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2019-05-10parisc: Use __ro_after_init in cache.cHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-10parisc: Enable the ro_after_init featureHelge Deller
This patch modifies the initial page mapping functions in the following way: During bootup the init, text and data pages will be mapped RWX and if supported, with huge pages. At final stage of the bootup, the kernel calls free_initmem() and then all pages will be remapped either R-X (for text and read-only data) or RW- (for data). The __init pages will be dropped. This reflects the behaviour of the x86 platform. Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-10parisc: Drop LDCW barrier in CAS code when running UPHelge Deller
When running an SMP kernel on a single-CPU machine, we can speed up the CAS code by replacing the LDCW sync barrier with NOP. Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-06parisc: Add static branch and JUMP_LABEL featureHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-06parisc: Use PA_ASM_LEVEL in boot codeHelge Deller
The LEVEL define clashed with the DRBD code. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v4.14+
2019-05-06parisc: Rename LEVEL to PA_ASM_LEVEL to avoid name clash with DRBD codeHelge Deller
LEVEL is a very common word, and now after many years it suddenly clashed with another LEVEL define in the DRBD code. Rename it to PA_ASM_LEVEL instead. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org>
2019-05-03parisc: Update huge TLB page support to use per-pagetable spinlockJohn David Anglin
This patch updates the parisc huge TLB page support to use per-pagetable spinlocks. This patch requires Mikulas' per-pagetable spinlock patch and the revised TLB serialization patch from Helge and myself. With Mikulas' patch, we need to use the per-pagetable spinlock for page table updates. The TLB lock is only used to serialize TLB flushes on machines with the Merced bus. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Use per-pagetable spinlockMikulas Patocka
PA-RISC uses a global spinlock to protect pagetable updates in the TLB fault handlers. When multiple cores are taking TLB faults simultaneously, the cache line containing the spinlock becomes a bottleneck. This patch embeds the spinlock in the top level page directory, so that every process has its own lock. It improves performance by 30% when doing parallel compilations. At least on the N class systems, only one PxTLB inter processor broadcast can be active at any one time on the Merced bus. If a Merced bus is found, this patch serializes the TLB flushes with the pa_tlb_flush_lock spinlock. v1: Initial patch by Mikulas v2: Added Merced detection by Helge v3: Revised TLB serialization by Dave & Helge Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Allow live-patching of __meminit functionsHelge Deller
When making the text sections writeable with set_kernel_text_rw(1), include all text sections including those in the __init section. Otherwise functions marked with __meminit will stay read-only. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 4.20+
2019-05-03parisc: Add memory barrier to asm pdc and sync instructionsHelge Deller
Add compiler memory barriers to ensure the compiler doesn't reorder memory operations around these instructions. Cc: stable@vger.kernel.org # v4.20+ Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure") Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Add memory clobber to TLB purgesJohn David Anglin
The pdtlb and pitlb instructions are strongly ordered. The asms invoking these instructions should be compiler memory barriers to ensure the compiler doesn't reorder memory operations around these instructions. Signed-off-by: John David Anglin <dave.anglin@bell.net> CC: stable@vger.kernel.org # v4.20+ Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure") Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Use ldcw instruction for SMP spinlock release barrierJohn David Anglin
There are only a couple of instructions that can function as a memory barrier on parisc. Currently, we use the sync instruction as a memory barrier when releasing a spinlock. However, the ldcw instruction is a better barrier when we have a handy memory location since it operates in the cache on coherent machines. This patch updates the spinlock release code to use ldcw. I also changed the "stw,ma" instructions to "stw" instructions as it is not an adequate barrier. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Remove lock code to serialize TLB operations in pacache.SJohn David Anglin
TLB operations only need to be serialized on machines with the Merced (Stretch) bus. The only machines in this category are L and N class, and they require a 64-bit PA 2.0 kernel. On these machines, we use local TLB purges in the tmpalias routines. We don't need to serialize TLB purges on all other machines. Thus, the lock/unlock code can be removed when CONFIG_PA20 is not defined. Further, when CONFIG_PA20 is not defined, alternative patching converts the TLB purges to local purges when PA 2.0 hardware has been detected. Signed-off-by: John David Anglin <dave.anglin@bell.net> Tested-By: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Switch from DISCONTIGMEM to SPARSEMEMHelge Deller
