# git rev-parse -q --verify 249fad734a25889a4f23ed014d43634af6798063^{commit}
249fad734a25889a4f23ed014d43634af6798063
already have revision, skipping fetch
# git checkout -q -f -B kisskb 249fad734a25889a4f23ed014d43634af6798063
# git clean -qxdf
# < git log -1
# commit 249fad734a25889a4f23ed014d43634af6798063
# Author: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
# Date:   Mon Nov 18 09:14:52 2019 +0530
# 
#     powerpc/perf: Disable trace_imc pmu
#     
#     When a root user or a user with CAP_SYS_ADMIN privilege uses any
#     trace_imc performance monitoring unit events, to monitor application
#     or KVM threads, it may result in a checkstop (System crash).
#     
#     The cause is frequent switching of the "trace/accumulation" mode of
#     the In-Memory Collection hardware (LDBAR).
#     
#     This patch disables the trace_imc PMU unit entirely to avoid
#     triggering the checkstop. A future patch will reenable it at a later
#     stage once a workaround has been developed.
#     
#     Fixes: 012ae244845f ("powerpc/perf: Trace imc PMU functions")
#     Cc: stable@vger.kernel.org # v5.2+
#     Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
#     Tested-by: Hariharan T.S. <hari@linux.ibm.com>
#     [mpe: Add pr_info_once() so dmesg shows the PMU has been disabled]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191118034452.9939-1-maddy@linux.vnet.ibm.com
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 249fad734a25889a4f23ed014d43634af6798063
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:38: LSE atomics not supported by binutils
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr':
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized]
   pd->msg->buf[real_pos] = data;
                          ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here
  unsigned char data;
                ^
In file included from /kisskb/src/include/linux/rwsem.h:16:0,
                 from /kisskb/src/include/linux/notifier.h:15,
                 from /kisskb/src/include/linux/clk.h:14,
                 from /kisskb/src/drivers/tty/serial/sh-sci.c:24:
/kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/tty/serial/sh-sci.c:1352:16: note: 'flags' was declared here
  unsigned long flags;
                ^
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4
# Build took: 0:04:29.893071