# 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_c2k_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  c2k_defconfig

WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE
  Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n]
  Selected by [y]:
  - PPC_C2K [=y] && EMBEDDED6xx [=y]

WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE
  Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n]
  Selected by [y]:
  - PPC_C2K [=y] && EMBEDDED6xx [=y]
# make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_c2k_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  

WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE
  Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n]
  Selected by [y]:
  - PPC_C2K [=y] && EMBEDDED6xx [=y]

WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE
  Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n]
  Selected by [y]:
  - PPC_C2K [=y] && EMBEDDED6xx [=y]
/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/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/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/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1822:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1732:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
INFO: Uncompressed kernel (size 0x6b9eac) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
Image Name:   Linux-4.17.0-rc2-gac61c11
Created:      Wed Apr 25 21:29:57 2018
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    3251778 Bytes = 3175.56 kB = 3.10 MB
Load Address: 00700000
Entry Point:  007004fc
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_c2k_defconfig_powerpc
# Build took: 0:00:53.762845