# git rev-parse -q --verify 2c669ef6979c370f98d4b876e54f19613c81e075^{commit}
2c669ef6979c370f98d4b876e54f19613c81e075
already have revision, skipping fetch
# git checkout -q -f -B kisskb 2c669ef6979c370f98d4b876e54f19613c81e075
# git clean -qxdf
# < git log -1
# commit 2c669ef6979c370f98d4b876e54f19613c81e075
# Author: Valentin Schneider <valentin.schneider@arm.com>
# Date:   Wed Jul 7 19:38:31 2021 +0100
# 
#     powerpc/preempt: Don't touch the idle task's preempt_count during hotplug
#     
#     Powerpc currently resets a CPU's idle task preempt_count to 0 before
#     said task starts executing the secondary startup routine (and becomes an
#     idle task proper).
#     
#     This conflicts with commit f1a0a376ca0c ("sched/core: Initialize the
#     idle task with preemption disabled").
#     
#     which initializes all of the idle tasks' preempt_count to
#     PREEMPT_DISABLED during smp_init(). Note that this was superfluous
#     before said commit, as back then the hotplug machinery would invoke
#     init_idle() via idle_thread_get(), which would have already reset the
#     CPU's idle task's preempt_count to PREEMPT_ENABLED.
#     
#     Get rid of this preempt_count write.
#     
#     Fixes: f1a0a376ca0c ("sched/core: Initialize the idle task with preemption disabled")
#     Reported-by: Bharata B Rao <bharata@linux.ibm.com>
#     Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
#     Tested-by: Guenter Roeck <linux@roeck-us.net>
#     Tested-by: Bharata B Rao <bharata@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20210707183831.2106509-1-valentin.schneider@arm.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 2c669ef6979c370f98d4b876e54f19613c81e075
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTPLUG_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# Added to kconfig CONFIG_MEMORY_HOTPLUG=n
# Added to kconfig CONFIG_MEMORY_HOTREMOVE=n
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTPLUG_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTPLUG_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+NO_MEMORY_HOTPLUG_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-fixes_pseries_defconfig+NO_MEMORY_HOTPLUG_powerpc-gcc5
# Build took: 0:04:11.329344