_range(25, 40) for each iteration.
There is also a second delay loop to wait for the last DMA word to
complete. This delay loop should be a very short 5 usec wait.
This change results in much faster bring-up/down time:
Before the patch:
time ip link set p4p1 up
real 0m0.120s
user 0m0.001s
sys 0m0.009s
After the patch:
time ip link set p4p1 up
real 0m0.030s
user 0m0.000s
sys 0m0.010s
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The chip supports 4K/8K/64K page sizes for the rings and we try to
match it to the CPU PAGE_SIZE. The current page size limits for the rings
are based on 4K/8K page size. If the page size is 64K, these limits are
too large. Reduce them appropriately.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add code to log a message during driver load indicating PCIe link
speed and width.
The log message will look like this:
bnxt_en 0000:86:00.0 eth0: PCIe: Speed 8.0GT/s Width x8
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support to fetch the SFP EEPROM settings from the firmware
and display it via the ethtool -m command. We support SFP+ and QSFP
modules.
v2: Fixed a bug in bnxt_get_module_eeprom() found by Ben Hutchings.
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When there is only 1 MSI-X vector or in INTA mode, tx and rx pre-set
max channel parameters are shown incorrectly in ethtool -l. With only 1
vector, bnxt_get_max_rings() will return -ENOMEM. bnxt_get_channels
should check this return value, and set max_rx/max_tx to 0 if it is
non-zero.
Signed-off-by: Satish Baddipadige <sbaddipa@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The nf_conntrack_core.c fix in 'net' is not relevant in 'net-next'
because we no longer have a per-netns conntrack hash.
The ip_gre.c conflict as well as the iwlwifi ones were cases of
overlapping changes.
Conflicts:
drivers/net/wireless/intel/iwlwifi/mvm/tx.c
net/ipv4/ip_gre.c
net/netfilter/nf_conntrack_core.c
Signed-off-by: David S. Miller <davem@davemloft.net>
Pull x86 fix from Thomas Gleixner:
"Just the missing compat entry for the new pread/writev2"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Use compat version for preadv2 and pwritev2
Make it possible to transfer i2c message buffers via DMA.
Start/Stop/Sending_Slave_Address and some data is still handled using
the old state machine, it is sending the bulk of the data that is done
via DMA.
The first byte of a transmission and the last two bytes of reception are
sent/received using PIO. This is needed for the HW to have access to the
first byte before DMA transmit and to be able to set the STOP condition
for DMA reception.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
[wsa: fixed a checkpatch warning]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Switchdev has been around for quite a while now, putting "EXPERIMENTAL"
in the description is no longer accurate, drop it.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Original implementation commit e54bcde3d6 ("arm64: eBPF JIT compiler")
had the relevant code paths, but due to an oversight always fail jiting.
As a result, we had been falling back to BPF interpreter whenever a BPF
program has JMP_JSET_{X,K} instructions.
With this fix, we confirm that the corresponding tests in lib/test_bpf
continue to pass, and also jited.
...
[ 2.784553] test_bpf: #30 JSET jited:1 188 192 197 PASS
[ 2.791373] test_bpf: #31 tcpdump port 22 jited:1 325 677 625 PASS
[ 2.808800] test_bpf: #32 tcpdump complex jited:1 323 731 991 PASS
...
[ 3.190759] test_bpf: #237 JMP_JSET_K: if (0x3 & 0x2) return 1 jited:1 110 PASS
[ 3.192524] test_bpf: #238 JMP_JSET_K: if (0x3 & 0xffffffff) return 1 jited:1 98 PASS
[ 3.211014] test_bpf: #249 JMP_JSET_X: if (0x3 & 0x2) return 1 jited:1 120 PASS
[ 3.212973] test_bpf: #250 JMP_JSET_X: if (0x3 & 0xffffffff) return 1 jited:1 89 PASS
...
Fixes: e54bcde3d6 ("arm64: eBPF JIT compiler")
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Currently, when creating or updating a route, no check is performed
in both ipv4 and ipv6 code to the hoplimit value.
The caller can i.e. set hoplimit to 256, and when such route will
be used, packets will be sent with hoplimit/ttl equal to 0.
This commit adds checks for the RTAX_HOPLIMIT value, in both ipv4
ipv6 route code, substituting any value greater than 255 with 255.
This is consistent with what is currently done for ADVMSS and MTU
in the ipv4 code.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The slab name ends up being visible in the directory structure under
/sys, and even if you don't have access rights to the file you can see
the filenames.
Just use a 64-bit counter instead of the pointer to the 'net' structure
to generate a unique name.
This code will go away in 4.7 when the conntrack code moves to a single
kmemcache, but this is the backportable simple solution to avoiding
leaking kernel pointers to user space.
Fixes: 5b3501faa8 ("netfilter: nf_conntrack: per netns nf_conntrack_cachep")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Pull vfs fixes from Al Viro:
"Overlayfs fixes from Miklos, assorted fixes from me.
Stable fodder of varying severity, all sat in -next for a while"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ovl: ignore permissions on underlying lookup
vfs: add lookup_hash() helper
vfs: rename: check backing inode being equal
vfs: add vfs_select_inode() helper
get_rock_ridge_filename(): handle malformed NM entries
ecryptfs: fix handling of directory opening
atomic_open(): fix the handling of create_error
fix the copy vs. map logics in blk_rq_map_user_iov()
do_splice_to(): cap the size before passing to ->splice_read()
Patch series from Jani Nikula:
> Jon, I was hoping we could consider nudging things forward a bit in the
> kernel-doc and docproc reStructuredText front already in 4.7. I know
> it's a bit close to the merge window, but this should not interfere with
> anything else, and some of it are just trivial cleanups that I've been
> carrying around locally.
>
> Obviously this doesn't actually add anything that uses them yet, but I
> think it would be helpful to have some common base in to ease
> collaboration.
