# git rev-parse -q --verify 19ce7909ed11c49f7eddf59e7f49cd3062bf83d5^{commit}
19ce7909ed11c49f7eddf59e7f49cd3062bf83d5
already have revision, skipping fetch
# git checkout -q -f -B kisskb 19ce7909ed11c49f7eddf59e7f49cd3062bf83d5
# git clean -qxdf
# < git log -1
# commit 19ce7909ed11c49f7eddf59e7f49cd3062bf83d5
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Fri Apr 6 03:56:30 2018 +1000
# 
#     KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode
#     
#     This crashes with a "Bad real address for load" attempting to load
#     from the vmalloc region in realmode (faulting address is in DAR).
#     
#       Oops: Bad interrupt in KVM entry/exit code, sig: 6 [#1]
#       LE SMP NR_CPUS=2048 NUMA PowerNV
#       CPU: 53 PID: 6582 Comm: qemu-system-ppc Not tainted 4.16.0-01530-g43d1859f0994
#       NIP:  c0000000000155ac LR: c0000000000c2430 CTR: c000000000015580
#       REGS: c000000fff76dd80 TRAP: 0200   Not tainted  (4.16.0-01530-g43d1859f0994)
#       MSR:  9000000000201003 <SF,HV,ME,RI,LE>  CR: 48082222  XER: 00000000
#       CFAR: 0000000102900ef0 DAR: d00017fffd941a28 DSISR: 00000040 SOFTE: 3
#       NIP [c0000000000155ac] perf_trace_tlbie+0x2c/0x1a0
#       LR [c0000000000c2430] do_tlbies+0x230/0x2f0
#     
#     I suspect the reason is the per-cpu data is not in the linear chunk.
#     This could be restored if that was able to be fixed, but for now,
#     just remove the tracepoints.
#     
#     Fixes: 0428491cba92 ("powerpc/mm: Trace tlbie(l) instructions")
#     Cc: stable@vger.kernel.org # v4.13+
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.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 19ce7909ed11c49f7eddf59e7f49cd3062bf83d5
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  pmac32_defconfig
# Added to kconfig CONFIG_SMP=y
# yes \n | make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_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 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/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/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:220:2: warning: 'speaker_vol' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:182:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:146:32: warning: 'levelspread[<U6c80>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:94:6: note: 'levelspread[<U6c80>]' was declared here
/kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence':
/kisskb/src/drivers/dma-buf/reservation.c:225:6: warning: 'k' 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:2041:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1352:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1309:6: note: 'pwr_level_cisco' was declared here
/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
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1820:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1730:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/wireless/broadcom/b43/phy_n.c: In function 'b43_nphy_rf_ctl_override_rev7':
/kisskb/src/drivers/net/wireless/broadcom/b43/phy_n.c:202:21: warning: 'val_addr' may be used uninitialized in this function [-Wuninitialized]
INFO: Uncompressed kernel (size 0x90a1d0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0xa00000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pmac32_defconfig+SMP_powerpc
# Build took: 0:00:45.271817