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2016-02-29arm64: KVM: Skip HYP setup when already running in HYPMarc Zyngier
With the kernel running at EL2, there is no point trying to configure page tables for HYP, as the kernel is already mapped. Take this opportunity to refactor the whole init a bit, allowing the various parts of the hypervisor bringup to be split across multiple functions. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm64: Add ARM64_HAS_VIRT_HOST_EXTN featureMarc Zyngier
Add a new ARM64_HAS_VIRT_HOST_EXTN features to indicate that the CPU has the ARMv8.1 VHE capability. This will be used to trigger kernel patching in KVM. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm64: Allow the arch timer to use the HYP timerMarc Zyngier
With the ARMv8.1 VHE, the kernel can run in HYP mode, and thus use the HYP timer instead of the normal guest timer in a mostly transparent way, except for the interrupt line. This patch reworks the arch timer code to allow the selection of the HYP PPI, possibly falling back to the guest timer if not available. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm/arm64: Add new is_kernel_in_hyp_mode predicateMarc Zyngier
With ARMv8.1 VHE extension, it will be possible to run the kernel at EL2 (aka HYP mode). In order for the kernel to easily find out where it is running, add a new predicate that returns whether or not the kernel is in HYP mode. For completeness, the 32bit code also get such a predicate (always returning false) so that code common to both architecture (timers, KVM) can use it transparently. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm64: KVM: Switch to C-based stage2 initMarc Zyngier
There is no real need to leave the stage2 initialization as part of the early HYP bootstrap, and we can easily postpone it to the point where we can safely run C code. This will help VHE, which doesn't need any of this bootstrap. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm/arm64: KVM: Handle out-of-RAM cache maintenance as a NOPMarc Zyngier
So far, our handling of cache maintenance by VA has been pretty simple: Either the access is in the guest RAM and generates a S2 fault, which results in the page being mapped RW, or we go down the io_mem_abort() path, and nuke the guest. The first one is fine, but the second one is extremely weird. Treating the CM as an I/O is wrong, and nothing in the ARM ARM indicates that we should generate a fault for something that cannot end-up in the cache anyway (even if the guest maps it, it will keep on faulting at stage-2 for emulation). So let's just skip this instruction, and let the guest get away with it. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove __kvm_hyp_exit/__kvm_hyp_exit_endMarc Zyngier
I have no idea what these were for - probably a leftover from an early implementation. Good bye! Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove handling of ARM_EXCEPTION_DATA/PREF_ABORTMarc Zyngier
These are now handled as a panic, so there is little point in keeping them around. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove unused hyp_pc fieldMarc Zyngier
This field was never populated, and the panic code already does something similar. Delete the related code. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Cleanup asm-offsets.cMarc Zyngier
Since we don't have much assembler left, most of the KVM stuff in asm-offsets.c is now superfluous. Let's get rid of it. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Turn CP15 defines to an enumMarc Zyngier
Just like on arm64, having the CP15 registers expressed as a set of #defines has been very conflict-prone. Let's turn it into an enum, which should make it more manageable. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove __weak attributesMarc Zyngier
Now that the old code is long gone, we can remove all the weak attributes, as there is only one version of the code. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Switch to C-based stage2 initMarc Zyngier
As we now have hooks to setup VTCR from C code, let's drop the original VTCR setup and reimplement it as part of the HYP code. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove the old world switchMarc Zyngier
As we now have a full reimplementation of the world switch, it is time to kiss the old stuff goodbye. I'm not sure we'll miss it. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Change kvm_call_hyp return type to unsigned longMarc Zyngier
Having u64 as the kvm_call_hyp return type is problematic, as it forces all kind of tricks for the return values from HYP to be promoted to 64bit (LE has the LSB in r0, and BE has them in r1). Since the only user of the return value is perfectly happy with a 32bit value, let's make kvm_call_hyp return an unsigned long, which is 32bit on ARM. This solves yet another headache. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add panic handling codeMarc Zyngier
