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    Subject[GIT PULL] tracing: Updates for 5.11

    Linus,

    Tracing updates for 5.11

    ** Note there's a minor conflict with mainline, see second paragraph **

    The major update to this release is that there's a new arch config option called:
    CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS. Currently, only x86_64 enables it.
    All the ftrace callbacks now take a struct ftrace_regs instead of a struct
    pt_regs. If the architecture has HAVE_DYNAMIC_FTRACE_WITH_ARGS enabled, then
    the ftrace_regs will have enough information to read the arguments of the
    function being traced, as well as access to the stack pointer. This way, if
    a user (like live kernel patching) only cares about the arguments, then it
    can avoid using the heavier weight "regs" callback, that puts in enough
    information in the struct ftrace_regs to simulate a breakpoint exception
    (needed for kprobes).

    New config option that audits the timestamps of the ftrace ring buffer at
    most every event recorded. The "check_buffer()" calls will conflict with
    mainline, because I purposely added the check without including the fix that
    it caught, which is in mainline. Running a kernel built from the commit of
    the added check will trigger it.

    Ftrace recursion protection has been cleaned up to move the protection to
    the callback itself (this saves on an extra function call for those
    callbacks).

    Perf now handles its own RCU protection and does not depend on ftrace to do
    it for it (saving on that extra function call).

    New debug option to add "recursed_functions" file to tracefs that lists all
    the places that triggered the recursion protection of the function tracer.
    This will show where things need to be fixed as recursion slows down the
    function tracer.

    The eval enum mapping updates done at boot up are now offloaded to a work
    queue, as it caused a noticeable pause on slow embedded boards.

    Various clean ups and last minute fixes.


    Please pull the latest trace-v5.11 tree, which can be found at:


    git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
    trace-v5.11

    Tag SHA1: 5db8571616e109a83cc9164e1c0e7875fe3f92b3
    Head SHA1: f6a694665f132cbf6e2222dd2f173dc35330a8aa


    Alex Shi (1):
    ftrace: Remove unused varible 'ret'

    Arnd Bergmann (1):
    seq_buf: Avoid type mismatch for seq_buf_init

    Kaixu Xia (1):
    tracing: Remove the useless value assignment in test_create_synth_event()

    Lukas Bulwahn (4):
    MAINTAINERS: assign ./fs/tracefs to TRACING
    tracing: Clean up after filter logic rewriting
    ring-buffer: Remove obsolete rb_event_is_commit()
    tracing: Drop unneeded assignment in ring_buffer_resize()

    Masami Hiramatsu (1):
    tracing: Disable ftrace selftests when any tracer is running

    Qiujun Huang (4):
    tracing: Fix some typos in comments
    ring-buffer: Fix a typo in function description
    ring-buffer: Fix two typos in comments
    ring-buffer: Add rb_check_bpage in __rb_allocate_pages

    Steven Rostedt (VMware) (21):
    ftrace: Move the recursion testing into global headers
    ftrace: Add ftrace_test_recursion_trylock() helper function
    ftrace: Optimize testing what context current is in
    pstore/ftrace: Add recursion protection to the ftrace callback
    kprobes/ftrace: Add recursion protection to the ftrace callback
    livepatch/ftrace: Add recursion protection to the ftrace callback
    livepatch: Trigger WARNING if livepatch function fails due to recursion
    perf/ftrace: Add recursion protection to the ftrace callback
    perf/ftrace: Check for rcu_is_watching() in callback function
    ftrace: Reverse what the RECURSION flag means in the ftrace_ops
    ftrace: Add recording of functions that caused recursion
    fgraph: Make overruns 4 bytes in graph stack structure
    ftrace: Clean up the recursion code a bit
    ring-buffer: Add recording of ring buffer recursion into recursed_functions
    ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs
    ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default
    livepatch: Use the default ftrace_ops instead of REGS when ARGS is available
    ftrace/documentation: Fix RST C code blocks
    ring-buffer: Add test to validate the time stamp deltas
    Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS"
    tracing: Offload eval map updates to a work queue

    ----
    Documentation/trace/ftrace-uses.rst | 90 +++++++++----
    MAINTAINERS | 1 +
    arch/Kconfig | 16 +++
    arch/csky/kernel/probes/ftrace.c | 16 ++-
    arch/nds32/kernel/ftrace.c | 4 +-
    arch/parisc/kernel/ftrace.c | 24 +++-
    arch/powerpc/include/asm/livepatch.h | 4 +-
    arch/powerpc/kernel/kprobes-ftrace.c | 15 ++-
    arch/s390/include/asm/livepatch.h | 5 +-
    arch/s390/kernel/ftrace.c | 20 ++-
    arch/x86/Kconfig | 1 +
    arch/x86/include/asm/ftrace.h | 18 +++
    arch/x86/include/asm/livepatch.h | 4 +-
    arch/x86/kernel/ftrace_64.S | 15 ++-
    arch/x86/kernel/kprobes/ftrace.c | 15 ++-
    fs/pstore/ftrace.c | 8 +-
    include/linux/ftrace.h | 45 +++++--
    include/linux/kprobes.h | 2 +-
    include/linux/seq_buf.h | 2 +-
    include/linux/trace_recursion.h | 232 +++++++++++++++++++++++++++++++++
    include/linux/trace_seq.h | 4 +-
    kernel/livepatch/Kconfig | 2 +-
    kernel/livepatch/patch.c | 15 ++-
    kernel/trace/Kconfig | 68 ++++++++++
    kernel/trace/Makefile | 1 +
    kernel/trace/blktrace.c | 4 +-
    kernel/trace/bpf_trace.c | 2 +-
    kernel/trace/fgraph.c | 3 +-
    kernel/trace/ftrace.c | 57 ++++----
    kernel/trace/ring_buffer.c | 223 +++++++++++++++++++++++++++-----
    kernel/trace/synth_event_gen_test.c | 2 +-
    kernel/trace/trace.c | 53 ++++++--
    kernel/trace/trace.h | 182 +-------------------------
    kernel/trace/trace_benchmark.c | 6 +-
    kernel/trace/trace_boot.c | 2 +
    kernel/trace/trace_dynevent.c | 2 +-
    kernel/trace/trace_dynevent.h | 6 +-
    kernel/trace/trace_entries.h | 6 +-
    kernel/trace/trace_event_perf.c | 15 ++-
    kernel/trace/trace_events.c | 9 +-
    kernel/trace/trace_events_filter.c | 23 +---
    kernel/trace/trace_events_hist.c | 2 +-
    kernel/trace/trace_events_synth.c | 4 +-
    kernel/trace/trace_export.c | 2 +-
    kernel/trace/trace_functions.c | 23 ++--
    kernel/trace/trace_functions_graph.c | 2 +-
    kernel/trace/trace_hwlat.c | 4 +-
    kernel/trace/trace_irqsoff.c | 2 +-
    kernel/trace/trace_kprobe.c | 9 +-
    kernel/trace/trace_output.c | 6 +-
    kernel/trace/trace_output.h | 1 +
    kernel/trace/trace_recursion_record.c | 236 ++++++++++++++++++++++++++++++++++
    kernel/trace/trace_sched_wakeup.c | 2 +-
    kernel/trace/trace_selftest.c | 29 ++---
    kernel/trace/trace_stack.c | 3 +-
    kernel/trace/tracing_map.c | 6 +-
    kernel/trace/tracing_map.h | 2 +-
    57 files changed, 1140 insertions(+), 415 deletions(-)
    create mode 100644 include/linux/trace_recursion.h
    create mode 100644 kernel/trace/trace_recursion_record.c
    ---------------------------

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