- 15 Dec, 2015 17 commits
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Gregory Herrero authored
Prevent dwc2 driver from accessing channel while it frees it. Acked-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Gregory Herrero authored
When completing non isoc xfer, dwc2_complete_non_isoc_xfer_ddma() is relying on qtd->n_desc to process the corresponding number of descriptors. During the processing of these descriptors, qtd could be unlinked and freed if xfer is done and urb is no more in progress. In this case, dwc2_complete_non_isoc_xfer_ddma() will read again qtd->n_desc whereas qtd has been freed. This will lead to unpredictable results since qtd->n_desc is no more valid value. To avoid this error, return a result != 0 in dwc2_process_non_isoc_desc(), so that dwc2_complete_non_isoc_xfer_ddma() stops desc processing. This has been seen with Slub debug enabled. Acked-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Gregory Herrero authored
When a channel is halted because of urb dequeue during transfer completion, no other qtds must be scheduled until halt is done. Moreover, all in progress qtds must be given back. Acked-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Gregory Herrero authored
Active bit must be enabled in all scheduled descriptors. Else transfer never start. Remove previous code which was not correctly configuring descriptors. Active bit was set before calling dwc2_fill_host_isoc_dma_desc() which is erasing dma_desc->status. Acked-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Gregory Herrero authored
Increment qtd->isoc_frame_index_last before testing it, else below check will never be true and IOC (Interrupt On Complete) bit for last frame will never be set in descriptor status. /* Set IOC for each descriptor corresponding to last frame of URB */ if (qtd->isoc_frame_index_last == qtd->urb->packet_count) dma_desc->status |= HOST_DMA_IOC; Acked-by:
John Youn <johnyoun@synopsys.com> Signed-off-by:
Gregory Herrero <gregory.herrero@intel.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Peter Chen authored
Now the function of complicated_callback is not only used for iso transfer, improve the error message to reflect it. Signed-off-by:
Peter Chen <peter.chen@freescale.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Peter Chen authored
Add both bulk and iso depth of queue for sourcesink. Reviewed-by:
Krzysztof Opasiak <k.opasiak@samsung.com> Signed-off-by:
Peter Chen <peter.chen@freescale.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Peter Chen authored
Add queue depth for both iso and bulk transfer, with more queues, we can do performance and stress test using sourcesink, and update g_zero accordingly. Reviewed-by:
Krzysztof Opasiak <k.opasiak@samsung.com> Signed-off-by:
Peter Chen <peter.chen@freescale.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
Now that we have a generic dwc3-of-simple.c, we can use that instead of maintaining dwc3-qcom.c which is extremely similar. Cc: Ivan T. Ivanov <iivanov@mm-sol.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Subbaraya Sundeep Bhatta authored
This patch adds binding doc for Xilinx DWC3 glue driver. Acked-by:
Rob Herring <robh@kernel.org> Signed-off-by:
Subbaraya Sundeep Bhatta <sbhatta@xilinx.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
For simple platforms which merely enable some clocks and populate its children, we can use this generic glue layer to avoid boilerplate code duplication. For now this supports Qcom and Xilinx, but if we find a way to add generic handling of regulators and optional PHYs, we can absorb exynos as well. Tested-by:
Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
It just ocurred to me that dwc3 already gives a really hint of when a setup packet is pending and that's the SETUP_PENDING TRB Status for EP0 IRQs. Fix setup_packet_pending initialization based on that. While at that, also make sure the comment in gadget.c matches what code is doing. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
In dwc3_cleanup_done_reqs() we expect that all iterations of our while (1) loop will find a valid struct dwc3_request *. In case we don't, we're dumping a WARN_ON_ONCE() splat so that people report the failure. This patch is a simple cleanup converting: if (!req) { WARN_ON_ONCE(1); return 1; } to: if (WARN_ON_ONCE(!req)) return 1; which is a little easier to read. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
The last few dev_dbg() messages are converted to tracepoints and we can finally ignore dev_dbg() messages during debug sessions. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
