# git rev-parse -q --verify 8e9ad2720cd1cf55530755362ad899f69e09fb9a^{commit}
8e9ad2720cd1cf55530755362ad899f69e09fb9a
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# 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/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 8e9ad2720cd1cf55530755362ad899f69e09fb9a
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  44x/iss476-smp_defconfig

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]

WARNING: unmet direct dependencies detected for HOTPLUG_CPU
  Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
  Selected by [y]:
  - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x64baf8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
INFO: Uncompressed kernel (size 0x64baf8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
Completed OK
# rm -rf /kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc5
# Build took: 0:00:49.450363