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As stated in the coding style documentation, "if there is no cleanup
needed then just return directly", instead of jumping to a label and
then returning.
Remove such goto's and replace with a return statement. When there's a
ternary operator on the return value, replace it with the result of the
operation when it is logically possible to determine it by the control
flow.
Signed-off-by: André Almeida <andrealmeid@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200702202843.520764-3-andrealmeid@collabora.com
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.
Deterministic algorithm:
For each file:
If not .svg:
For each line:
If doesn't contain `\bxmlns\b`:
For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
If both the HTTP and HTTPS versions
return 200 OK and serve the same content:
Replace HTTP with HTTPS.
Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200713115728.33905-1-grandmaster@al2klimov.de
Currently lockdep_types.h includes list.h without actually using any
of its macros or functions. All it needs are the type definitions
which were moved into types.h long ago. This potentially causes
inclusion loops because both are included by many core header
files.
This patch moves the list.h inclusion into lockdep.h. Note that
we could probably remove it completely but that could potentially
result in compile failures should any end users not include list.h
directly and also be unlucky enough to not get list.h via some other
header file.
Reported-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lkml.kernel.org/r/20200716063649.GA23065@gondor.apana.org.au
Currently all IRQ-tracking state is in task_struct, this means that
task_struct needs to be defined before we use it.
Especially for lockdep_assert_irq*() this can lead to header-hell.
Move the hardirq state into per-cpu variables to avoid the task_struct
dependency.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200623083721.512673481@infradead.org
While the nmi_enter() users did
trace_hardirqs_{off_prepare,on_finish}() there was no matching
lockdep_hardirqs_*() calls to complete the picture.
Introduce idtentry_{enter,exit}_nmi() to enable proper IRQ state
tracking across the NMIs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200623083721.216740948@infradead.org
The new IRQ state tracking code does not honor lockdep_off(), and as
such we should again permit tracing by using non-raw functions in
core.c. Update the lockdep_off() comment in report.c, to reflect the
fact there is still a potential risk of deadlock due to using printk()
from scheduler code.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200624113246.GA170324@elver.google.com
Using a mutex for "print this warning only once" is so overdesigned as
to be actively offensive to my sensitive stomach.
Just use "pr_info_once()" that already does this, although in a
(harmlessly) racy manner that can in theory cause the message to be
printed twice if more than one CPU races on that "is this the first
time" test.
[ If somebody really cares about that harmless data race (which sounds
very unlikely indeed), that person can trivially fix printk_once() by
using a simple atomic access, preferably with an optimistic non-atomic
test first before even bothering to treat the pointless "make sure it
is _really_ just once" case.
A mutex is most definitely never the right primitive to use for
something like this. ]
Yes, this is a small and meaningless detail in a code path that hardly
matters. But let's keep some code quality standards here, and not
accept outrageously bad code.
Link: https://lore.kernel.org/lkml/CAHk-=wgV9toS7GU3KmNpj8hCS9SeF+A0voHS8F275_mgLhL4Lw@mail.gmail.com/
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull x86 fixes from Thomas Gleixner:
"A series of fixes for x86:
- Reset MXCSR in kernel_fpu_begin() to prevent using a stale user
space value.
- Prevent writing MSR_TEST_CTRL on CPUs which are not explicitly
whitelisted for split lock detection. Some CPUs which do not
support it crash even when the MSR is written to 0 which is the
default value.
- Fix the XEN PV fallout of the entry code rework
- Fix the 32bit fallout of the entry code rework
- Add more selftests to ensure that these entry problems don't come
back.
- Disable 16 bit segments on XEN PV. It's not supported because XEN
PV does not implement ESPFIX64"
* tag 'x86-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/ldt: Disable 16-bit segments on Xen PV
x86/entry/32: Fix #MC and #DB wiring on x86_32
x86/entry/xen: Route #DB correctly on Xen PV
x86/entry, selftests: Further improve user entry sanity checks
x86/entry/compat: Clear RAX high bits on Xen PV SYSENTER
selftests/x86: Consolidate and fix get/set_eflags() helpers
selftests/x86/syscall_nt: Clear weird flags after each test
selftests/x86/syscall_nt: Add more flag combinations
x86/entry/64/compat: Fix Xen PV SYSENTER frame setup
x86/entry: Move SYSENTER's regs->sp and regs->flags fixups into C
x86/entry: Assert that syscalls are on the right stack
x86/split_lock: Don't write MSR_TEST_CTRL on CPUs that aren't whitelisted
x86/fpu: Reset MXCSR to default in kernel_fpu_begin()
Pull irq fixes from Thomas Gleixner:
"A set of interrupt chip driver fixes:
- Ensure the atomicity of affinity updates in the GIC driver
- Don't try to sleep in atomic context when waiting for the GICv4.1
to respond. Use polling instead.
