# 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-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 ac61c1156623455c46701654abd8c99720bceea1
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_mds_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  83xx/mpc836x_mds_defconfig
# make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_mpc836x_mds_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x4e8a20) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
INFO: Uncompressed kernel (size 0x4d8308) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-4.17.0-rc2-gac61c11
Created:      Wed Apr 25 22:33:53 2018
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2465439 Bytes = 2407.66 kB = 2.35 MB
Load Address: 00000000
Entry Point:  00000000
Image Name:   Linux-4.17.0-rc2-gac61c11
Created:      Wed Apr 25 22:33:53 2018
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2489736 Bytes = 2431.38 kB = 2.37 MB
Load Address: 00500000
Entry Point:  005001f4
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_83xx_mpc836x_mds_defconfig_powerpc-5.3
# Build took: 0:00:22.620863