# git rev-parse -q --verify 8e9ad2720cd1cf55530755362ad899f69e09fb9a^{commit}
8e9ad2720cd1cf55530755362ad899f69e09fb9a
already have revision, skipping fetch
# git checkout -q -f -B kisskb 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# git clean -qxdf
# < git log -1
# commit 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Wed Feb 12 22:11:00 2020 +1100
# 
#     powerpc/xmon: Lower limits on nidump and ndump
#     
#     In xmon we have two variables that are used by the dump commands.
#     There's ndump which is the number of bytes to dump using 'd', and
#     nidump which is the number of instructions to dump using 'di'.
#     
#     ndump starts as 64 and nidump starts as 16, but both can be set by the
#     user.
#     
#     It's fairly common to be pasting addresses into xmon when trying to
#     debug something, and if you inadvertently double paste an address like
#     so:
#     
#       0:mon> di c000000002101f6c c000000002101f6c
#     
#     The second value is interpreted as the number of instructions to dump.
#     
#     Luckily it doesn't dump 13 quintrillion instructions, the value is
#     limited to MAX_DUMP (128K). But as each instruction is dumped on a
#     single line, that's still a lot of output. If you're on a slow console
#     that can take multiple minutes to print. If you were "just popping in
#     and out of xmon quickly before the RCU/hardlockup detector fires" you
#     are now having a bad day.
#     
#     Things are not as bad with 'd' because we print 16 bytes per line, so
#     it's fewer lines. But it's still quite a lot.
#     
#     So shrink the maximum for 'd' to 64K (one page), which is 4096 lines.
#     For 'di' add a new limit which is the above / 4 - because instructions
#     are 4 bytes, meaning again we can dump one page.
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /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 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-next_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-next_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:35: LSE atomics not supported by binutils
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:20:
/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:1348:16: note: 'flags' was declared here
  unsigned long flags;
                ^
/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;
                ^
Completed OK
# rm -rf /kisskb/build/powerpc-next_arm64-defconfig_arm64-gcc5.4
# Build took: 0:05:19.314310