- 02 Mar, 2016 5 commits
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Heiko Carstens authored
git commit 26f15caa ("s390/cmpxchg: simplify cmpxchg_double") removed support for cmpxchg_double for two consecutive four byte values, for which it would generate a cds instruction. However I forgot to remove the corresponding define in our percpu header file, which means that this_cpu_cmpxchg_double would now incorrectly generate a cdsg instruction if being used on a double four byte location. Therefore remove the percpu define as well. There is currently no user and therefore no bug fixed with this. Obviously any such user could and should simply use cmpxchg. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Christian Borntraeger authored
commit e22cf8ca ("s390/cpumf: rework program parameter setting to detect guest samples") requires guest changes to get proper guest/host. We can do better: We can use the primary asn value, which is set on all Linux variants to compare this with the host pp value. We now have the following cases: 1. Guest using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp != 0 --> guest 2. Guest not using PP host sample: gpp == 0, asn == hpp --> host guest sample: gpp == 0, asn != hpp --> guest As soon as the host no longer sets CR4, we must back out this heuristics - let's add a comment in switch_to. Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by:
Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
We have two close to identical report_user_fault functions. Add a parameter to one and get rid of the other one in order to reduce code duplication. Signed-off-by:
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Heiko Carstens authored
The double escape character sequence introduced with commit 272fa59c ("s390/dis: Fix handling of format specifiers") is not necessary anymore since commit 561e1030 ("s390/dis: Fix printing of the register numbers"). Instead this now generates an extra '%' character: lg %%r1,160(%%r11) So fix this and basically revert 272fa59c. Signed-off-by:
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Martin Schwidefsky authored
Git commit ab3f285f "KVM: s390/mm: try a cow on read only pages for key ops" added a fixup_user_fault to set_guest_storage_key force a copy on write if the page is mapped read-only. This is supposed to fix the problem of differing storage keys for shared mappings, e.g. the empty_zero_page. But if the storage key is set before the pte is mapped the storage key update is done on the pgste. A later fault will happily map the shared page with the key from the pgste. Eventually git commit 2faee8ff "s390/mm: prevent and break zero page mappings in case of storage keys" fixed this problem for the empty_zero_page. The commit makes sure that guests enabled for storage keys will not use the empty_zero_page at all. As the call to fixup_user_fault in set_guest_storage_key depends on the order of the storage key operation vs. the fault that maps the pte it does not really fix anything. Just remove it. Reviewed-by:
Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by:
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- 24 Feb, 2016 2 commits
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Heiko Carstens authored
Signed-off-by:
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Heiko Carstens authored
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- 23 Feb, 2016 11 commits
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Martin Schwidefsky authored
The comment describing the bit encoding for segment table entries is incorrect in regard to the read and write bits. The segment read bit is 0x0002 and write is 0x0001, not the other way around. Reported-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
We have four different stack tracers of which three had bugs. So it's time to merge them to a single stack tracer which allows to specify a call back function which will be called for each step. This patch changes behavior a bit: - the "nosched" and "in_sched_functions" check within save_stack_trace_tsk did work only for the last stack frame within a context. Now it considers the check for each stack frame like it should. - both the oprofile variant and the perf_events variant did save a return address twice if a zero back chain was detected, which indicates an interrupt frame. The new dump_trace function will call the oprofile and perf_events backends with the psw address that is contained within the corresponding pt_regs structure instead. - the original show_trace and save_context_stack functions did already use the psw address of the pt_regs structure if a zero back chain was detected. However now we ignore the psw address if it is a user space address. After all we trace the kernel stack and not the user space stack. This way we also get rid of the garbage user space address in case of warnings and / or panic call traces. So this should make life easier since now there is only one stack tracer left which we can break. Signed-off-by:
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Martin Schwidefsky authored
