1. 13 Nov, 2019 11 commits
    • Viktor Rosendahl (BMW)'s avatar
      ftrace: Implement fs notification for tracing_max_latency · 91edde2e
      Viktor Rosendahl (BMW) authored
      This patch implements the feature that the tracing_max_latency file,
      e.g. /sys/kernel/debug/tracing/tracing_max_latency will receive
      notifications through the fsnotify framework when a new latency is
      available.
      
      One particularly interesting use of this facility is when enabling
      threshold tracing, through /sys/kernel/debug/tracing/tracing_thresh,
      together with the preempt/irqsoff tracers. This makes it possible to
      implement a user space program that can, with equal probability,
      obtain traces of latencies that occur immediately after each other in
      spite of the fact that the preempt/irqsoff tracers operate in overwrite
      mode.
      
      This facility works with the hwlat, preempt/irqsoff, and wakeup
      tracers.
      
      The tracers may call the latency_fsnotify() from places such as
      __schedule() or do_idle(); this makes it impossible to call
      queue_work() directly without risking a deadlock. The same would
      happen with a softirq,  kernel thread or tasklet. For this reason we
      use the irq_work mechanism to call queue_work().
      
      This patch creates a new workqueue. The reason for doing this is that
      I wanted to use the WQ_UNBOUND and WQ_HIGHPRI flags.  My thinking was
      that WQ_UNBOUND might help with the latency in some important cases.
      
      If we use:
      
      queue_work(system_highpri_wq, &tr->fsnotify_work);
      
      then the work will (almost) always execute on the same CPU but if we are
      unlucky that CPU could be too busy while there could be another CPU in
      the system that would be able to process the work soon enough.
      
      queue_work_on() could be used to queue the work on another CPU but it
      seems difficult to select the right CPU.
      
      Link: http://lkml.kernel.org/r/20191008220824.7911-2-viktor.rosendahl@gmail.comReviewed-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
      Signed-off-by: default avatarViktor Rosendahl (BMW) <viktor.rosendahl@gmail.com>
      [ Added max() to have one compare for max latency ]
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      91edde2e
    • Steven Rostedt (VMware)'s avatar
      ftrace: Add information on number of page groups allocated · da537f0a
      Steven Rostedt (VMware) authored
      Looking for ways to shrink the size of the dyn_ftrace structure, knowing the
      information about how many pages and the number of groups of those pages, is
      useful in working out the best ways to save on memory.
      
      This adds one info print on how many groups of pages were used to allocate
      the ftrace dyn_ftrace structures, and also shows the number of pages and
      groups in the dyn_ftrace_total_info (which is used for debugging).
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      da537f0a
    • Josh Poimboeuf's avatar
      ftrace/x86: Tell objtool to ignore nondeterministic ftrace stack layout · 77ac117b
      Josh Poimboeuf authored
      Objtool complains about the new ftrace direct trampoline code:
      
        arch/x86/kernel/ftrace_64.o: warning: objtool: ftrace_regs_caller()+0x190: stack state mismatch: cfa1=7+16 cfa2=7+24
      
      Typically, code has a deterministic stack layout, such that at a given
      instruction address, the stack frame size is always the same.
      
      That's not the case for the new ftrace_regs_caller() code after it
      adjusts the stack for the direct case.  Just plead ignorance and assume
      it's always the non-direct path.  Note this creates a tiny window for
      ORC to get confused.
      
      Link: http://lkml.kernel.org/r/20191108225100.ea3bhsbdf6oerj6g@trebleReported-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      77ac117b
    • Steven Rostedt (VMware)'s avatar
      ftrace/x86: Add a counter to test function_graph with direct · a3ad1a7e
      Steven Rostedt (VMware) authored
      As testing for direct calls from the function graph tracer adds a little
      overhead (which is a lot when tracing every function), add a counter that
      can be used to test if function_graph tracer needs to test for a direct
      caller or not.
      
