# git rev-parse -q --verify a3bf9fbdad600b1e4335dd90979f8d6072e4f602^{commit}
a3bf9fbdad600b1e4335dd90979f8d6072e4f602
already have revision, skipping fetch
# git checkout -q -f -B kisskb a3bf9fbdad600b1e4335dd90979f8d6072e4f602
# git clean -qxdf
# < git log -1
# commit a3bf9fbdad600b1e4335dd90979f8d6072e4f602
# 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/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 a3bf9fbdad600b1e4335dd90979f8d6072e4f602
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 48 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
/kisskb/src/net/ipv4/fib_semantics.c: In function 'fib_check_nh_v4_gw':
/kisskb/src/net/ipv4/fib_semantics.c:1027:12: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (!tbl || err) {
            ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr':
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized]
   pd->msg->buf[real_pos] = data;
                          ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here
  unsigned char data;
                ^
In file included from /kisskb/src/include/linux/rwsem.h:16:0,
                 from /kisskb/src/include/linux/notifier.h:15,
                 from /kisskb/src/include/linux/clk.h:17,
                 from /kisskb/src/drivers/tty/serial/sh-sci.c:24:
/kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/tty/serial/sh-sci.c:1353:16: note: 'flags' was declared here
  unsigned long flags;
                ^
Completed OK
# rm -rf /kisskb/build/powerpc-next_arm64-defconfig_arm64-gcc5.4
# Build took: 0:03:59.953488