# git rev-parse -q --verify 4f9e7fabf8643003afefc172e62dd276686f016e^{commit}
4f9e7fabf8643003afefc172e62dd276686f016e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4f9e7fabf8643003afefc172e62dd276686f016e
# git clean -qxdf
# < git log -1
# commit 4f9e7fabf8643003afefc172e62dd276686f016e
# Merge: 14ddccc8a647 e332938e6fc8
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Aug 24 19:39:20 2023 -0700
# 
#     Merge tag 'trace-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
#     
#     Pull tracing fixes from Steven Rostedt:
#     
#      - Fix ring buffer being permanently disabled due to missed
#        record_disabled()
#     
#        Changing the trace cpu mask will disable the ring buffers for the
#        CPUs no longer in the mask. But it fails to update the snapshot
#        buffer. If a snapshot takes place, the accounting for the ring buffer
#        being disabled is corrupted and this can lead to the ring buffer
#        being permanently disabled.
#     
#      - Add test case for snapshot and cpu mask working together
#     
#      - Fix memleak by the function graph tracer not getting closed properly.
#     
#        The iterator is used to read the ring buffer. When it opens, it calls
#        the open function of a tracer, and when it is closed, it calls the
#        close iteration. While a trace is being read, it is still possible to
#        change the tracer.
#     
#        If this happens between the function graph tracer and the wakeup
#        tracer (which uses function graph tracing), the tracers are not
#        closed properly during when the iterator sees the switch, and the
#        wakeup function did not initialize its private pointer to NULL, which
#        is used to know if the function graph tracer was the last tracer. It
#        could be fooled in thinking it is, but then on exit it does not call
#        the close function of the function graph tracer to clean up its data.
#     
#      - Fix synthetic events on big endian machines, by introducing a union
#        that does the conversions properly.
#     
#      - Fix synthetic events from printing out the number of elements in the
#        stacktrace when it shouldn't.
#     
#      - Fix synthetic events stacktrace to not print a bogus value at the
#        end.
#     
#      - Introduce a pipe_cpumask that prevents the trace_pipe files from
#        being opened by more than one task (file descriptor).
#     
#        There was a race found where if splice is called, the iter->ent could
#        become stale and events could be missed. There's no point reading a
#        producer/consumer file by more than one task as they will corrupt
#        each other anyway. Add a cpumask that keeps track of the per_cpu
#        trace_pipe files as well as the global trace_pipe file that prevents
#        more than one open of a trace_pipe file that represents the same ring
#        buffer. This prevents the race from happening.
#     
#      - Fix ftrace samples for arm64 to work with older compilers.
#     
#     * tag 'trace-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
#       samples: ftrace: Replace bti assembly with hint for older compiler
#       tracing: Introduce pipe_cpumask to avoid race on trace_pipes
#       tracing: Fix memleak due to race between current_tracer and trace
#       tracing/synthetic: Allocate one additional element for size
#       tracing/synthetic: Skip first entry for stack traces
#       tracing/synthetic: Use union instead of casts
#       selftests/ftrace: Add a basic testcase for snapshot
#       tracing: Fix cpu buffers unavailable due to 'record_disabled' missed
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 4f9e7fabf8643003afefc172e62dd276686f016e
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_x86_64_defconfig_x86_64-gcc8
# Build took: 0:02:05.066224