      It would have been nicer if we could use a static branch, but the static
      branch logic fails when used within the function graph tracer trampoline.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      a3ad1a7e
    • Steven Rostedt (VMware)'s avatar
      ftrace/x86: Add register_ftrace_direct() for custom trampolines · 562955fe
      Steven Rostedt (VMware) authored
      Enable x86 to allow for register_ftrace_direct(), where a custom trampoline
      may be called directly from an ftrace mcount/fentry location.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      562955fe
    • Steven Rostedt (VMware)'s avatar
      ftrace/selftests: Update the direct call selftests to test two direct calls · ed9dafeb
      Steven Rostedt (VMware) authored
      The register_ftrace_direct() takes a different path if there's already a
      direct call registered, but this was not tested in the self tests. Now that
      there's a second direct caller test module, we can use this to test not only
      one direct caller, but two.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      ed9dafeb
    • Steven Rostedt (VMware)'s avatar
      ftrace: Add another example of register_ftrace_direct() use case · 156473a0
      Steven Rostedt (VMware) authored
      Add another module sample that registers a direct trampoline to a function
      via register_ftrace_direct(). Having another module that does this allows to
      test the use case of multiple direct callers registered, as more than one
      direct caller goes into another path, and is needed to perform proper
      testing of the register_ftrace_direct() call.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      156473a0
    • Steven Rostedt (VMware)'s avatar
      ftrace/selftest: Add tests to test register_ftrace_direct() · 646f01cc
      Steven Rostedt (VMware) authored
      Add two test cases that test the new ftrace direct functionality if the
      ftrace-direct sample module is available. One test case tests against each
      available tracer (function, function_graph, mmiotrace, etc), and the other
      test tests against a kprobe at the same location as the direct caller. Both
      tests follow the same pattern of testing combinations:
      
        enable test (either the tracer or the kprobe)
        load direct function module
        unload direct function module
        disable test
      
        enable test
        load direct function module
        disable test
        unload direct function module
      
        load direct function module
        enable test
        disable test
        unload direct function module
      
        load direct function module
        enable test
        unload direct function module
        disable test
      
      As most the bugs in development happened with various ways of enabling or
      disabling the direct calls with function tracer in one of these
      combinations.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      646f01cc
    • Steven Rostedt (VMware)'s avatar
      ftrace: Add sample module that uses register_ftrace_direct() · b06457c8
      Steven Rostedt (VMware) authored
      Add a sample module that shows a simple use case for
      regsiter_ftrace_direct(), and how to use it.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      b06457c8
    • Steven Rostedt (VMware)'s avatar
      ftrace: Add ftrace_find_direct_func() · 013bf0da
      Steven Rostedt (VMware) authored
      As function_graph tracer modifies the return address to insert a trampoline
      to trace the return of a function, it must be aware of a direct caller, as
      when it gets called, the function's return address may not be at on the
      stack where it expects. It may have to see if that return address points to
      the a direct caller and adjust if it is.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      013bf0da
    • Steven Rostedt (VMware)'s avatar
      ftrace: Add register_ftrace_direct() · 763e34e7
      Steven Rostedt (VMware) authored
      Add the start of the functionality to allow other trampolines to use the
      ftrace mcount/fentry/nop location. This adds two new functions:
      
       register_ftrace_direct() and unregister_ftrace_direct()
      
      Both take two parameters: the first is the instruction address of where the
      mcount/fentry/nop exists, and the second is the trampoline to have that
      location called.
      
      This will handle cases where ftrace is already used on that same location,
      and will make it still work, where the registered direct called trampoline
      will get called after all the registered ftrace callers are handled.
      
      Currently, it will not allow for IP_MODIFY functions to be called at the
      same locations, which include some kprobes and live kernel patching.
      