- Typo fixes in Kconfig and warnings"
* tag 'irq-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/gic: Atomically update affinity
irqchip/riscv-intc: Fix a typo in a pr_warn()
irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic
irqchip/loongson-pci-msi: Fix a typo in Kconfig
Pull rcu fixlet from Thomas Gleixner:
"A single fix for a printk format warning in RCU"
* tag 'core-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rcuperf: Fix printk format warning
Pull Kbuild fixes frin Masahiro Yamada:
- fix various bugs in xconfig
- fix some issues in cross-compilation using Clang
- fix documentation
* tag 'kbuild-fixes-v5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
.gitignore: Do not track `defconfig` from `make savedefconfig`
kbuild: make Clang build userprogs for target architecture
kbuild: fix CONFIG_CC_CAN_LINK(_STATIC) for cross-compilation with Clang
kconfig: qconf: parse newer types at debug info
kconfig: qconf: navigate menus on hyperlinks
kconfig: qconf: don't show goback button on splitMode
kconfig: qconf: simplify the goBack() logic
kconfig: qconf: re-implement setSelected()
kconfig: qconf: make debug links work again
kconfig: qconf: make search fully work again on split mode
kconfig: qconf: cleanup includes
docs: kbuild: fix ReST formatting
gcc-plugins: fix gcc-plugins directory path in documentation
Pull SCSI fixes from James Bottomley:
"Four small fixes in three drivers.
The mptfusion one has actually caused user visible issues in certain
kernel configurations"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: mptfusion: Don't use GFP_ATOMIC for larger DMA allocations
scsi: libfc: Skip additional kref updating work event
scsi: libfc: Handling of extra kref
scsi: qla2xxx: Fix a condition in qla2x00_find_all_fabric_devs()
Pull block fixes from Jens Axboe:
- NVMe fixes from Christoph:
- Fix crash in multi-path disk add (Christoph)
- Fix ignore of identify error (Sagi)
- Fix a compiler complaint that a function should be static (Wei)
* tag 'block-5.8-2020-07-05' of git://git.kernel.dk/linux-block:
block: make function __bio_integrity_free() static
nvme: fix a crash in nvme_mpath_add_disk
nvme: fix identify error status silent ignore
Pull io_uring fix from Jens Axboe:
"Andres reported a regression with the fix that was merged earlier this
week, where his setup of using signals to interrupt io_uring CQ waits
no longer worked correctly.
Fix this, and also limit our use of TWA_SIGNAL to the case where we
need it, and continue using TWA_RESUME for task_work as before.
Since the original is marked for 5.7 stable, let's flush this one out
early"
* tag 'io_uring-5.8-2020-07-05' of git://git.kernel.dk/linux-block:
io_uring: fix regression with always ignoring signals in io_cqring_wait()
Pull i2c fixes from Wolfram Sang:
"The usual driver fixes and documentation updates"
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: mlxcpld: check correct size of maximum RECV_LEN packet
i2c: add Kconfig help text for slave mode
i2c: slave-eeprom: update documentation
i2c: eg20t: Load module automatically if ID matches
i2c: designware: platdrv: Set class based on DMI
i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665
Pull MIPS fixes from Thomas Bogendoerfer:
- fix for missing hazard barrier
- DT fix for ingenic
- DT fix of GPHY names for lantiq
- fix usage of smp_processor_id() while preemption is enabled
* tag 'mips_fixes_5.8_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: Do not use smp_processor_id() in preemptible code
MIPS: Add missing EHB in mtc0 -> mfc0 sequence for DSPen
MIPS: ingenic: gcw0: Fix HP detection GPIO.