The commit 1c30844d2dfe ("mm: reclaim small amounts of memory when an external fragmentation event occurs") breaks memory management on a parisc c8000 workstation with this memory layout: 0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB 1) Start 0x0000000100000000 End 0x00000001bfdfffff Size 3070 MB 2) Start 0x0000004040000000 End 0x00000040ffffffff Size 3072 MB With the patch 1c30844d2dfe, the kernel will incorrectly reclaim the first zone when it fills up, ignoring the fact that there are two completely free zones. Basiscally, it limits cache size to 1GiB. The parisc kernel is currently using the DISCONTIGMEM implementation, but isn't NUMA. Avoid this issue or strange work-arounds by switching to the more commonly used SPARSEMEM implementation. Reported-by: Mikulas Patocka <mpatocka@redhat.com> Fixes: 1c30844d2dfe ("mm: reclaim small amounts of memory when an external fragmentation event occurs") Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: enable wide mode earlySven Schnelle
The idle task might have been allocated above 4GB. With the current code we cannot access that memory because the CPU is still running in narrow mode. This was found on a J5000 machine and the patch is required to enable SPARSEMEM on that machine. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: update feature listsSven Schnelle
Update lists to reflect that we have now KGDB and kretprobes support. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Show n/a if product number not availableHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: remove unused flags parameter in __patch_text()Sven Schnelle
It's not used by patch_map()/patch_unmap(), so lets remove it. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03doc: update kprobes supported architecture listSven Schnelle
Now that kprobes and kretprobes are implemented, update the list in Documentation to reflect that. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Implement kretprobesSven Schnelle
Implement kretprobes on parisc, parts stolen from powerpc. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: remove kprobes.h from generic-ySven Schnelle
We're providing our own version now. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Implement kprobesSven Schnelle
Implement kprobes support for PA-RISC. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: add functions required by KPROBE_EVENTSSven Schnelle
implement regs_get_register(), regs_get_kernel_stack_nth() and regs_within_kernel_stack() Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: PA-Linux requires at least 32 MB RAMHelge Deller
Even a 32-bit kernel requires at least 27 MB to decompress itself, so halt the system with a message if the system has less memory than 32 MB. Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Skip registering LED when running in QEMUHelge Deller
No need to spend CPU cycles when we run on QEMU. Signed-off-by: Helge Deller <deller@gmx.de> CC: stable@vger.kernel.org # v4.9+
2019-05-03parisc: Tune LASI LAN for QEMUHelge Deller
Do not loose cycles when we run on QEMU, and fix one trivial typo. Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Export running_on_qemu symbol for modulesHelge Deller
Signed-off-by: Helge Deller <deller@gmx.de> CC: stable@vger.kernel.org # v4.9+
2019-05-03parisc: add KGDB supportSven Schnelle
This patch add KGDB support to PA-RISC. It also implements single-stepping utilizing the recovery counter. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: add parisc code patchingSven Schnelle
Instead of re-mapping the whole kernel text with RWX rights add a patch_text() which can be used to replace instructions in the kernel .text section. Based on the ARM implementation. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: add set_fixmap()/clear_fixmap()Sven Schnelle
These functions will be used for adding code patching functions later. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-05-03parisc: Consider stack randomization for mmap base only when necessaryAlexandre Ghiti
Do not offset mmap base address because of stack randomization if current task does not want randomization. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Signed-off-by: Helge Deller <deller@gmx.de>
2019-04-28Linux 5.1-rc7v5.1-rc7Linus Torvalds
2019-04-28Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-armLinus Torvalds
Pull ARM fixes from Russell King: "A small number of ARM fixes - Fix function tracer and unwinder dependencies so that we don't end up building kernels that will crash - Fix ARMv7M nommu initialisation (missing register initialisation) - Fix EFI decompressor entry (ensuring barrier instructions are enabled prior to use)" * tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: ARM: 8857/1: efi: enable CP15 DMB instructions before cleaning the cache ARM: 8856/1: NOMMU: Fix CCR register faulty initialization when MPU is disabled ARM: fix function graph tracer and unwinder dependencies