      At this point, no architecture supports this. This is only the start of
      implementing the framework.
      Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
      763e34e7
  2. 08 Nov, 2019 2 commits
  3. 04 Nov, 2019 3 commits
  4. 03 Nov, 2019 2 commits
    • Linus Torvalds's avatar
      Linux 5.4-rc6 · a99d8080
      Linus Torvalds authored
      a99d8080
    • Linus Torvalds's avatar
      Merge tag 'usb-5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · 3a69c9e5
      Linus Torvalds authored
      Pull USB fixes from Greg KH:
       "The USB sub-maintainers woke up this past week and sent a bunch of
        tiny fixes. Here are a lot of small patches that that resolve a bunch
        of reported issues in the USB core, drivers, serial drivers, gadget
        drivers, and of course, xhci :)
      
        All of these have been in linux-next with no reported issues"
      
      * tag 'usb-5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (31 commits)
        usb: dwc3: gadget: fix race when disabling ep with cancelled xfers
        usb: cdns3: gadget: Fix g_audio use case when connected to Super-Speed host
        usb: cdns3: gadget: reset EP_CLAIMED flag while unloading
        USB: serial: whiteheat: fix line-speed endianness
        USB: serial: whiteheat: fix potential slab corruption
        USB: gadget: Reject endpoints with 0 maxpacket value
        UAS: Revert commit 3ae62a42 ("UAS: fix alignment of scatter/gather segments")
        usb-storage: Revert commit 747668db ("usb-storage: Set virt_boundary_mask to avoid SG overflows")
        usbip: Fix free of unallocated memory in vhci tx
        usbip: tools: Fix read_usb_vudc_device() error path handling
        usb: xhci: fix __le32/__le64 accessors in debugfs code
        usb: xhci: fix Immediate Data Transfer endianness
        xhci: Fix use-after-free regression in xhci clear hub TT implementation
        USB: ldusb: fix control-message timeout
        USB: ldusb: use unsigned size format specifiers
        USB: ldusb: fix ring-buffer locking
        USB: Skip endpoints with 0 maxpacket length
        usb: cdns3: gadget: Don't manage pullups
        usb: dwc3: remove the call trace of USBx_GFLADJ
        usb: gadget: configfs: fix concurrent issue between composite APIs
        ...
      3a69c9e5
  5. 02 Nov, 2019 10 commits
    • Linus Torvalds's avatar
      Merge tag '5.4-rc6-smb3-fix' of git://git.samba.org/sfrench/cifs-2.6 · 56cfd250
      Linus Torvalds authored
      Pull cifs fix from Steve French:
       "A small smb3 memleak fix"
      
      * tag '5.4-rc6-smb3-fix' of git://git.samba.org/sfrench/cifs-2.6:
        fix memory leak in large read decrypt offload
      56cfd250
    • Linus Torvalds's avatar
      Merge tag 'hwmon-for-v5.4-rc6' of... · 9d234505
      Linus Torvalds authored
      Merge tag 'hwmon-for-v5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
      
      Pull hwmon fixes from Guenter Roeck:
      
       - Fix read timeout problem in ina3221 driver
      
       - Fix wrong bitmask in nct7904 driver
      
      * tag 'hwmon-for-v5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
        hwmon: (ina3221) Fix read timeout issue
        hwmon: (nct7904) Fix the incorrect value of vsen_mask & tcpu_mask & temp_mode in nct7904_data struct.
      9d234505
    • Linus Torvalds's avatar
      Merge tag 'pwm/for-5.4-rc6' of... · e935842a
      Linus Torvalds authored
      Merge tag 'pwm/for-5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
      
      Pull pwm fixes from Thierry Reding:
       "It turned out that relying solely on drivers storing all the PWM state
        in hardware was a little premature and causes a number of subtle (and
        some not so subtle) regressions. Revert the offending patch for now"
      
      * tag 'pwm/for-5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
        Revert "pwm: Let pwm_get_state() return the last implemented state"
      e935842a
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · f83e148a
      Linus Torvalds authored
      Pull SCSI fixes from James Bottomley:
       "Nine changes, eight in drivers [ufs, target, lpfc x 2, qla2xxx x 4]
        and one core change in sd that fixes an I/O failure on DIF type 3
        devices"
      
      * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        scsi: qla2xxx: stop timer in shutdown path
        scsi: sd: define variable dif as unsigned int instead of bool
        scsi: target: cxgbit: Fix cxgbit_fw4_ack()
        scsi: qla2xxx: Fix partial flash write of MBI
        scsi: qla2xxx: Initialized mailbox to prevent driver load failure
        scsi: lpfc: Honor module parameter lpfc_use_adisc
        scsi: ufs-bsg: Wake the device before sending raw upiu commands
        scsi: lpfc: Check queue pointer before use
        scsi: qla2xxx: fixup incorrect usage of host_byte
      f83e148a
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 8194c28e
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Our recent cleanup of EEH led to an oops on bare metal machines when
        the cxl (CAPI) driver creates virtual devices for an attached FPGA
        accelerator.
      
        The "secure virtual machine" support we added in v5.4 had a bug if the
        kernel was relocated (moved during boot), in those cases the signature
        of the kernel text wouldn't verify and the Ultravisor would refuse to
        run the VM.
      
        A recent change to disable interrupts before calling
        arch_cpu_idle_dead() caused a WARN_ON() in our bare metal CPU offline
        code to always trigger.
      
        The KUAP (SMAP) support we added for 32-bit Book3S had a bug if the
        address range crossed a segment (256MB) boundary which could lead to
        spurious faults.
      
        Thanks to: Christophe Leroy, Frederic Barrat, Michael Anderson,
        Nicholas Piggin, Sam Bobroff, Thiago Jung Bauermann"
      
      * tag 'powerpc-5.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/powernv: Fix CPU idle to be called with IRQs disabled
        powerpc/prom_init: Undo relocation before entering secure mode
        powerpc/powernv/eeh: Fix oops when probing cxl devices
        powerpc/32s: fix allow/prevent_user_access() when crossing segment boundaries.
      8194c28e
    • Linus Torvalds's avatar
      Merge tag 's390-5.4-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · 969a5197
      Linus Torvalds authored
      Pull s390 fixes from Vasily Gorbik:
      
       - Fix cpu idle time accounting
      
       - Fix stack unwinder case when both pt_regs and sp are specified
      
       - Fix information leak via cmm timeout proc handler
      
      * tag 's390-5.4-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
        s390/idle: fix cpu idle time calculation
        s390/unwind: fix mixing regs and sp
        s390/cmm: fix information leak in cmm_timeout_handler()
      969a5197
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · 1204c70d
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix free/alloc races in batmanadv, from Sven Eckelmann.
      
       2) Several leaks and other fixes in kTLS support of mlx5 driver, from
          Tariq Toukan.
      
       3) BPF devmap_hash cost calculation can overflow on 32-bit, from Toke
          Høiland-Jørgensen.
      
       4) Add an r8152 device ID, from Kazutoshi Noguchi.
      
       5) Missing include in ipv6's addrconf.c, from Ben Dooks.
      
       6) Use siphash in flow dissector, from Eric Dumazet. Attackers can
          easily infer the 32-bit secret otherwise etc.
      
       7) Several netdevice nesting depth fixes from Taehee Yoo.
      
       8) Fix several KCSAN reported errors, from Eric Dumazet. For example,
          when doing lockless skb_queue_empty() checks, and accessing
          sk_napi_id/sk_incoming_cpu lockless as well.
      
       9) Fix jumbo packet handling in RXRPC, from David Howells.
      
      10) Bump SOMAXCONN and tcp_max_syn_backlog values, from Eric Dumazet.
      
      11) Fix DMA synchronization in gve driver, from Yangchun Fu.
      
      12) Several bpf offload fixes, from Jakub Kicinski.
      
      13) Fix sk_page_frag() recursion during memory reclaim, from Tejun Heo.
      