Instead of spinning forever, let's "properly" handle any unexpected exception ("properly" meaning "print a spat on the console and die"). This has proved useful quite a few times... Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add HYP mode entry codeMarc Zyngier
This part is almost entierely borrowed from the existing code, just slightly simplifying the HYP function call (as we now save SPSR_hyp in the world switch). Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add populating of fault data structureMarc Zyngier
On guest exit, we must take care of populating our fault data structure so that the host code can handle it. This includes resolving the IPA for permission faults, which can result in restarting the guest. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add the new world switch implementationMarc Zyngier
The new world switch implementation is modeled after the arm64 one, calling the various save/restore functions in turn, and having as little state as possible. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add VFP lazy save/restore handlerMarc Zyngier
Similar to the arm64 version, add the code that deals with VFP traps, re-enabling VFP, save/restoring the registers and resuming the guest. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add guest entry codeMarc Zyngier
Add the very minimal piece of code that is now required to jump into the guest (and return from it). This code is only concerned with save/restoring the USR registers (r0-r12+lr for the guest, r4-r12+lr for the host), as everything else is dealt with in C (VFP is another matter though). Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add banked registers save/restoreMarc Zyngier
Banked registers are one of the many perks of the 32bit architecture, and the world switch needs to cope with it. This requires some "special" accessors, as these are not accessed using a standard coprocessor instruction. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add VFP save/restoreMarc Zyngier
This is almost a copy/paste of the existing version, with a couple of subtle differences: - Only write to FPEXC once on the save path - Add an isb when enabling VFP access The patch also defines a few sysreg accessors and a __vfp_enabled predicate that test the VFP trapping state. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add vgic v2 save/restoreMarc Zyngier
This patch shouldn't exist, as we should be able to reuse the arm64 version for free. I'll get there eventually, but in the meantime I need an interrupt controller. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add timer save/restoreMarc Zyngier
This patch shouldn't exist, as we should be able to reuse the arm64 version for free. I'll get there eventually, but in the meantime I need a timer ticking. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add CP15 save/restore codeMarc Zyngier
Concert the CP15 save/restore code to C. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add TLB invalidation codeMarc Zyngier
Convert the TLB invalidation code to C, hooking it into the build system whilst we're at it. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add system register accessor macrosMarc Zyngier
In order to move system register (CP15, mostly) access to C code, add a few macros to facilitate this, and minimize the difference between 32 and 64bit CP15 registers. This will get heavily used in the following patches. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Add a HYP-specific header fileMarc Zyngier
In order to expose the various HYP services that are private to the hypervisor, add a new hyp.h file. So far, it only contains mundane things such as section annotation and VA manipulation. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Move GP registers into the CPU context structureMarc Zyngier
Continuing our rework of the CPU context, we now move the GP registers into the CPU context structure. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Move CP15 array into the CPU context structureMarc Zyngier
Continuing our rework of the CPU context, we now move the CP15 array into the CPU context structure. As this causes quite a bit of churn, we introduce the vcpu_cp15() macro that abstract the location of the actual array. This will probably help next time we have to revisit that code. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Move VFP registers to a CPU context structureMarc Zyngier
In order to turn the WS code into something that looks a bit more like the arm64 version, move the VFP registers into a CPU context container for both the host and the guest. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Remove __kvm_hyp_code_start/__kvm_hyp_code_endMarc Zyngier
Now that we've unified the way we refer to the HYP text between arm and arm64, drop __kvm_hyp_code_start/end, and just use the __hyp_text_start/end symbols. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29ARM: KVM: Move the HYP code to its own sectionMarc Zyngier
