# git rev-parse -q --verify 274cb1ca2e7ce02cab56f5f4c61a74aeb566f931^{commit}
274cb1ca2e7ce02cab56f5f4c61a74aeb566f931
already have revision, skipping fetch
# git checkout -q -f -B kisskb 274cb1ca2e7ce02cab56f5f4c61a74aeb566f931
# git clean -qxdf
# < git log -1
# commit 274cb1ca2e7ce02cab56f5f4c61a74aeb566f931
# Author: Nathan Lynch <nathanl@linux.ibm.com>
# Date:   Mon Mar 15 03:00:45 2021 -0500
# 
#     powerpc/pseries/mobility: handle premature return from H_JOIN
#     
#     The pseries join/suspend sequence in its current form was written with
#     the assumption that it was the only user of H_PROD and that it needn't
#     handle spurious successful returns from H_JOIN. That's wrong;
#     powerpc's paravirt spinlock code uses H_PROD, and CPUs entering
#     do_join() can be woken prematurely from H_JOIN with a status of
#     H_SUCCESS as a result. This causes all CPUs to exit the sequence
#     early, preventing suspend from occurring at all.
#     
#     Add a 'done' boolean flag to the pseries_suspend_info struct, and have
#     the waking thread set it before waking the other threads. Threads
#     which receive H_SUCCESS from H_JOIN retry if the 'done' flag is still
#     unset.
#     
#     Fixes: 9327dc0aeef3 ("powerpc/pseries/mobility: use stop_machine for join/suspend")
#     Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20210315080045.460331-3-nathanl@linux.ibm.com
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 274cb1ca2e7ce02cab56f5f4c61a74aeb566f931
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# Added to kconfig CONFIG_SMP=n
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+UP_powerpc-gcc9
# Build took: 0:04:02.552107