      14) Fix ping latency during high traffic rates in hisilicon driver, from
          Jiangfent Xiao.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (146 commits)
        net: fix installing orphaned programs
        net: cls_bpf: fix NULL deref on offload filter removal
        selftests: bpf: Skip write only files in debugfs
        selftests: net: reuseport_dualstack: fix uninitalized parameter
        r8169: fix wrong PHY ID issue with RTL8168dp
        net: dsa: bcm_sf2: Fix IMP setup for port different than 8
        net: phylink: Fix phylink_dbg() macro
        gve: Fixes DMA synchronization.
        inet: stop leaking jiffies on the wire
        ixgbe: Remove duplicate clear_bit() call
        Documentation: networking: device drivers: Remove stray asterisks
        e1000: fix memory leaks
        i40e: Fix receive buffer starvation for AF_XDP
        igb: Fix constant media auto sense switching when no cable is connected
        net: ethernet: arc: add the missed clk_disable_unprepare
        igb: Enable media autosense for the i350.
        igb/igc: Don't warn on fatal read failures when the device is removed
        tcp: increase tcp_max_syn_backlog max value
        net: increase SOMAXCONN to 4096
        netdevsim: Fix use-after-free during device dismantle
        ...
      1204c70d
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-5.4-3' of git://git.linux-nfs.org/projects/anna/linux-nfs · 372bf6c1
      Linus Torvalds authored
      Pull NFS client bugfixes from Anna Schumaker:
       "This contains two delegation fixes (with the RCU lock leak fix marked
        for stable), and three patches to fix destroying the the sunrpc back
        channel.
      
        Stable bugfixes:
      
         - Fix an RCU lock leak in nfs4_refresh_delegation_stateid()
      
        Other fixes:
      
         - The TCP back channel mustn't disappear while requests are
           outstanding
      
         - The RDMA back channel mustn't disappear while requests are
           outstanding
      
         - Destroy the back channel when we destroy the host transport
      
         - Don't allow a cached open with a revoked delegation"
      
      * tag 'nfs-for-5.4-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
        NFS: Fix an RCU lock leak in nfs4_refresh_delegation_stateid()
        NFSv4: Don't allow a cached open with a revoked delegation
        SUNRPC: Destroy the back channel when we destroy the host transport
        SUNRPC: The RDMA back channel mustn't disappear while requests are outstanding
        SUNRPC: The TCP back channel mustn't disappear while requests are outstanding
      372bf6c1
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20191101' of git://git.kernel.dk/linux-block · 0821de28
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
      
       - Two small nvme fixes, one is a fabrics connection fix, the other one
         a cleanup made possible by that fix (Anton, via Keith)
      
       - Fix requeue handling in umb ubd (Anton)
      
       - Fix spin_lock_irq() nesting in blk-iocost (Dan)
      
       - Three small io_uring fixes:
           - Install io_uring fd after done with ctx (me)
           - Clear ->result before every poll issue (me)
           - Fix leak of shadow request on error (Pavel)
      
      * tag 'for-linus-20191101' of git://git.kernel.dk/linux-block:
        iocost: don't nest spin_lock_irq in ioc_weight_write()
        io_uring: ensure we clear io_kiocb->result before each issue
        um-ubd: Entrust re-queue to the upper layers
        nvme-multipath: remove unused groups_only mode in ana log
        nvme-multipath: fix possible io hang after ctrl reconnect
        io_uring: don't touch ctx in setup after ring fd install
        io_uring: Fix leaked shadow_req
      0821de28
    • Linus Torvalds's avatar
      Merge tag 'riscv/for-v5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · e5897c7d
      Linus Torvalds authored
      Pull RISC-V fixes from Paul Walmsley:
       "One fix for PCIe users:
      
         - Fix legacy PCI I/O port access emulation
      
        One set of cleanups:
      
         - Resolve most of the warnings generated by sparse across arch/riscv.
           No functional changes
      
        And one MAINTAINERS update:
      
         - Update Palmer's E-mail address"
      
      * tag 'riscv/for-v5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
        MAINTAINERS: Change to my personal email address
        RISC-V: Add PCIe I/O BAR memory mapping
        riscv: for C functions called only from assembly, mark with __visible
        riscv: fp: add missing __user pointer annotations
        riscv: add missing header file includes
        riscv: mark some code and data as file-static
        riscv: init: merge split string literals in preprocessor directive
        riscv: add prototypes for assembly language functions from head.S
      e5897c7d
  6. 01 Nov, 2019 12 commits