In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.
So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.
This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.
Add this missing pair of calls in the Frv's idle loop.
Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org> # 3.3+
Acked-by: David Howells <dhowells@redhat.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.
So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.
This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.
Add this missing pair of calls in the Cris's idle loop.
Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Cris <linux-cris-kernel@axis.com>
Cc: <stable@vger.kernel.org> # 3.3+
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.
So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.
This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.
Add this missing pair of calls in the Alpha's idle loop.
Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: alpha <linux-alpha@vger.kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org> # 3.3+
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
cpu_idle() is called on the boot CPU by the init code with
preemption disabled. But the cpu_idle() function in alpha
doesn't handle this when it calls schedule() directly.
Fix it by converting it into schedule_preempt_disabled().
Also disable preemption before calling cpu_idle() from
secondary CPU entry code to stay consistent with this
state.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: alpha <linux-alpha@vger.kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
If arch/x86/kernel/cpuid.c is a module, a CPU might offline or online
between the for_each_online_cpu() loop and the call to
register_hotcpu_notifier in cpuid_init or the call to
unregister_hotcpu_notifier in cpuid_exit. The potential races can
lead to leaks/duplicates, attempts to destroy non-existant devices, or
random pointer dereferences.
For example, in cpuid_exit if:
for_each_online_cpu(cpu)
cpuid_device_destroy(cpu);
class_destroy(cpuid_class);
__unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid");
<----- CPU onlines
unregister_hotcpu_notifier(&cpuid_class_cpu_notifier);
the hotcpu notifier will attempt to create a device for the
cpuid_class, which the module already destroyed.
This fix surrounds for_each_online_cpu and register_hotcpu_notifier or
unregister_hotcpu_notifier with get_online_cpus+put_online_cpus.
Tested on a VM.
Signed-off-by: Silas Boyd-Wickizer <sbw@mit.edu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
If arch/x86/kernel/msr.c is a module, a CPU might offline or online
between the for_each_online_cpu(i) loop and the call to
register_hotcpu_notifier in msr_init or the call to
unregister_hotcpu_notifier in msr_exit. The potential races can lead
to leaks/duplicates, attempts to destroy non-existant devices, or
random pointer dereferences.
For example, in msr_init if:
for_each_online_cpu(i) {
err = msr_device_create(i);
if (err != 0)
goto out_class;
}
<----- CPU offlines
register_hotcpu_notifier(&msr_class_cpu_notifier);
and the CPU never onlines before msr_exit, then the module will never
call msr_device_destroy for the associated CPU.
This fix surrounds for_each_online_cpu and register_hotcpu_notifier or
unregister_hotcpu_notifier with get_online_cpus+put_online_cpus.
Tested on a VM.
Signed-off-by: Silas Boyd-Wickizer <sbw@mit.edu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* 'for-arm-soc-next' of git://git.linaro.org/people/ljones/linux-3.0-ux500:
ARM: ux500: Fix SSP register address format
ARM: ux500: Apply tc3589x's GPIO/IRQ properties to HREF's DT
ARM: ux500: Remove redundant #gpio-cell properties from Snowball DT
ARM: ux500: Add all encompassing sound node to the HREF Device Tree
ARM: ux500: Add nodes for the MSP into the HREF Device Tree
ARM: ux500: Add all known I2C sub-device nodes to the HREF DT
ARM: ux500: Stop registering I2C sub-devices for HREF when DT is enabled
ARM: ux500: Stop registering Audio devices for HREF when DT is enabled
ARM: ux500: Add all encompassing sound node to the Snowball Device Tree
ARM: ux500: Add nodes for the MSP into Device Tree
ARM: ux500: Rename MSP board file to something more meaningful
ARM: ux500: Remove platform registration of MSP devices
ARM: ux500: Stop registering the MOP500 Audio driver from platform code
ARM: ux500: Pass MSP DMA platform data though AUXDATA
ARM: ux500: Fork MSP platform registration for step-by-step DT enablement
ARM: ux500: Add AB8500 CODEC node to DB8500 Device Tree
ARM: ux500: Clean-up MSP platform code
ARM: ux500: Pass SDI DMA information though AUX_DATA to MMCI
ARM: ux500: Add UART support to the HREF Device Tree
ARM: ux500: Add skeleton Device Tree for the HREF reference board
...
