# git rev-parse -q --verify 94971b64cc4ea9040c3b4b846fd664f56adfed38^{commit}
94971b64cc4ea9040c3b4b846fd664f56adfed38
already have revision, skipping fetch
# git checkout -q -f -B kisskb 94971b64cc4ea9040c3b4b846fd664f56adfed38
# git clean -qxdf
# < git log -1
# commit 94971b64cc4ea9040c3b4b846fd664f56adfed38
# Author: Guilherme G. Piccoli <gpiccoli@igalia.com>
# Date:   Wed Apr 27 19:49:02 2022 -0300
# 
#     powerpc/setup: Refactor/untangle panic notifiers
#     
#     The panic notifiers infrastructure is a bit limited in the scope of
#     the callbacks - basically every kind of functionality is dropped
#     in a list that runs in the same point during the kernel panic path.
#     This is not really on par with the complexities and particularities
#     of architecture / hypervisors' needs, and a refactor is ongoing.
#     
#     As part of this refactor, it was observed that powerpc has 2 notifiers,
#     with mixed goals: one is just a KASLR offset dumper, whereas the other
#     aims to hard-disable IRQs (necessary on panic path), warn firmware of
#     the panic event (fadump) and run low-level platform-specific machinery
#     that might stop kernel execution and never come back.
#     
#     Clearly, the 2nd notifier has opposed goals: disable IRQs / fadump
#     should run earlier while low-level platform actions should
#     run late since it might not even return. Hence, this patch decouples
#     the notifiers splitting them in three:
#     
#     - First one is responsible for hard-disable IRQs and fadump,
#     should run early;
#     
#     - The kernel KASLR offset dumper is really an informative notifier,
#     harmless and may run at any moment in the panic path;
#     
#     - The last notifier should run last, since it aims to perform
#     low-level actions for specific platforms, and might never return.
#     It is also only registered for 2 platforms, pseries and ps3.
#     
#     The patch better documents the notifiers and clears the code too,
#     also removing a useless header.
#     
#     Currently no functionality change should be observed, but after
#     the planned panic refactor we should expect more panic reliability
#     with this patch.
#     
#     Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
#     Reviewed-by: Hari Bathini <hbathini@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20220427224924.592546-9-gpiccoli@igalia.com
# < /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 94971b64cc4ea9040c3b4b846fd664f56adfed38
# < make -s -j 120 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 120 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-  help
# make -s -j 120 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-  olddefconfig

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 120 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-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_44x_iss476-smp_defconfig_powerpc-gcc5
# Build took: 0:00:24.783307