The last few dev_dbg() messages are converted to tracepoints and we can finally ignore dev_dbg() messages during debug sessions. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
The last few dev_dbg() messages are converted to tracepoints and we can finally ignore dev_dbg() messages during debug sessions. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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Felipe Balbi authored
By moving our sanity checks our internal function __dwc3_gadget_ep_queue() we can simplify the externally visible API while also making sure that callers of __dwc3_gadget_ep_queue() also make use of the same checks. Signed-off-by:
Felipe Balbi <balbi@ti.com>
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- 14 Dec, 2015 1 commit
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Linus Torvalds authored
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- 13 Dec, 2015 8 commits
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Peter Zijlstra authored
Jan Stancek reported that I wrecked things for him by fixing things for Vladimir :/ His report was due to an UNINTERRUPTIBLE wait getting -EINTR, which should not be possible, however my previous patch made this possible by unconditionally checking signal_pending(). We cannot use current->state as was done previously, because the instruction after the store to that variable it can be changed. We must instead pass the initial state along and use that. Fixes: 68985633 ("sched/wait: Fix signal handling in bit wait helpers") Reported-by:
Jan Stancek <jstancek@redhat.com> Reported-by:
Chris Mason <clm@fb.com> Tested-by:
Jan Stancek <jstancek@redhat.com> Tested-by:
Vladimir Murzin <vladimir.murzin@arm.com> Tested-by:
Chris Mason <clm@fb.com> Reviewed-by:
Paul Turner <pjt@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: tglx@linutronix.de Cc: Oleg Nesterov <oleg@redhat.com> Cc: hpa@zytor.com Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds authored
Pull NFS client bugfix from Trond Myklebust: "SUNRPC: Fix a NFSv4.1 callback channel regression" * tag 'nfs-for-4.4-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: SUNRPC: Fix callback channel
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer fixlets from Thomas Gleixner: "Two trivial fixes which add missing header fileas and forward declarations so the code will compile even when the magic include chains are different" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/gic-v3: Add missing include for barrier.h irqchip/gic-v3: Add missing struct device_node declaration
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer fix from Thomas Gleixner: "A single fix to unbreak a clocksource driver which has more than 32bit counter width" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: clocksource: Mmio: remove artificial 32bit limitation
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds authored
Pull fpga driver fixes from Greg KH: "Only two small fpga driver fixes here, both have been in linux-next for a while, and resolve some reported issues" * tag 'char-misc-4.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: fpga manager: Fix firmware resource leak on error fpga manager: remove label
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/stagingLinus Torvalds authored
Pull staging driver fixes from Greg KH: "Here are a few staging and IIO driver fixes for 4.4-rc5. All of them resolve reported problems and have been in linux-next for a while. Nothing major here, just small fixes where needed" * tag 'staging-4.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: staging: lustre: echo_copy.._lsm() dereferences userland pointers directly iio: adc: spmi-vadc: add missing of_node_put iio: fix some warning messages iio: light: apds9960: correct ->last_busy count iio: lidar: return -EINVAL on invalid signal staging: iio: dummy: complete IIO events delivery to userspace
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbLinus Torvalds authored