2019-04-28Merge tag 'powerpc-5.1-6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc fixes from Michael Ellerman: "A one-liner to make our Radix MMU support depend on HUGETLB_PAGE. We use some of the hugetlb inlines (eg. pud_huge()) when operating on the linear mapping and if they're compiled into empty wrappers we can corrupt memory. Then two fixes to our VFIO IOMMU code. The first is not a regression but fixes the locking to avoid a user-triggerable deadlock. The second does fix a regression since rc1, and depends on the first fix. It makes it possible to run guests with large amounts of memory again (~256GB). Thanks to Alexey Kardashevskiy" * tag 'powerpc-5.1-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/mm_iommu: Allow pinning large regions powerpc/mm_iommu: Fix potential deadlock powerpc/mm/radix: Make Radix require HUGETLB_PAGE
2019-04-28Merge tag 'for-linus-20190428' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block fixes from Jens Axboe: "A set of io_uring fixes that should go into this release. In particular, this contains: - The mutex lock vs ctx ref count fix (me) - Removal of a dead variable (me) - Two race fixes (Stefan) - Ring head/tail condition fix for poll full SQ detection (Stefan)" * tag 'for-linus-20190428' of git://git.kernel.dk/linux-block: io_uring: remove 'state' argument from io_{read,write} path io_uring: fix poll full SQ detection io_uring: fix race condition when sq threads goes sleeping io_uring: fix race condition reading SQ entries io_uring: fail io_uring_register(2) on a dying io_uring instance
2019-04-28Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdmaLinus Torvalds
Pull rdma fixes from Jason Gunthorpe: "One core bug fix and a few driver ones - FRWR memory registration for hfi1/qib didn't work with with some iovas causing a NFSoRDMA failure regression due to a fix in the NFS side - A command flow error in mlx5 allowed user space to send a corrupt command (and also smash the kernel stack we've since learned) - Fix a regression and some bugs with device hot unplug that was discovered while reviewing Andrea's patches - hns has a failure if the user asks for certain QP configurations" * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: RDMA/hns: Bugfix for mapping user db RDMA/ucontext: Fix regression with disassociate RDMA/mlx5: Use rdma_user_map_io for mapping BAR pages RDMA/mlx5: Do not allow the user to write to the clock page IB/mlx5: Fix scatter to CQE in DCT QP creation IB/rdmavt: Fix frwr memory registration
2019-04-28Merge tag 'dmaengine-fix-5.1-rc7' of ↵Linus Torvalds
git://git.infradead.org/users/vkoul/slave-dma Pull dmaengine fixes from Vinod Koul: - fix for wrong register use in mediatek driver - fix in sh driver for glitch is tx_status and treating 0 a valid residue for cyclic - fix in bcm driver for using right memory allocation flag * tag 'dmaengine-fix-5.1-rc7' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: mediatek-cqdma: fix wrong register usage in mtk_cqdma_start dmaengine: sh: rcar-dmac: Fix glitch in dmaengine_tx_status dmaengine: sh: rcar-dmac: With cyclic DMA residue 0 is valid dmaengine: bcm2835: Avoid GFP_KERNEL in device_prep_slave_sg
2019-04-27Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input Pull input fixes from Dmitry Torokhov: "Just a couple of fixups for Synaptics RMI4 driver and allowing snvs_pwrkey to be selected on more boards" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: synaptics-rmi4 - write config register values to the right offset Input: synaptics-rmi4 - fix possible double free Input: snvs_pwrkey - make it depend on ARCH_MXC
2019-04-27Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Ingo Molnar: - Fix an early boot crash in the RSDP parsing code by effectively turning off the parsing call - we ran out of time but want to fix the regression. The more involved fix is being worked on. - Fix a crash that can trigger in the kmemlek code. * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Fix a crash with kmemleak_scan() x86/boot: Disable RSDP parsing temporarily
2019-04-27Merge branch 'sched-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler fix from Ingo Molnar: "Fix a division by zero bug that can trigger in the NUMA placement code" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/numa: Fix a possible divide-by-zero
2019-04-27Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fix from Ingo Molnar: "A cstate event enumeration fix for Kaby/Coffee Lake CPUs" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel: Update KBL Package C-state events to also include PC8/PC9/PC10 counters
2019-04-26slip: make slhc_free() silently accept an error pointerLinus Torvalds
This way, slhc_free() accepts what slhc_init() returns, whether that is an error or not. In particular, the pattern in sl_alloc_bufs() is slcomp = slhc_init(16, 16); ... slhc_free(slcomp); for the error handling path, and rather than complicate that code, just make it ok to always free what was returned by the init function. That's what the code used to do before commit 4ab42d78e37a ("ppp, slip: Validate VJ compression slot parameters completely") when slhc_init() just returned NULL for the error case, with no actual indication of the details of the error. Reported-by: syzbot+45474c076a4927533d2e@syzkaller.appspotmail.com Fixes: 4ab42d78e37a ("ppp, slip: Validate VJ compression slot parameters completely") Acked-by: Ben Hutchings <ben@decadent.org.uk> Cc: David Miller <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-04-26Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge misc fixes from Andrew Morton: "9 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: fs/proc/proc_sysctl.c: Fix a NULL pointer dereference mm/page_alloc.c: fix never set ALLOC_NOFRAGMENT flag mm/page_alloc.c: avoid potential NULL pointer dereference mm, page_alloc: always use a captured page regardless of compaction result mm: do not boost watermarks to avoid fragmentation for the DISCONTIG memory model lib/test_vmalloc.c: do not create cpumask_t variable on stack lib/Kconfig.debug: fix build error without CONFIG_BLOCK zram: pass down the bvec we need to read into in the work struct mm/memory_hotplug.c: drop memory device reference after find_memory_block()