In order to be able to spread the HYP code into multiple compilation units, adopt a layout similar to that of arm64: - the HYP text is emited in its own section (.hyp.text) - two linker generated symbols are use to identify the boundaries of that section No functionnal change. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-29arm/arm64: KVM: Add hook for C-based stage2 initMarc Zyngier
As we're about to move the stage2 init to C code, introduce some C hooks that will later be populated with arch-specific implementations. Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2016-02-28Linux 4.5-rc6Linus Torvalds
2016-02-28Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Thomas Gleixner: "A rather largish series of 12 patches addressing a maze of race conditions in the perf core code from Peter Zijlstra" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Robustify task_function_call() perf: Fix scaling vs. perf_install_in_context() perf: Fix scaling vs. perf_event_enable() perf: Fix scaling vs. perf_event_enable_on_exec() perf: Fix ctx time tracking by introducing EVENT_TIME perf: Cure event->pending_disable race perf: Fix race between event install and jump_labels perf: Fix cloning perf: Only update context time when active perf: Allow perf_release() with !event->ctx perf: Do not double free perf: Close install vs. exit race
2016-02-28Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Thomas Gleixner: "This update contains: - Hopefully the last ASM CLAC fixups - A fix for the Quark family related to the IMR lock which makes kexec work again - A off-by-one fix in the MPX code. Ironic, isn't it? - A fix for X86_PAE which addresses once more an unsigned long vs phys_addr_t hickup" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mpx: Fix off-by-one comparison with nr_registers x86/mm: Fix slow_virt_to_phys() for X86_PAE again x86/entry/compat: Add missing CLAC to entry_INT80_32 x86/entry/32: Add an ASM_CLAC to entry_SYSENTER_32 x86/platform/intel/quark: Change the kernel's IMR lock bit to false
2016-02-28Merge branch 'sched-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler fixlet from Thomas Gleixner: "A trivial printk typo fix" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/deadline: Fix trivial typo in printk() message
2016-02-28Merge branch 'irq-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull irq fixes from Thomas Gleixner: "Four small fixes for irqchip drivers: - Add missing low level irq handler initialization on mxs, so interrupts can acutally be delivered - Add a missing barrier to the GIC driver - Two fixes for the GIC-V3-ITS driver, addressing a double EOI write and a cache flush beyond the actual region" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/gic-v3: Add missing barrier to 32bit version of gic_read_iar() irqchip/mxs: Add missing set_handle_irq() irqchip/gicv3-its: Avoid cache flush beyond ITS_BASERn memory size irqchip/gic-v3-its: Fix double ICC_EOIR write for LPI in EOImode==1
2016-02-28Merge tag 'staging-4.5-rc6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging Pull staging/android fix from Greg KH: "Here is one patch, for the android binder driver, to resolve a reported problem. Turns out it has been around for a while (since 3.15), so it is good to finally get it resolved. It has been in linux-next for a while with no reported issues" * tag 'staging-4.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: drivers: android: correct the size of struct binder_uintptr_t for BC_DEAD_BINDER_DONE
2016-02-28Merge tag 'usb-4.5-rc6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb Pull USB fixes from Greg KH: "Here are a few USB fixes for 4.5-rc6 They fix a reported bug for some USB 3 devices by reverting the recent patch, a MAINTAINERS change for some drivers, some new device ids, and of course, the usual bunch of USB gadget driver fixes. All have been in linux-next for a while with no reported issues" * tag 'usb-4.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: MAINTAINERS: drop OMAP USB and MUSB maintainership usb: musb: fix DMA for host mode usb: phy: msm: Trigger USB state detection work in DRD mode usb: gadget: net2280: fix endpoint max packet for super speed connections usb: gadget: gadgetfs: unregister gadget only if it got successfully registered usb: gadget: remove driver from pending list on probe error Revert "usb: hub: do not clear BOS field during reset device" usb: chipidea: fix return value check in ci_hdrc_pci_probe() usb: chipidea: error on overflow for port_test_write USB: option: add "4G LTE usb-modem U901" USB: cp210x: add IDs for GE B650V3 and B850V3 boards USB: option: add support for SIM7100E usb: musb: Fix DMA desired mode for Mentor DMA engine usb: gadget: fsl_qe_udc: fix IS_ERR_VALUE usage usb: dwc2: USB_DWC2 should depend on HAS_DMA usb: dwc2: host: fix the data toggle error in full speed descriptor dma usb: dwc2: host: fix logical omissions in dwc2_process_non_isoc_desc usb: dwc3: Fix assignment of EP transfer resources usb: dwc2: Add extra delay when forcing dr_mode
