# git rev-parse -q --verify be65e2595b4c1fbeceba336d8ee83406726b1d8d^{commit}
be65e2595b4c1fbeceba336d8ee83406726b1d8d
already have revision, skipping fetch
# git checkout -q -f -B kisskb be65e2595b4c1fbeceba336d8ee83406726b1d8d
# git clean -qxdf
# < git log -1
# commit be65e2595b4c1fbeceba336d8ee83406726b1d8d
# Merge: 5404525b98c2 d1c392c9e2a3
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Sep 6 09:06:49 2018 -0700
# 
#     Merge tag 'trace-v4.19-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
#     
#     Pull tracing fixes from Steven Rostedt:
#      "This fixes two annoying bugs:
#     
#        - The first one is a side effect caused by using SRCU for rcuidle
#          tracepoints. It seems that the perf was depending on the rcuidle
#          tracepoints to make RCU watch when it wasn't.
#     
#          The real fix will be to have perf use SRCU instead of depending on
#          RCU watching, but that can't be done until SRCU is safe to use in
#          NMI context (Paul's working on that).
#     
#        - The second bug fix is for a bug that's been periodically making my
#          tests fail randomly for some time. I haven't had time to track it
#          down, but finally have. It has to do with stressing NMIs (via perf)
#          while enabling or disabling ftrace function handling with lockdep
#          enabled.
#     
#          If an interrupt happens and just as it returns, it sets lockdep
#          back to "interrupts enabled" but before it returns an NMI is
#          triggered, and if this happens while printk_nmi_enter has a
#          breakpoint attached to it (because ftrace is converting it to or
#          from nop to call fentry), the breakpoint trap also calls into
#          lockdep, and since returning from the NMI to a interrupt handler,
#          interrupts were disabled when the NMI went off, lockdep keeps its
#          state as interrupts disabled when it returns back from the
#          interrupt handler where interrupts are enabled.
#     
#          This causes lockdep_assert_irqs_enabled() to trigger a false
#          positive"
#     
#     * tag 'trace-v4.19-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
#       printk/tracing: Do not trace printk_nmi_enter()
#       tracing: Add back in rcu_irq_enter/exit_irqson() for rcuidle tracepoints
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < git log --format=%s --max-count=1 be65e2595b4c1fbeceba336d8ee83406726b1d8d
# < make -s -j 48 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 allmodconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_KCOV=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n
# Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n
# Added to kconfig CONFIG_UML_NET=n
# Added to kconfig CONFIG_UML_NET_ETHERTAP=n
# Added to kconfig CONFIG_UML_NET_TUNTAP=n
# Added to kconfig CONFIG_UML_NET_SLIP=n
# Added to kconfig CONFIG_UML_NET_DAEMON=n
# Added to kconfig CONFIG_UML_NET_VDE=n
# Added to kconfig CONFIG_UML_NET_MCAST=n
# Added to kconfig CONFIG_UML_NET_PCAP=n
# Added to kconfig CONFIG_UML_NET_SLIRP=n
# Added to kconfig CONFIG_GCOV_KERNEL=n
# yes \n | make -s -j 48 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 oldconfig
yes: standard output: Broken pipe
# make -s -j 48 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
/kisskb/src/scripts/unifdef.c: In function 'Mpass':
/kisskb/src/scripts/unifdef.c:453:28: warning: 'strncpy' output truncated before terminating nul copying 4 bytes from a string of the same length [-Wstringop-truncation]
 static void Mpass (void) { strncpy(keyword, "if  ", 4); Pelif(); }
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/kisskb/src/Makefile:1185: *** Headers not exportable for the um architecture.  Stop.
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:146: sub-make] Error 2
Command 'make -s -j 48 ARCH=um O=/kisskb/build/linus_um-allmodconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus_um-allmodconfig_um-x86_64
# Build took: 0:00:07.787079