Pull USB driver fixes from Greg KH: "Here are a number of small USB fixes for 4.4-rc5. All of them have been in linux-next. The majority are gadget and phy issues, with a few new quirks and device ids added as well" * tag 'usb-4.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (32 commits) USB: add quirk for devices with broken LPM xhci: fix usb2 resume timing and races. usb: musb: fail with error when no DMA controller set usb: gadget: uvc: fix permissions of configfs attributes usb: musb: core: Fix pm runtime for deferred probe usb: phy: msm: fix a possible NULL dereference USB: host: ohci-at91: fix a crash in ohci_hcd_at91_overcurrent_irq usb: Quiet down false peer failure messages usb: xhci: fix config fail of FS hub behind a HS hub with MTT xhci: Fix memory leak in xhci_pme_acpi_rtd3_enable() usb: Use the USB_SS_MULT() macro to decode burst multiplier for log message USB: whci-hcd: add check for dma mapping error usb: core : hub: Fix BOS 'NULL pointer' kernel panic USB: quirks: Apply ALWAYS_POLL to all ELAN devices usb-storage: Fix scsi-sd failure "Invalid field in cdb" for USB adapter JMicron USB: quirks: Fix another ELAN touchscreen usb: dwc3: gadget: don't prestart interrupt endpoints USB: serial: Another Infineon flash loader USB ID USB: cdc_acm: Ignore Infineon Flash Loader utility USB: cp210x: Remove CP2110 ID from compatibility list ...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull ARM SoC fixes from Arnd Bergmann: "Here are a bunch of small bug fixes for various ARM platforms, nothing really sticks out this week, most of either fixes bugs in code that was just added in 4.4, or that has been broken for many years without anyone noticing. at91/sama5d2: - fix sama5de hardware setup of sd/mmc interface - proper selection of pinctrl drivers. PIO4 is necessary for sama5d2 berlin: - fix incorrect clock input for SDIO exynos: - Fix potential NULL pointer dereference in Exynos PMU driver. imx: - Fix vf610 SAI clock configuration bug which is discovered by the newly added master mode support in SAI audio driver. - Fix buggy L2 cache latency values in vf610 device trees, which may cause system hang when cpu runs at a higher frequency. ixp4xx: - fix prototypes for readl/writel functions ls2080a: - use little-endian register access for GPIO and SDHCI omap: - Fix clock source for ARM TWD and global timers on am437x - Always select REGULATOR_FIXED_VOLTAGE for omap2+ instead of when MACH_OMAP3_PANDORA is selected - Fix SPI DMA handles for dm816x as only some were mapped - Fix up mbox cells for dm816x to make mailbox usable pxa: - use PWM lookup table for all ezx machines s3c24xx: - Remove incorrect __init annotation from s3c24xx cpufreq driver structures. versatile: - fix PCI IRQ mapping on Versatile PB" * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ls2080a/dts: Add little endian property for GPIO IP block dt-bindings: define little-endian property for QorIQ GPIO ARM64: dts: ls2080a: fix eSDHC endianness ARM: dts: vf610: use reset values for L2 cache latencies ARM: pxa: use PWM lookup table for all machines ARM: dts: berlin: add 2nd clock for BG2Q sdhci0 and sdhci1 ARM: dts: berlin: correct BG2Q's sdhci2 2nd clock ARM: dts: am4372: fix clock source for arm twd and global timers ARM: at91: fix pinctrl driver selection ARM: at91/dt: add always-on to 1.8V regulator ARM: dts: vf610: fix clock definition for SAI2 ARM: imx: clk-vf610: fix SAI clock tree ARM: ixp4xx: fix read{b,w,l} return types irqchip/versatile-fpga: Fix PCI IRQ mapping on Versatile PB ARM: OMAP2+: enable REGULATOR_FIXED_VOLTAGE ARM: dts: add dm816x missing spi DT dma handles ARM: dts: add dm816x missing #mbox-cells cpufreq: s3c24xx: Do not mark s3c2410_plls_add as __init ARM: EXYNOS: Fix potential NULL pointer access in exynos_sys_powerdown_conf
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- 12 Dec, 2015 14 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull powerpc fixes from Michael Ellerman: - opal-irqchip: Fix double endian conversion from Alistair Popple - cxl: Set endianess of kernel contexts from Frederic Barrat - sbc8641: drop bogus PHY IRQ entries from DTS file from Paul Gortmaker - Revert "powerpc/eeh: Don't unfreeze PHB PE after reset" from Andrew Donnellan * tag 'powerpc-4.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: Revert "powerpc/eeh: Don't unfreeze PHB PE after reset" powerpc/sbc8641: drop bogus PHY IRQ entries from DTS file cxl: Set endianess of kernel contexts powerpc/opal-irqchip: Fix double endian conversion
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Linus Torvalds authored
Merge misc fixes from Andrew Morton: "17 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: MIPS: fix DMA contiguous allocation sh64: fix __NR_fgetxattr ocfs2: fix SGID not inherited issue mm/oom_kill.c: avoid attempting to kill init sharing same memory drivers/base/memory.c: prohibit offlining of memory blocks with missing sections tmpfs: fix shmem_evict_inode() warnings on i_blocks mm/hugetlb.c: fix resv map memory leak for placeholder entries mm: hugetlb: call huge_pte_alloc() only if ptep is null kernel: remove stop_machine() Kconfig dependency mm: kmemleak: mark kmemleak_init prototype as __init mm: fix kerneldoc on mem_cgroup_replace_page osd fs: __r4w_get_page rely on PageUptodate for uptodate MAINTAINERS: make Vladimir co-maintainer of the memory controller mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress mm: fix swapped Movable and Reclaimable in /proc/pagetypeinfo memcg: fix memory.high target mm: hugetlb: fix hugepage memory leak caused by wrong reserve count