2016-02-28Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs fixes from Al Viro. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: do_last(): ELOOP failure exit should be done after leaving RCU mode should_follow_link(): validate ->d_seq after having decided to follow namei: ->d_inode of a pinned dentry is stable only for positives do_last(): don't let a bogus return value from ->open() et.al. to confuse us fs: return -EOPNOTSUPP if clone is not supported hpfs: don't truncate the file when delete fails
2016-02-28Merge tag 'armsoc-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC fixes from Olof Johansson: "We didn't have a batch last week, so this one is slightly larger. None of them are scary though, a handful of fixes for small DT pieces, replacing properties with newer conventions. Highlights: - N900 fix for setting system revision - onenand init fix to avoid filesystem corruption - Clock fix for audio on Beaglebone-x15 - Fixes on shmobile to deal with CONFIG_DEBUG_RODATA (default y in 4.6) + misc smaller stuff" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: MAINTAINERS: Extend info, add wiki and ml for meson arch MAINTAINERS: alpine: add a new maintainer and update the entry ARM: at91/dt: fix typo in sama5d2 pinmux descriptions ARM: OMAP2+: Fix onenand initialization to avoid filesystem corruption Revert "regulator: tps65217: remove tps65217.dtsi file" ARM: shmobile: Remove shmobile_boot_arg ARM: shmobile: Move shmobile_smp_{mpidr, fn, arg}[] from .text to .bss ARM: shmobile: r8a7779: Remove remainings of removed SCU boot setup code ARM: shmobile: Move shmobile_scu_base from .text to .bss ARM: OMAP2+: Fix omap_device for module reload on PM runtime forbid ARM: OMAP2+: Improve omap_device error for driver writers ARM: DTS: am57xx-beagle-x15: Select SYS_CLK2 for audio clocks ARM: dts: am335x/am57xx: replace gpio-key,wakeup with wakeup-source property ARM: OMAP2+: Set system_rev from ATAGS for n900 ARM: dts: orion5x: fix the missing mtd flash on linkstation lswtgl ARM: dts: kirkwood: use unique machine name for ds112 ARM: dts: imx6: remove bogus interrupt-parent from CAAM node
2016-02-28do_last(): ELOOP failure exit should be done after leaving RCU modeAl Viro
... or we risk seeing a bogus value of d_is_symlink() there. Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-02-28should_follow_link(): validate ->d_seq after having decided to followAl Viro
... otherwise d_is_symlink() above might have nothing to do with the inode value we've got. Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-02-28namei: ->d_inode of a pinned dentry is stable only for positivesAl Viro
both do_last() and walk_component() risk picking a NULL inode out of dentry about to become positive, *then* checking its flags and seeing that it's not negative anymore and using (already stale by then) value they'd fetched earlier. Usually ends up oopsing soon after that... Cc: stable@vger.kernel.org # v3.13+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-02-28do_last(): don't let a bogus return value from ->open() et.al. to confuse usAl Viro
... into returning a positive to path_openat(), which would interpret that as "symlink had been encountered" and proceed to corrupt memory, etc. It can only happen due to a bug in some ->open() instance or in some LSM hook, etc., so we report any such event *and* make sure it doesn't trick us into further unpleasantness. Cc: stable@vger.kernel.org # v3.6+, at least Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-02-28fs: return -EOPNOTSUPP if clone is not supportedChristoph Hellwig
-EBADF is a rather confusing error if an operations is not supported, and nfsd gets rather upset about it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-02-28hpfs: don't truncate the file when delete failsMikulas Patocka
The delete opration can allocate additional space on the HPFS filesystem due to btree split. The HPFS driver checks in advance if there is available space, so that it won't corrupt the btree if we run out of space during splitting. If there is not enough available space, the HPFS driver attempted to truncate the file, but this results in a deadlock since the commit 7dd29d8d865efdb00c0542a5d2c87af8c52ea6c7 ("HPFS: Introduce a global mutex and lock it on every callback from VFS"). This patch removes the code that tries to truncate the file and -ENOSPC is returned instead. If the user hits -ENOSPC on delete, he should try to delete other files (that are stored in a leaf btree node), so that the delete operation will make some space for deleting the file stored in non-leaf btree node. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: stable@vger.kernel.org # 2.6.39+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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