The first parameter of pgste_update_all is a pointer to a pte. Simplify the code by passing the pte value. Signed-off-by: -
Stefan Haberland authored
The correct lock order for LCU lock and cdev lock is to take the cdev lock first and afterwards the LCU lock. This is caused by the fact that LCU functions are called in an interrupt context with the cdev lock implicitly hold by CIO. To assure the right locking order but also be able to iterate over devices in a LCU introduce a trylock block that can be called with the device lock for one device hold and then takes the LCU lock and try to lock all devices accounted to this LCU. Afterwards all devices and the LCU itself are locked. Signed-off-by:
Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
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Heiko Carstens authored
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Heiko Carstens authored
Implement current_stack_pointer() helper function and use it everywhere, instead of having several different inline assembly variants. Signed-off-by:
Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Use the inversed "nosched" logic like all other architectures. Signed-off-by:
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Martin Schwidefsky authored
The change of the access rights for an address range in the kernel address space is currently done with a loop of IPTE + a store of the modified PTE. Between the IPTE and the store the PTE will be invalid, this intermediate state can cause problems with concurrent accesses. Consider a change of a kernel area from read-write to read-only, a concurrent reader of that area should be fine but with the invalid PTE it might get an unexpected exception. Remove the IPTEs for each PTE and do a global flush after all PTEs have been modified. Reviewed-by:
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Martin Schwidefsky authored
Acked-by:
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Sebastian Ott authored
For each PCI function we need to maintain arch specific data in struct zpci_dev which also contains a pointer to struct pci_dev. When a function is registered or deregistered (which is triggered by PCI common code) we need to adjust that pointer which could interfere with the machine check handler (triggered by FW) using zpci_dev->pdev. Since multiple instances of the same pdev could exist at a time this can't be solved with locking. Fix that by ditching the pdev pointer and use a bus walk to reach struct pci_dev (only one instance of a pdev can be registered at the bus at a time). Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by:
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- 22 Feb, 2016 2 commits
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Martin Schwidefsky authored
git commit 904818e2 "s390/kernel: introduce fpu-internal.h with fpu helper functions" introduced the fpregs_store / fp_regs_load helper. These function fail to save and restore the floating pointer control registers. The effect is that the FPC is not correctly handled on signal delivery and signal return. Cc: stable@vger.kernel.org # 4.4 Signed-off-by:
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Martin Schwidefsky authored
git commit 80703617 "s390: add support for vector extension" broke 31-bit compat processes in regard to signal handling. The restore_sigregs_ext32() function is used to restore the additional elements from the user space signal frame. Among the additional elements are the upper registers halves for 64-bit register support for 31-bit processes. The copy_from_user that is used to retrieve the high-gprs array from the user stack uses an incorrect length, 8 bytes instead of 64 bytes. This causes incorrect upper register halves to get loaded. Cc: stable@vger.kernel.org # 3.8+ Signed-off-by:
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- 20 Feb, 2016 8 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Ingo Molnar: "This is unusually large, partly due to the EFI fixes that prevent accidental deletion of EFI variables through efivarfs that may brick machines. These fixes are somewhat involved to maintain compatibility with existing install methods and other usage modes, while trying to turn off the 'rm -rf' bricking vector. Other fixes are for large page ioremap()s and for non-temporal user-memcpy()s" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Fix vmalloc_fault() to handle large pages properly hpet: Drop stale URLs x86/uaccess/64: Handle the caching of 4-byte nocache copies properly in __copy_user_nocache() x86/uaccess/64: Make the __copy_user_nocache() assembly code more readable lib/ucs2_string: Correct ucs2 -> utf8 conversion efi: Add pstore variables to the deletion whitelist efi: Make efivarfs entries immutable by default efi: Make our variable validation list include the guid efi: Do variable name validation tests in utf8 efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version lib/ucs2_string: Add ucs2 -> utf8 helper functions
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf fixes from Ingo Molnar: "A handful of CPU hotplug related fixes" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/core: Plug potential memory leak in CPU_UP_PREPARE perf/core: Remove the bogus and dangerous CPU_DOWN_FAILED hotplug state perf/core: Remove bogus UP_CANCELED hotplug state perf/x86/amd/uncore: Plug reference leak