2019-04-26Input: synaptics-rmi4 - write config register values to the right offsetLucas Stach
Currently any changed config register values don't take effect, as the function to write them back is called with the wrong register offset. Fixes: ff8f83708b3e (Input: synaptics-rmi4 - add support for 2D sensors and F11) Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2019-04-26Merge tag 'arm64-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 fixes from Catalin Marinas: - keep the tail of an unaligned initrd reserved - adjust ftrace_make_call() to deal with the relative nature of PLTs * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64/module: ftrace: deal with place relative nature of PLTs arm64: mm: Ensure tail of unaligned initrd is reserved
2019-04-26Merge tag 'trace-v5.1-rc6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: "Three tracing fixes: - Use "nosteal" for ring buffer splice pages - Memory leak fix in error path of trace_pid_write() - Fix preempt_enable_no_resched() (use preempt_enable()) in ring buffer code" * tag 'trace-v5.1-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: trace: Fix preempt_enable_no_resched() abuse tracing: Fix a memory leak by early error exit in trace_pid_write() tracing: Fix buffer_ref pipe ops
2019-04-26Merge tag 'gpio-v5.1-3' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio Pull GPIO fixes from Linus Walleij: "Not much to say about them, regular fixes: - Fix a bug on the errorpath of gpiochip_add_data_with_key() - IRQ type setting on the spreadtrum GPIO driver" * tag 'gpio-v5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: gpio: Fix gpiochip_add_data_with_key() error path gpio: eic: sprd: Fix incorrect irq type setting for the sync EIC
2019-04-26Merge tag 'drm-fixes-2019-04-26' of git://anongit.freedesktop.org/drm/drmLinus Torvalds
Pull drm fixes from Dave Airlie: "Regular drm fixes, nothing too outstanding, I'm guessing Easter was slowing people down. i915: - FEC enable fix - BXT display lanes fix ttm: - fix reinit for reloading drivers regression imx: - DP CSC fix sun4i: - module unload/load fix vc4: - memory leak fix - compile fix dw-hdmi: - rockchip scdc overflow fix sched: - docs fix vmwgfx: - dma api layering fix" * tag 'drm-fixes-2019-04-26' of git://anongit.freedesktop.org/drm/drm: drm/bridge: dw-hdmi: fix SCDC configuration for ddc-i2c-bus drm/vmwgfx: Fix dma API layer violation drm/vc4: Fix compilation error reported by kbuild test bot drm/sun4i: Unbind components before releasing DRM and memory drm/vc4: Fix memory leak during gpu reset. drm/sched: Fix description of drm_sched_stop drm/imx: don't skip DP channel disable for background plane gpu: ipu-v3: dp: fix CSC handling drm/ttm: fix re-init of global structures drm/sun4i: Fix component unbinding and component master deletion drm/sun4i: Set device driver data at bind time for use in unbind drm/sun4i: Add missing drm_atomic_helper_shutdown at driver unbind drm/i915: Restore correct bxt_ddi_phy_calc_lane_lat_optim_mask() calculation drm/i915: Do not enable FEC without DSC drm: bridge: dw-hdmi: Fix overflow workaround for Rockchip SoCs
2019-04-26Merge tag 'for-5.1-rc6-tag' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux Pull btrfs fix from David Sterba: "One patch to fix a crash in io submission path, due to memory allocation errors. In short, the multipage bio work that landed in 5.1 caused larger bios that in turn require larger temporary memory for checksums. The patch is a workaround, we're going to rework the allocation so it does not require the vmalloc fallback. It took a while to identify that it's caused by patches in 5.1 and not a patchset that did some changes in error handling in the code. I've tested it on various memory/cpu combinations, it could hit OOM but does not crash. The timestamp of the patch is less than a day due to updates in the changelog, tests were running meanwhile" * tag 'for-5.1-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: Switch memory allocations in async csum calculation path to kvmalloc
2019-04-26Merge tag '5.1-rc6-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6Linus Torvalds
Pull cifs fixes from Steve French: "Three small SMB3 fixes (all for stable as well): two leaks and a rename bug" * tag '5.1-rc6-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6: cifs: fix page reference leak with readv/writev cifs: do not attempt cifs operation on smb2+ rename error cifs: fix memory leak in SMB2_read
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