+ sync to v3.6-rc6
Pull MIPS fixes from Ralf Baechle:
"Random fixes across arch/mips, essentially.
One fix for an issue in get_user_pages_fast() which previously was
discovered on x86, a miscalculation in the support for the MIPS MT
hardware multithreading support, the RTC support for the Malta and a
fix for a spurious interrupt issue that seems to bite only very
special Malta configurations."
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: Malta: Don't crash on spurious interrupt.
MIPS: Malta: Remove RTC Data Mode bootstrap breakage
MIPS: mm: Add compound tail page _mapcount when mapped
MIPS: CMP/SMTC: Fix tc_id calculation
Pull ARM and clkdev fixes from Russell King:
"Two patches for clkdev which resolve the long standing issue that the
devm_* versions were dependent on clkdev, which they shouldn't have
been. Instead, they're dependent on HAVE_CLK instead, which implies
that you're providing clk_get() and clk_put().
A small fix to the ARM decompressor to ensure that the page tables are
properly interpreted by the CPU, and reserve syscall 378 for kcmp (the
checksyscalls.sh script is unfortunately currently broken so arch
maintainers aren't getting notified of new syscalls...)
Lastly, a larger fix for an issue between the common clk subsystem and
smp_twd which causes warnings to be spat out."
* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
ARM: reserve syscall 378 for kcmp
ARM: 7535/1: Reprogram smp_twd based on new common clk framework notifiers
ARM: 7537/1: clk: Fix release in devm_clk_put()
ARM: 7532/1: decompressor: reset SCTLR.TRE for VMSA ARMv7 cores
ARM: 7534/1: clk: Make the managed clk functions generically available
__iomem annotation cleanup branch from Arnd.
* cleanup/__iomem: (21 commits)
net: seeq: use __iomem pointers for MMIO
video: da8xx-fb: use __iomem pointers for MMIO
scsi: eesox: use __iomem pointers for MMIO
serial: ks8695: use __iomem pointers for MMIO
input: rpcmouse: use __iomem pointers for MMIO
ARM: samsung: use __iomem pointers for MMIO
ARM: spear13xx: use __iomem pointers for MMIO
ARM: sa1100: use __iomem pointers for MMIO
ARM: prima2: use __iomem pointers for MMIO
ARM: nomadik: use __iomem pointers for MMIO
ARM: msm: use __iomem pointers for MMIO
ARM: lpc32xx: use __iomem pointers for MMIO
ARM: ks8695: use __iomem pointers for MMIO
ARM: ixp4xx: use __iomem pointers for MMIO
ARM: iop32x: use __iomem pointers for MMIO
ARM: iop13xx: use __iomem pointers for MMIO
ARM: integrator: use __iomem pointers for MMIO
ARM: imx: use __iomem pointers for MMIO
ARM: ebsa110: use __iomem pointers for MMIO
ARM: at91: use __iomem pointers for MMIO
...
Signed-off-by: Olof Johansson <olof@lixom.net>
No real need to have a separate core.h from the common.h file. Fold
these two prototypes into the common header file.
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Misc SoC-related fixes/cleanups for Samsung platforms
* 'next/devel-samsung' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
ARM: SAMSUNG: Add check for NULL in clock interface
ARM: EXYNOS: Put PCM, Slimbus, Spdif clocks to off state
ARM: EXYNOS: Add bus clock for FIMD
ARM: SAMSUNG: Fix HDMI related warnings
ARM: S3C24XX: Add .get_rate callback for "camif-upll" clock
ARM: EXYNOS: Fix incorrect help text
ARM: EXYNOS: Turn off clocks for NAND, OneNAND and TSI controllers
+ sync to 3.6-rc6
Reason for merge:
x86/fpu changed the structure of some of the code that x86/smap
changes; mostly fpu-internal.h but also minor changes to the
signal code.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Resolved Conflicts:
arch/x86/ia32/ia32_signal.c
arch/x86/include/asm/fpu-internal.h
arch/x86/kernel/signal.c
Preemption is disabled between kernel_fpu_begin/end() and as such
it is not a good idea to use these routines in kvm_load/put_guest_fpu()
which can be very far apart.
kvm_load/put_guest_fpu() routines are already called with
preemption disabled and KVM already uses the preempt notifier to save
the guest fpu state using kvm_put_guest_fpu().