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fixes from Helge Deller: "Fix the boot crash on Mako machines with Huge Pages, prevent a panic with SATA controllers (and others) by correctly calculating the IOMMU space, hook up the mlock2 syscall and drop unneeded code in the parisc pci code" * 'parisc-4.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Disable huge pages on Mako machines parisc: Wire up mlock2 syscall parisc: Remove unused pcibios_init_bus() parisc iommu: fix panic due to trying to allocate too large region
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull block layer fixes from Jens Axboe: "A set of fixes for the current series. This contains: - A bunch of fixes for lightnvm, should be the last round for this series. From Matias and Wenwei. - A writeback detach inode fix from Ilya, also marked for stable. - A block (though it says SCSI) fix for an OOPS in SCSI runtime power management. - Module init error path fixes for null_blk from Minfei" * 'for-linus' of git://git.kernel.dk/linux-block: null_blk: Fix error path in module initialization lightnvm: do not compile in debugging by default lightnvm: prevent gennvm module unload on use lightnvm: fix media mgr registration lightnvm: replace req queue with nvmdev for lld lightnvm: comments on constants lightnvm: check mm before use lightnvm: refactor spin_unlock in gennvm_get_blk lightnvm: put blks when luns configure failed lightnvm: use flags in rrpc_get_blk block: detach bdev inode from its wb in __blkdev_put() SCSI: Fix NULL pointer dereference in runtime PM
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fixes from Catalin Marinas: - Update the linker script to use L1_CACHE_BYTES instead of hard-coded 64. We recently changed L1_CACHE_BYTES to 128 - Improve race condition reporting on set_pte_at() and change the BUG to WARN_ONCE. With hardware update of the accessed/dirty state, we need to ensure that set_pte_at() does not inadvertently override hardware updated state. The patch also makes the checks ignore !pte_valid() new entries * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: Improve error reporting on set_pte_at() checks arm64: update linker script to increased L1_CACHE_BYTES value
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Qais Yousef authored
Recent changes to how GFP_ATOMIC is defined seems to have broken the condition to use mips_alloc_from_contiguous() in mips_dma_alloc_coherent(). I couldn't bottom out the exact change but I think it's this commit d0164adc ("mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd"). GFP_ATOMIC has multiple bits set and the check for !(gfp & GFP_ATOMIC) isn't enough. The reason behind this condition is to check whether we can potentially do a sleeping memory allocation. Use gfpflags_allow_blocking() instead which should be more robust. Signed-off-by:
Qais Yousef <qais.yousef@imgtec.com> Acked-by:
Mel Gorman <mgorman@techsingularity.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Dmitry V. Levin authored
According to arch/sh/kernel/syscalls_64.S and common sense, __NR_fgetxattr has to be defined to 259, but it doesn't. Instead, it's defined to 269, which is of course used by another syscall, __NR_sched_setaffinity in this case. This bug was found by strace test suite. Signed-off-by:
Dmitry V. Levin <ldv@altlinux.org> Acked-by:
Geert Uytterhoeven <geert+renesas@glider.be> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Junxiao Bi authored
Commit 8f1eb487 ("ocfs2: fix umask ignored issue") introduced an issue, SGID of sub dir was not inherited from its parents dir. It is because SGID is set into "inode->i_mode" in ocfs2_get_init_inode(), but is overwritten by "mode" which don't have SGID set later. Fixes: 8f1eb487 ("ocfs2: fix umask ignored issue") Signed-off-by:
Junxiao Bi <junxiao.bi@oracle.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Acked-by:
Srinivas Eeda <srinivas.eeda@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Chen Jie authored
