# git rev-parse -q --verify ac61c1156623455c46701654abd8c99720bceea1^{commit}
ac61c1156623455c46701654abd8c99720bceea1
already have revision, skipping fetch
# git checkout -q -f -B kisskb ac61c1156623455c46701654abd8c99720bceea1
# git clean -qxdf
# < git log -1
# commit ac61c1156623455c46701654abd8c99720bceea1
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Wed Apr 25 12:17:53 2018 +1000
# 
#     powerpc: Fix smp_send_stop NMI IPI handling
#     
#     The NMI IPI handler for a receiving CPU increments nmi_ipi_busy_count
#     over the handler function call, which causes later smp_send_nmi_ipi()
#     callers to spin until the call is finished.
#     
#     The stop_this_cpu() function never returns, so the busy count is never
#     decremeted, which can cause the system to hang in some cases. For
#     example panic() will call smp_send_stop() early on which calls
#     stop_this_cpu() on other CPUs, then later in the reboot path,
#     pnv_restart() will call smp_send_stop() again, which hangs.
#     
#     Fix this by adding a special case to the stop_this_cpu() handler to
#     decrement the busy count, because it will never return.
#     
#     Now that the NMI/non-NMI versions of stop_this_cpu() are different,
#     split them out into separate functions rather than doing #ifdef tricks
#     to share the body between the two functions.
#     
#     Fixes: 6bed3237624e3 ("powerpc: use NMI IPI for smp_send_stop")
#     Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     [mpe: Split out the functions, tweak change log a bit]
#     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 ac61c1156623455c46701654abd8c99720bceea1
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/akebono_defconfig
# make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:340:21: note: 'pdeo' was declared here
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:146:32: warning: 'levelspread[<U7b40>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:94:6: note: 'levelspread[<U7b40>]' was declared here
/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/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' 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 1 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
arch/powerpc/boot/akebono.dtb: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/akebono.dtb: Warning (pci_bridge): /plb/pciex@20100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/akebono.dtb: Warning (pci_bridge): /plb/pciex@18100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/akebono.dtb: Warning (pci_bridge): /plb/pciex@28100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/akebono.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_44x_akebono_defconfig_powerpc
# Build took: 0:00:31.752824