So introduce __kernel_fpu_begin/end() routines which don't touch
preemption and use them instead of kernel_fpu_begin/end()
for KVM's use model of saving/restoring guest FPU state.
Also with this change (and with eagerFPU model), fix the host cr0.TS vm-exit
state in the case of VMX. For eagerFPU case, host cr0.TS is always clear.
So no need to worry about it. For the traditional lazyFPU restore case,
change the cr0.TS bit for the host state during vm-exit to be always clear
and cr0.TS bit is set in the __vmx_load_host_state() when the FPU
(guest FPU or the host task's FPU) state is not active. This ensures
that the host/guest FPU state is properly saved, restored
during context-switch and with interrupts (using irq_fpu_usable()) not
stomping on the active FPU state.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1348164109.26695.338.camel@sbsiddha-desk.sc.intel.com
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Pull sparc updates from David Miller:
1) Debugging builds on 32-bit sparc need to handle the R_SPARC_DISP32
relocation, not just 64-bit sparc. From Andreas Larsson.
2) Wei Yongjun noticed that module_alloc() on sparc can return an
error pointer, but that's not allowed. module_alloc() should
return only a valid pointer, or NULL.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
sparc: fix the return value of module_alloc()
sparc32: Enable the relocation target R_SPARC_DISP32 for sparc32
Pull x86 fixes from Ingo Molnar:
"Small fixlets"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm/init.c: Fix devmem_is_allowed() off by one
x86/kconfig: Remove outdated reference to Intel CPUs in CONFIG_SWIOTLB
The changes to entry_32.S got missed in checkin:
63bcff2a x86, smap: Add STAC and CLAC instructions to control user space access
The resulting kernel was largely functional but SMAP protection could
have been bypassed.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-9-git-send-email-hpa@linux.intel.com
Use kzalloc() so the struct resource doesn't contain garbage in
fields we don't initialize.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Use kzalloc() so the struct resource doesn't contain garbage in
fields we don't initialize.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: x86@kernel.org
Signal handling contains a bunch of accesses to individual user space
items, which causes an excessive number of STAC and CLAC
instructions. Instead, let get/put_user_try ... get/put_user_catch()
contain the STAC and CLAC instructions.
This means that get/put_user_try no longer nests, and furthermore that
it is no longer legal to use user space access functions other than
__get/put_user_ex() inside those blocks. However, these macros are
x86-specific anyway and are only used in the signal-handling paths; a
simple reordering of moving the larger subroutine calls out of the
try...catch blocks resolves that problem.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-12-git-send-email-hpa@linux.intel.com
When Supervisor Mode Access Prevention (SMAP) is enabled, access to
userspace from the kernel is controlled by the AC flag. To make the
performance of manipulating that flag acceptable, there are two new
instructions, STAC and CLAC, to set and clear it.
This patch adds those instructions, via alternative(), when the SMAP
feature is enabled. It also adds X86_EFLAGS_AC unconditionally to the
SYSCALL entry mask; there is simply no reason to make that one
conditional.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-9-git-send-email-hpa@linux.intel.com
The STAC/CLAC instructions are only available with SMAP, but on the
other hand they aren't needed if SMAP is not available, or before we
start to run userspace, so construct them as alternatives which start
out as noops and are enabled by the alternatives mechanism.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-7-git-send-email-hpa@linux.intel.com
A couple of samsung clock locking fixes, at91 device tree gpio
configuration fix and a couple more for shmobile and i.MX.
All small targeted fixes.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull arm-soc bug fixes from Olof Johansson:
"A couple of samsung clock locking fixes, at91 device tree gpio
configuration fix and a couple more for shmobile and i.MX.
All small targeted fixes."