It's possible that an oom killed victim shares an ->mm with the init process and thus oom_kill_process() would end up trying to kill init as well. This has been shown in practice: Out of memory: Kill process 9134 (init) score 3 or sacrifice child Killed process 9134 (init) total-vm:1868kB, anon-rss:84kB, file-rss:572kB Kill process 1 (init) sharing same memory ... Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 And this will result in a kernel panic. If a process is forked by init and selected for oom kill while still sharing init_mm, then it's likely this system is in a recoverable state. However, it's better not to try to kill init and allow the machine to panic due to unkillable processes. [rientjes@google.com: rewrote changelog] [akpm@linux-foundation.org: fix inverted test, per Ben] Signed-off-by:
Chen Jie <chenjie6@huawei.com> Signed-off-by:
David Rientjes <rientjes@google.com> Acked-by:
Michal Hocko <mhocko@suse.com> Acked-by:
Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Li Zefan <lizefan@huawei.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Seth Jennings authored
Commit bdee237c ("x86: mm: Use 2GB memory block size on large-memory x86-64 systems") and 982792c7 ("x86, mm: probe memory block size for generic x86 64bit") introduced large block sizes for x86. This made it possible to have multiple sections per memory block where previously, there was a only every one section per block. Since blocks consist of contiguous ranges of section, there can be holes in the blocks where sections are not present. If one attempts to offline such a block, a crash occurs since the code is not designed to deal with this. This patch is a quick fix to gaurd against the crash by not allowing blocks with non-present sections to be offlined. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=107781Signed-off-by:
Seth Jennings <sjennings@variantweb.net> Reported-by:
Andrew Banman <abanman@sgi.com> Cc: Daniel J Blueman <daniel@numascale.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Greg KH <greg@kroah.com> Cc: Russ Anderson <rja@sgi.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Hugh Dickins authored
Dmitry Vyukov provides a little program, autogenerated by syzkaller, which races a fault on a mapping of a sparse memfd object, against truncation of that object below the fault address: run repeatedly for a few minutes, it reliably generates shmem_evict_inode()'s WARN_ON(inode->i_blocks). (But there's nothing specific to memfd here, nor to the fstat which it happened to use to generate the fault: though that looked suspicious, since a shmem_recalc_inode() had been added there recently. The same problem can be reproduced with open+unlink in place of memfd_create, and with fstatfs in place of fstat.) v3.7 commit 0f3c42f5 ("tmpfs: change final i_blocks BUG to WARNING") explains one cause of such a warning (a race with shmem_writepage to swap), and possible solutions; but we never took it further, and this syzkaller incident turns out to have a different cause. shmem_getpage_gfp()'s error recovery, when a freshly allocated page is then found to be beyond eof, looks plausible - decrementing the alloced count that was just before incremented - but in fact can go wrong, if a racing thread (the truncator, for example) gets its shmem_recalc_inode() in just after our delete_from_page_cache(). delete_from_page_cache() decrements nrpages, that shmem_recalc_inode() will balance the books by decrementing alloced itself, then our decrement of alloced take it one too low: leading to the WARNING when the object is finally evicted. Once the new page has been exposed in the page cache, shmem_getpage_gfp() must leave it to shmem_recalc_inode() itself to get the accounting right in all cases (and not fall through from "trunc:" to "decused:"). Adjust that error recovery block; and the reinitialization of info and sbinfo can be removed too. While we're here, fix shmem_writepage() to avoid the original issue: it will be safe against a racing shmem_recalc_inode(), if it merely increments swapped before the shmem_delete_from_page_cache() which decrements nrpages (but it must then do its own shmem_recalc_inode() before that, while still in balance, instead of after). (Aside: why do we shmem_recalc_inode() here in the swap path? Because its raison d'etre is to cope with clean sparse shmem pages being reclaimed behind our back: so here when swapping is a good place to look for that case.) But I've not now managed to reproduce this bug, even without the patch. I don't see why I didn't do that earlier: perhaps inhibited by the preference to eliminate shmem_recalc_inode() altogether. Driven by this incident, I do now have a patch to do so at last; but still want to sit on it for a bit, there's a couple of questions yet to be resolved. Signed-off-by:
Hugh Dickins <hughd@google.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Mike Kravetz authored