MIPS: lantiq: xway: sysctrl: fix the GPHY clock alias names
This resolves the hazard between the mtc0 in the change_c0_status() and
the mfc0 in configure_exception_vector(). Without resolving this hazard
configure_exception_vector() could read an old value and would restore
this old value again. This would revert the changes change_c0_status()
did. I checked this by printing out the read_c0_status() at the end of
per_cpu_trap_init() and the ST0_MX is not set without this patch.
The hazard is documented in the MIPS Architecture Reference Manual Vol.
III: MIPS32/microMIPS32 Privileged Resource Architecture (MD00088), rev
6.03 table 8.1 which includes:
Producer | Consumer | Hazard
----------|----------|----------------------------
mtc0 | mfc0 | any coprocessor 0 register
I saw this hazard on an Atheros AR9344 rev 2 SoC with a MIPS 74Kc CPU.
There the change_c0_status() function would activate the DSPen by
setting ST0_MX in the c0_status register. This was reverted and then the
system got a DSP exception when the DSP registers were saved in
save_dsp() in the first process switch. The crash looks like this:
[ 0.089999] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.097796] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.107070] Kernel panic - not syncing: Unexpected DSP exception
[ 0.113470] Rebooting in 1 seconds..
We saw this problem in OpenWrt only on the MIPS 74Kc based Atheros SoCs,
not on the 24Kc based SoCs. We only saw it with kernel 5.4 not with
kernel 4.19, in addition we had to use GCC 8.4 or 9.X, with GCC 8.3 it
did not happen.
In the kernel I bisected this problem to commit 9012d01166 ("compiler:
allow all arches to enable CONFIG_OPTIMIZE_INLINING"), but when this was
reverted it also happened after commit 172dcd935c ("MIPS: Always
allocate exception vector for MIPSr2+").
Commit 0b24cae4d5 ("MIPS: Add missing EHB in mtc0 -> mfc0 sequence.")
does similar changes to a different file. I am not sure if there are
more places affected by this problem.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Running `make savedefconfig` creates by default `defconfig`, which is,
currently, on git’s radar, for example, `git status` lists this file as
untracked.
So, add the file to `.gitignore`, so it’s ignored by git.
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Pull powerpc fixes from Michael Ellerman:
"One fix for a regression in our pkey handling, which exhibits as
PROT_EXEC mappings taking continuous page faults.
Thanks to: Jan Stancek, Aneesh Kumar K.V"
* tag 'powerpc-5.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/mm/pkeys: Make pkey access check work on execute_only_key
Pull arm64 fixes from Will Deacon:
"Nothing earth-shattering, really - some CPU errata workarounds (one
day they'll get it right, ha!) and a fix for a boot failure with very
large kernel images where the alternative patching gets confused when
patching relative branches using veneers.
- Fix alternative patching for very large kernel images and modules
- Hook up existing CPU errata workarounds for Qualcomm Kryo CPUs"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: Add KRYO4XX silver CPU cores to erratum list 1530923 and 1024718
arm64: Add KRYO4XX gold CPU cores to erratum list 1463225 and 1418040
arm64: Add MIDR value for KRYO4XX gold CPU cores
arm64/alternatives: use subsections for replacement sequences
When switching to TWA_SIGNAL for task_work notifications, we also made
any signal based condition in io_cqring_wait() return -ERESTARTSYS.
This breaks applications that rely on using signals to abort someone
waiting for events.
Check if we have a signal pending because of queued task_work, and
repeat the signal check once we've run the task_work. This provides a
reliable way of telling the two apart.
Additionally, only use TWA_SIGNAL if we are using an eventfd. If not,
we don't have the dependency situation described in the original commit,
and we can get by with just using TWA_RESUME like we previously did.
Fixes: ce593a6c48 ("io_uring: use signal based task_work running")
Cc: stable@vger.kernel.org # v5.7
Reported-by: Andres Freund <andres@anarazel.de>
Tested-by: Andres Freund <andres@anarazel.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
On Xen PV, #DB doesn't use IST. It still needs to be correctly routed
depending on whether it came from user or kernel mode.
Get rid of DECLARE/DEFINE_IDTENTRY_XEN -- it was too hard to follow the
logic. Instead, route #DB and NMI through DECLARE/DEFINE_IDTENTRY_RAW on
Xen, and do the right thing for #DB. Also add more warnings to the
exc_debug* handlers to make this type of failure more obvious.