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM i.MX25: Make timer irq work again
ARM: imx: armadillo5x0: Fix illegal register access
ARM: shmobile: kzm9g: bugfix: correct mmcif interrupt settings
ARM: SAMSUNG: Use spin_lock_{irqsave,irqrestore} in clk_set_rate
ARM: at91: fix missing #interrupt-cells on gpio-controller
ARM: SAMSUNG: use spin_lock_irqsave() in clk_set_parent
In case of error, function module_alloc() in other platform never
returns ERR_PTR(), and all of the user only check for NULL, so
we'd better return NULL instead of ERR_PTR().
dpatch engine is used to auto generated this patch.
(https://github.com/weiyj/dpatch)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
GNU Binutils 2.20.1 generates .eh_frame sections that uses R_SPARC_DISP32.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pull s390 fixes from Martin Schwidefsky:
"Bug fixes for 3.6-rc7, including some important patches for large page
related memory management issues."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/dasd: fix read unit address configuration loop
s390/dasd: fix pathgroup race
s390/mm: fix user access page-table walk code
s390/hwcaps: do not report high gprs for 31 bit kernel
s390/cio: invalidate cdev pointer before deregistration
s390/cio: fix IO subchannel event race
s390/dasd: move wake_up call
s390/hugetlb: use direct TLB flushing for hugetlbfs pages
s390/mm: fix deadlock in unmap_hugepage_range()
* Fix M2P batching re-using the incorrect structure field.
* Disable BIOS SMP MP table search.
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Merge tag 'stable/for-linus-3.6-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen bug-fixes from Konrad Rzeszutek Wilk:
- Fix M2P batching re-using the incorrect structure field.
In v3.5 we added batching for M2P override (Machine Frame Number ->
Physical Frame Number), but the original MFN was saved in an
incorrect structure - and we would oops/restore when restoring with
the old MFN.
- Disable BIOS SMP MP table search.
A bootup issue that we had ignored until we found that on DL380 G6 it
was needed.
* tag 'stable/for-linus-3.6-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/boot: Disable BIOS SMP MP table search.
xen/m2p: do not reuse kmap_op->dev_bus_addr
kcmp has appeared on x86, but has not been noticed because
checksyscalls.sh is broken at the moment. Reserve ARM syscall 378
for this should we ever need it, and add an __IGNORE entry for this
unimplemented syscall.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Exporting KVM exit information to userspace to be consumed by perf.
Signed-off-by: Dong Hao <haodong@linux.vnet.ibm.com>
[ Dong Hao <haodong@linux.vnet.ibm.com>: rebase it on acme's git tree ]
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org
Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1347870675-31495-2-git-send-email-haodong@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
While building the SUSE kernel packages, which build the scripts,
make clean, and then build everything, we have been running into spurious
build failures. We tracked them down to a simple dependency issue:
$ make mrproper
CLEAN arch/x86/tools
CLEAN scripts/basic
$ cp patches/config/x86_64/desktop .config
$ make archscripts
HOSTCC arch/x86/tools/relocs
/bin/sh: scripts/basic/fixdep: No such file or directory
make[3]: *** [arch/x86/tools/relocs] Error 1
make[2]: *** [archscripts] Error 2
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2
This was introduced by commit
6520fe55 (x86, realmode: 16-bit real-mode code support for relocs),
which added the archscripts dependency to archprepare.
This patch adds the scripts_basic dependency to the x86 archscripts.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Using for_each_set_bit() to simplify the code.
spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Merged existing board files to a single dt-capable file.
Converted irq and timer code to devicetree.
Removed existing device files that are no longer required with
devicetree support.
All existing platform devices are converted to devicetree nodes
except PWM.
Removed restart.c and moved code into vt8500.c to remove
duplicate PMC code.
Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Being a module_init call, highbank_pm_init will cause problem with
multi-platform build running on other platforms. Call it from
.init_machine instead.
Reported-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Since the dtb targets have moved to arch/arm/boot/dts/Makefile, sweep
the platforms that have had new targets added recently and move them over.
While I was at it, I also made the dtb generation more generic, i.e. if
the platform is enabled then all dtbs for that platform will be created.
Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Tony Lindgren <tony@atomide.com>
Cc: David Brown <davidb@codeaurora.com>
Cc: Barry Song <Baohua.Song@csr.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