Dmitry Vyukov reported the following memory leak unreferenced object 0xffff88002eaafd88 (size 32): comm "a.out", pid 5063, jiffies 4295774645 (age 15.810s) hex dump (first 32 bytes): 28 e9 4e 63 00 88 ff ff 28 e9 4e 63 00 88 ff ff (.Nc....(.Nc.... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: kmalloc include/linux/slab.h:458 region_chg+0x2d4/0x6b0 mm/hugetlb.c:398 __vma_reservation_common+0x2c3/0x390 mm/hugetlb.c:1791 vma_needs_reservation mm/hugetlb.c:1813 alloc_huge_page+0x19e/0xc70 mm/hugetlb.c:1845 hugetlb_no_page mm/hugetlb.c:3543 hugetlb_fault+0x7a1/0x1250 mm/hugetlb.c:3717 follow_hugetlb_page+0x339/0xc70 mm/hugetlb.c:3880 __get_user_pages+0x542/0xf30 mm/gup.c:497 populate_vma_page_range+0xde/0x110 mm/gup.c:919 __mm_populate+0x1c7/0x310 mm/gup.c:969 do_mlock+0x291/0x360 mm/mlock.c:637 SYSC_mlock2 mm/mlock.c:658 SyS_mlock2+0x4b/0x70 mm/mlock.c:648 Dmitry identified a potential memory leak in the routine region_chg, where a region descriptor is not free'ed on an error path. However, the root cause for the above memory leak resides in region_del. In this specific case, a "placeholder" entry is created in region_chg. The associated page allocation fails, and the placeholder entry is left in the reserve map. This is "by design" as the entry should be deleted when the map is released. The bug is in the region_del routine which is used to delete entries within a specific range (and when the map is released). region_del did not handle the case where a placeholder entry exactly matched the start of the range range to be deleted. In this case, the entry would not be deleted and leaked. The fix is to take these special placeholder entries into account in region_del. The region_chg error path leak is also fixed. Fixes: feba16e2 ("mm/hugetlb: add region_del() to delete a specific range of entries") Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Acked-by:
Hillf Danton <hillf.zj@alibaba-inc.com> Cc: <stable@vger.kernel.org> [4.3+] Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Naoya Horiguchi authored
Currently at the beginning of hugetlb_fault(), we call huge_pte_offset() and check whether the obtained *ptep is a migration/hwpoison entry or not. And if not, then we get to call huge_pte_alloc(). This is racy because the *ptep could turn into migration/hwpoison entry after the huge_pte_offset() check. This race results in BUG_ON in huge_pte_alloc(). We don't have to call huge_pte_alloc() when the huge_pte_offset() returns non-NULL, so let's fix this bug with moving the code into else block. Note that the *ptep could turn into a migration/hwpoison entry after this block, but that's not a problem because we have another !pte_present check later (we never go into hugetlb_no_page() in that case.) Fixes: 290408d4 ("hugetlb: hugepage migration core") Signed-off-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by:
Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by:
David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: <stable@vger.kernel.org> [2.6.36+] Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Chris Wilson authored
Currently the full stop_machine() routine is only enabled on SMP if module unloading is enabled, or if the CPUs are hotpluggable. This leads to configurations where stop_machine() is broken as it will then only run the callback on the local CPU with irqs disabled, and not stop the other CPUs or run the callback on them. For example, this breaks MTRR setup on x86 in certain configs since ea8596bb ("kprobes/x86: Remove unused text_poke_smp() and text_poke_smp_batch() functions") as the MTRR is only established on the boot CPU. This patch removes the Kconfig option for STOP_MACHINE and uses the SMP and HOTPLUG_CPU config options to compile the correct stop_machine() for the architecture, removing the false dependency on MODULE_UNLOAD in the process. Link: https://lkml.org/lkml/2014/10/8/124 References: https://bugs.freedesktop.org/show_bug.cgi?id=84794Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Acked-by:
Ingo Molnar <mingo@kernel.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Pranith Kumar <bobby.prani@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Vladimir Davydov <vdavydov@parallels.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: H. Peter Anvin <hpa@linux.intel.com> Cc: Tejun Heo <tj@kernel.org> Cc: Iulia Manda <iulia.manda21@gmail.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Chuck Ebbert <cebbert.lkml@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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