This fixes various forms of corruption that happen when usermode
triggers #DB on Xen PV.
Fixes: 4c0dcd8350 ("x86/entry: Implement user mode C entry points for #DB and #MCE")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/4163e733cce0b41658e252c6c6b3464f33fdff17.1593795633.git.luto@kernel.org
Pull xen fixes from Juergen Gross:
"One small cleanup patch for ARM and two patches for the xenbus driver
fixing latent problems (large stack allocations and bad return code
settings)"
* tag 'for-linus-5.8b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/xenbus: let xenbus_map_ring_valloc() return errno values only
xen/xenbus: avoid large structs and arrays on the stack
arm/xen: remove the unused macro GRANT_TABLE_PHYSADDR
I2C_SMBUS_BLOCK_MAX defines already the maximum number as defined in the
SMBus 2.0 specs. I don't see a reason to add 1 here. Also, fix the errno
to what is suggested for this error.
Fixes: c9bfdc7c16 ("i2c: mlxcpld: Add support for smbus block read transaction")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Michael Shych <michaelsh@mellanox.com>
Tested-by: Michael Shych <michaelsh@mellanox.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Pull sysctl fix from Al Viro:
"Another regression fix for sysctl changes this cycle..."
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
Call sysctl_head_finish on error
The driver can't be loaded automatically because it misses
module alias to be provided. Add corresponding MODULE_DEVICE_TABLE()
call to the driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Current AMD's zen-based APUs use this core for some of its i2c-buses.
With this patch we re-enable autodetection of hwmon-alike devices, so
lm-sensors will be able to work automatically.
It does not affect the boot-time of embedded devices, as the class is
set based on the DMI information.
DMI is probed only on Qtechnology QT5222 Industrial Camera Platform.
DocLink: https://qtec.com/camera-technology-camera-platforms/
Fixes: 3eddad96c4 ("i2c: designware: reverts "i2c: designware: Add support for AMD I2C controller"")
Signed-off-by: Ricardo Ribalda <ribalda@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
low, this differs to the PCA9564 which uses 90h for this indication.
Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.
Based on looking through the PCA9564 and PCA9665 datasheets this should
be safe for both chips. The PCA9564 should not return 0x78 for any valid
state and the PCA9665 should not return 0x90.
Fixes: eff9ec95ef ("i2c-algo-pca: Add PCA9665 support")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Pull cifs fixes from Steve French:
"Eight cifs/smb3 fixes, most when specifying the multiuser mount flag.
Five of the fixes are for stable"
* tag '5.8-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: prevent truncation from long to int in wait_for_free_credits
cifs: Fix the target file was deleted when rename failed.
SMB3: Honor 'posix' flag for multiuser mounts
SMB3: Honor 'handletimeout' flag for multiuser mounts
SMB3: Honor lease disabling for multiuser mounts
SMB3: Honor persistent/resilient handle flags for multiuser mounts
SMB3: Honor 'seal' flag for multiuser mounts
cifs: Display local UID details for SMB sessions in DebugData
Pull hwmon fixes from Guenter Roeck:
- Fix typo in Kconfig SENSORS_IR35221 option
- Fix potential memory leak in acpi_power_meter_add()
- Make sure the OVERT mask is set correctly in max6697 driver
- In PMBus core, fix page vs. register when accessing fans
- Mark is_visible functions static in bt1-pvt driver
- Define Temp- and Volt-to-N poly as maybe-unused in bt1-pvt driver
* tag 'hwmon-for-v5.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (pmbus) fix a typo in Kconfig SENSORS_IR35221 option
hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add()
hwmon: (max6697) Make sure the OVERT mask is set correctly
hwmon: (pmbus) Fix page vs. register when accessing fans
hwmon: (bt1-pvt) Mark is_visible functions static
hwmon: (bt1-pvt) Define Temp- and Volt-to-N poly as maybe-unused
Merge misc fixes from Andrew Morton:
"Subsystems affected by this patch series: mm/hugetlb, samples, mm/cma,
mm/vmalloc, mm/pagealloc"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm/page_alloc: fix documentation error
vmalloc: fix the owner argument for the new __vmalloc_node_range callers
mm/cma.c: use exact_nid true to fix possible per-numa cma leak
samples/vfs: avoid warning in statx override
mm/hugetlb.c: fix pages per hugetlb calculation
