# git rev-parse -q --verify f2748bdfe157343eb8cf910a1d89ccf2fd20100b^{commit}
f2748bdfe157343eb8cf910a1d89ccf2fd20100b
already have revision, skipping fetch
# git checkout -q -f -B kisskb f2748bdfe157343eb8cf910a1d89ccf2fd20100b
# git clean -qxdf
# < git log -1
# commit f2748bdfe157343eb8cf910a1d89ccf2fd20100b
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Sun Apr 1 20:36:15 2018 +1000
# 
#     powerpc/powernv: Always stop secondaries before reboot/shutdown
#     
#     Currently powernv reboot and shutdown requests just leave secondaries
#     to do their own things. This is undesirable because they can trigger
#     any number of watchdogs while waiting for reboot, but also we don't
#     know what else they might be doing -- they might be causing trouble,
#     trampling memory, etc.
#     
#     The opal scheduled flash update code already ran into watchdog problems
#     due to flashing taking a long time, and it was fixed with 2196c6f1ed
#     ("powerpc/powernv: Return secondary CPUs to firmware before FW update"),
#     which returns secondaries to opal. It's been found that regular reboots
#     can take over 10 seconds, which can result in the hard lockup watchdog
#     firing,
#     
#       reboot: Restarting system
#       [  360.038896709,5] OPAL: Reboot request...
#       Watchdog CPU:0 Hard LOCKUP
#       Watchdog CPU:44 detected Hard LOCKUP other CPUS:16
#       Watchdog CPU:16 Hard LOCKUP
#       watchdog: BUG: soft lockup - CPU#16 stuck for 3s! [swapper/16:0]
#     
#     This patch removes the special case for flash update, and calls
#     smp_send_stop in all cases before calling reboot/shutdown.
#     
#     smp_send_stop could return CPUs to OPAL, the main reason not to is
#     that the request could come from a NMI that interrupts OPAL code,
#     so re-entry to OPAL can cause a number of problems. Putting
#     secondaries into simple spin loops improves the chances of a
#     successful reboot.
#     
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Reviewed-by:  Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < git log --format=%s --max-count=1 f2748bdfe157343eb8cf910a1d89ccf2fd20100b
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  pseries_defconfig
# Added to kconfig CONFIG_MEMORY_HOTPLUG=y
# Added to kconfig CONFIG_MEMORY_HOTREMOVE=n
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/swap_state.c: In function '__add_to_swap_cache':
/kisskb/src/mm/swap_state.c:135:5: warning: 'error' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1439:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/bridge/br_netlink.c: In function 'br_afspec':
/kisskb/src/net/bridge/br_netlink.c:635:7: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc':
/kisskb/src/fs/nfsd/nfs4xdr.c:2043:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1816:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1726:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:251:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:231:19: note: 'i' was declared here
WARNING: modpost: Found 2 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
Completed OK
# rm -rf /kisskb/build/powerpc-next_pseries_defconfig+NO_MEMORY_HOTREMOVE_powerpc
# Build took: 0:02:17.078811