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds authored
Pull powerpc fixes from Michael Ellerman: - Fix build error on 32-bit with checkpoint restart from Aneesh Kumar - Fix dedotify for binutils >= 2.26 from Andreas Schwab - Don't trace hcalls on offline CPUs from Denis Kirjanov - eeh: Fix stale cached primary bus from Gavin Shan - eeh: Fix stale PE primary bus from Gavin Shan - mm: Fix Multi hit ERAT cause by recent THP update from Aneesh Kumar K.V - ioda: Set "read" permission when "write" is set from Alexey Kardashevskiy * tag 'powerpc-4.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/ioda: Set "read" permission when "write" is set powerpc/mm: Fix Multi hit ERAT cause by recent THP update powerpc/powernv: Fix stale PE primary bus powerpc/eeh: Fix stale cached primary bus powerpc/pseries: Don't trace hcalls on offline CPUs powerpc: Fix dedotify for binutils >= 2.26 powerpc/book3s_32: Fix build error with checkpoint restart
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git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds authored
Pull dmaengine fixes from Vinod Koul: "A few fixes for drivers, nothing major here. Fixes are: iotdma fix to restart channels, new ID for wildcat PCH, residue fix for edma, disable irq for non-cyclic in dw" * tag 'dmaengine-fix-4.5-rc5' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: dw: disable BLOCK IRQs for non-cyclic xfer dmaengine: edma: fix residue race for cyclic dmaengine: dw: pci: add ID for WildcatPoint PCH dmaengine: IOATDMA: fix timer code that continues to restart channels during idle
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linuxLinus Torvalds authored
Pull clk driver fixes from Stephen Boyd: "An assortment of vendor specific clk drivers fixes, most notably fallout from adding Tegra210 and rockchip rk3036/rk3368 drivers this cycle. There's also the random smattering of sparse/checker fixes, a build "fix" to get the Tango clk driver to compile because the Kconfig symbol was renamed after the fact, and a clk gpio fix for a patch mismerge" * tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (28 commits) clk: gpio: Really allow an optional clock= DT property Revert "clk: qcom: Specify LE device endianness" clk: versatile: mask VCO bits before writing clk: tegra: super: Fix sparse warnings for functions not declared as static clk: tegra: Fix sparse warnings for functions not declared as static clk: tegra: Fix sparse warning for pll_m clk: tegra: Use definition for pll_u override bit clk: tegra: Fix warning caused by pll_u failing to lock clk: tegra: Fix clock sources for Tegra210 EMC clk: tegra: Add the APB2APE audio clock on Tegra210 clk: tegra: Add missing of_node_put() clk: tegra: Fix PLLE SS coefficients clk: tegra: Fix typos around clearing PLLE bits during enable clk: tegra: Do not disable PLLE when under hardware control clk: tegra: Fix pllx dyn step calculation clk: tegra: pll: Fix potential sleeping-while-atomic clk: tegra: Fix the misnaming of nvenc from msenc clk: tegra: Fix naming of MISC registers clk: tango4: rename ARCH_TANGOX to ARCH_TANGO clk: scpi: Fix checking return value of platform_device_register_simple() ...
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull more drm fixes from Dave Airlie: "Some more fixes trickled in: A bunch of VC4 ones since it's a pretty new driver not much chance of regressions, and it fixes GPU resets. Also one atomic fix, one set of fixes for a common bug in TTM cleanup, and one i915 hotplug fix" * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: drm/nouveau: use post-decrement in error handling drm/atomic: Allow for holes in connector state, v2. drm/i915: Fix hpd live status bits for g4x drm/vc4: Use runtime PM to power cycle the device when the GPU hangs. drm/vc4: Enable runtime PM. drm/vc4: Fix spurious GPU resets due to BO reuse. drm/vc4: Drop error message on seqno wait timeouts. drm/vc4: Fix -ERESTARTSYS error return from BO waits. drm/vc4: Return an ERR_PTR from BO creation instead of NULL. drm/vc4: Fix the clear color for the first tile rendered. drm/vc4: Validate that WAIT_BO padding is cleared. drm/radeon: use post-decrement in error handling drm/amdgpu: use post-decrement in error handling
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Simon Guinot authored
In __request_region, if a conflict with a BUSY and MUXED resource is detected, then the caller goes to sleep and waits for the resource to be released. A pointer on the conflicting resource is kept. At wake-up this pointer is used as a parent to retry to request the region. A first problem is that this pointer might well be invalid (if for example the conflicting resource have already been freed). Another problem is that the next call to __request_region() fails to detect a remaining conflict. The previously conflicting resource is passed as a parameter and __request_region() will look for a conflict among the children of this resource and not at the resource itself. It is likely to succeed anyway, even if there is still a conflict. Instead, the parent of the conflicting resource should be passed to __request_region(). As a fix, this patch doesn't update the parent resource pointer in the case we have to wait for a muxed region right after. Reported-and-tested-by:
Vincent Pelletier <plr.vincent@gmail.com> Signed-off-by:
Simon Guinot <simon.guinot@sequanux.org> Tested-by:
Vincent Donnefort <vdonnefort@gmail.com> Cc: stable@kernel.org Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- 19 Feb, 2016 12 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4Linus Torvalds authored
Pull ext4 bugfixes from Ted Ts'o: "Miscellaneous ext4 bug fixes for v4.5" * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: fix crashes in dioread_nolock mode ext4: fix bh->b_state corruption ext4: fix memleak in ext4_readdir() ext4: remove unused parameter "newblock" in convert_initialized_extent() ext4: don't read blocks from disk after extents being swapped ext4: fix potential integer overflow ext4: add a line break for proc mb_groups display ext4: ioctl: fix erroneous return value ext4: fix scheduling in atomic on group checksum failure ext4 crypto: move context consistency check to ext4_file_open() ext4 crypto: revalidate dentry after adding or removing the key
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git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfsLinus Torvalds authored
Pull btrfs fix from Chris Mason: "My for-linus-4.5 branch has a btrfs DIO error passing fix. I know how much you love DIO, so I'm going to suggest against reading it. We'll follow up with a patch to drop the error arg from dio_end_io in the next merge window." * 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: fix direct IO requests not reporting IO error to user space
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Linus Torvalds authored
Merge fixes from Andrew Morton: "10 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm: slab: free kmem_cache_node after destroy sysfs file ipc/shm: handle removed segments gracefully in shm_mmap() MAINTAINERS: update Kselftest Framework mailing list devm_memremap_release(): fix memremap'd addr handling mm/hugetlb.c: fix incorrect proc nr_hugepages value mm, x86: fix pte_page() crash in gup_pte_range() fsnotify: turn fsnotify reaper thread into a workqueue job Revert "fsnotify: destroy marks with call_srcu instead of dedicated thread" mm: fix regression in remap_file_pages() emulation thp, dax: do not try to withdraw pgtable from non-anon VMA
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fixes from Will Deacon: "Here are some more arm64 fixes for 4.5. This has mostly come from Yang Shi, who saw some issues under -rt that also affect mainline. The rest of it is pretty small, but still worth having. We've got an old issue outstanding with valid_user_regs which will likely wait until 4.6 (since it would really benefit from some time in -next) and another issue with kasan and idle which should be fixed next week. Apart from that, pretty quiet here (and still no sign of the THP issue reported on s390...) Summary: - Allow EFI stub to use strnlen(), which is required by recent libfdt - Avoid smp_processor_id() in preempt context during unwinding - Avoid false Kasan warnings during unwinding - Ensure early devices are picked up by the IOMMU DMA ops - Avoid rebuilding the kernel for the 'install' target - Run fixup handlers for alignment faults on userspace access" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: mm: allow the kernel to handle alignment faults on user accesses arm64: kbuild: make "make install" not depend on vmlinux arm64: dma-mapping: fix handling of devices registered before arch_initcall arm64/efi: Make strnlen() available to the EFI namespace arm/arm64: crypto: assure that ECB modes don't require an IV arm64: make irq_stack_ptr more robust arm64: debug: re-enable irqs before sending breakpoint SIGTRAP arm64: disable kasan when accessing frame->fp in unwind_frame
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linuxLinus Torvalds authored
Pull s390 fixes from Martin Schwidefsky: "Several bug fixes: - There are four different stack tracers, and three of them have bugs. For 4.5 the bugs are fixed and we prepare a cleanup patch for the next merge window. - Three bug fixes for the dasd driver in regard to parallel access volumes and the new max_dev_sectors block device queue limit - The irq restore optimization needs a fixup for memcpy_real - The diagnose trace code has a conflict with lockdep" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/dasd: fix performance drop s390/maccess: reduce stnsm instructions s390/diag: avoid lockdep recursion s390/dasd: fix refcount for PAV reassignment s390/dasd: prevent incorrect length error under z/VM after PAV changes s390: fix DAT off memory access, e.g. on kdump s390/oprofile: fix address range for asynchronous stack s390/perf_event: fix address range for asynchronous stack s390/stacktrace: add save_stack_trace_regs() s390/stacktrace: save full stack traces s390/stacktrace: add missing end marker s390/stacktrace: fix address ranges for asynchronous and panic stack s390/stacktrace: fix save_stack_trace_tsk() for current task -
