# git rev-parse -q --verify d6e3af06d947d4f23b5698007e9a1a6313d2ed58^{commit}
d6e3af06d947d4f23b5698007e9a1a6313d2ed58
already have revision, skipping fetch
# git checkout -q -f -B kisskb d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# git clean -qxdf
# < git log -1
# commit d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# Author: Greg Kurz <groug@kaod.org>
# Date:   Wed May 15 12:05:01 2019 +0200
# 
#     powerpc/pseries: Fix xive=off command line
#     
#     On POWER9, if the hypervisor supports XIVE exploitation mode, the
#     guest OS will unconditionally requests for the XIVE interrupt mode
#     even if XIVE was deactivated with the kernel command line xive=off.
#     Later on, when the spapr XIVE init code handles xive=off, it disables
#     XIVE and tries to fall back on the legacy mode XICS.
#     
#     This discrepency causes a kernel panic because the hypervisor is
#     configured to provide the XIVE interrupt mode to the guest :
#     
#       kernel BUG at arch/powerpc/sysdev/xics/xics-common.c:135!
#       ...
#       NIP xics_smp_probe+0x38/0x98
#       LR  xics_smp_probe+0x2c/0x98
#       Call Trace:
#         xics_smp_probe+0x2c/0x98 (unreliable)
#         pSeries_smp_probe+0x40/0xa0
#         smp_prepare_cpus+0x62c/0x6ec
#         kernel_init_freeable+0x148/0x448
#         kernel_init+0x2c/0x148
#         ret_from_kernel_thread+0x5c/0x68
#     
#     Look for xive=off during prom_init and don't ask for XIVE in this
#     case. One exception though: if the host only supports XIVE, we still
#     want to boot so we ignore xive=off.
#     
#     Similarly, have the spapr XIVE init code to looking at the interrupt
#     mode negotiated during CAS, and ignore xive=off if the hypervisor only
#     supports XIVE.
#     
#     Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller")
#     Cc: stable@vger.kernel.org # v4.20
#     Reported-by: Pavithra R. Prakash <pavrampu@in.ibm.com>
#     Signed-off-by: Greg Kurz <groug@kaod.org>
#     Reviewed-by: Cédric Le Goater <clg@kaod.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+KVM_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# Added to kconfig CONFIG_VIRTUALIZATION=y
# Added to kconfig CONFIG_KVM=y
# Added to kconfig CONFIG_KVM_BOOK3S_32=m
# Added to kconfig 
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+KVM_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pmac32_defconfig+KVM_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/sound/ppc/pmac.h:25:0,
                 from /kisskb/src/sound/ppc/awacs.c:29:
/kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return _snd_ctl_add_slave(master, slave, 0);
         ^
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
  struct snd_kcontrol *master_vol, *speaker_vol;
                                    ^
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return oldval == cmparg;
                 ^
/kisskb/src/kernel/futex.c:1633:6: note: 'oldval' was declared here
  int oldval, ret;
      ^
warning: same basename if the following are built as modules:
  arch/powerpc/platforms/powermac/nvram.ko
  drivers/char/nvram.ko
INFO: Uncompressed kernel (size 0x92a5e8) 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+KVM_powerpc-gcc5
# Build took: 0:01:33.613119