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrlLinus Torvalds authored
Pull Pin control fixes from Linus Walleij: "Pin control fixes for the v4.5 series, all are individual driver fixes: - Fix the PXA2xx driver to export its init function so we do not break modular compiles. - Hide unused functions in the Nomadik driver. - Fix up direction control in the Mediatek driver. - Toggle the sunxi GPIO lines to input when you read them on the H3 GPIO controller, lest you only get garbage. - Fix up the number of settings in the MVEBU driver. - Fix a serious SMP race condition in the Samsung driver" * tag 'pinctrl-v4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: pinctrl: samsung: fix SMP race condition pinctrl: mvebu: fix num_settings in mpp group assignment pinctrl: sunxi: H3 requires irq_read_needs_mux pinctrl: mediatek: fix direction control issue pinctrl: nomadik: hide unused functions pinctrl: pxa: export pxa2xx_pinctrl_init() -
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull sound fixes from Takashi Iwai: "This update contains again a few more fixes for ALSA core stuff although it's no longer high flux: two race fixes in sequencer and one PCM race fix for non-atomic PCM ops. In addition, HD-audio gained a similar fix for race at reloading the driver" * tag 'sound-4.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: pcm: Fix rwsem deadlock for non-atomic PCM stream ALSA: seq: Fix double port list deletion ALSA: hda - Cancel probe work instead of flush at remove ALSA: seq: Fix leak of pool buffer at concurrent writes
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EunTaik Lee authored
Although we don't expect to take alignment faults on access to normal memory, misbehaving (i.e. buggy) user code can pass MMIO pointers into system calls, leading to things like get_user accessing device memory. Rather than OOPS the kernel, allow any exception fixups to run and return something like -EFAULT back to userspace. This makes the behaviour more consistent with userspace, even though applications with access to device mappings can easily cause other issues if they try hard enough. Acked-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
Eun Taik Lee <eun.taik.lee@samsung.com> [will: dropped __kprobes annotation and rewrote commit mesage] Signed-off-by:
Will Deacon <will.deacon@arm.com>
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Masahiro Yamada authored
For the same reason as commit 19514fc6 ("arm, kbuild: make "make install" not depend on vmlinux"), the install targets should never trigger the rebuild of the kernel. Signed-off-by:
Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by:
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Jan Kara authored
Competing overwrite DIO in dioread_nolock mode will just overwrite pointer to io_end in the inode. This may result in data corruption or extent conversion happening from IO completion interrupt because we don't properly set buffer_defer_completion() when unlocked DIO races with locked DIO to unwritten extent. Since unlocked DIO doesn't need io_end for anything, just avoid allocating it and corrupting pointer from inode for locked DIO. A cleaner fix would be to avoid these games with io_end pointer from the inode but that requires more intrusive changes so we leave that for later. Cc: stable@vger.kernel.org Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Theodore Ts'o <tytso@mit.edu>
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Jan Kara authored
ext4 can update bh->b_state non-atomically in _ext4_get_block() and ext4_da_get_block_prep(). Usually this is fine since bh is just a temporary storage for mapping information on stack but in some cases it can be fully living bh attached to a page. In such case non-atomic update of bh->b_state can race with an atomic update which then gets lost. Usually when we are mapping bh and thus updating bh->b_state non-atomically, nobody else touches the bh and so things work out fine but there is one case to especially worry about: ext4_finish_bio() uses BH_Uptodate_Lock on the first bh in the page to synchronize handling of PageWriteback state. So when blocksize < pagesize, we can be atomically modifying bh->b_state of a buffer that actually isn't under IO and thus can race e.g. with delalloc trying to map that buffer. The result is that we can mistakenly set / clear BH_Uptodate_Lock bit resulting in the corruption of PageWriteback state or missed unlock of BH_Uptodate_Lock. Fix the problem by always updating bh->b_state bits atomically. CC: stable@vger.kernel.org Reported-by:
Nikolay Borisov <kernel@kyup.com> Signed-off-by:
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Rasmus Villemoes authored
We need to use post-decrement to get the dma_map_page undone also for i==0, and to avoid some very unpleasant behaviour if dma_map_page failed already at i==0. Signed-off-by:
Rasmus Villemoes <linux@rasmusvillemoes.dk> Reviewed-by:
Ben Skeggs <bskeggs@redhat.com> Signed-off-by:
Dave Airlie <airlied@redhat.com>
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