# 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 d6e3af06d947d4f23b5698007e9a1a6313d2ed58
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_ge_imp3a_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  85xx/ge_imp3a_defconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_ge_imp3a_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<U36e0>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U36e0>]' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:193:16: 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:2589:6: 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:1850:6: warning: 'ret' 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:331:21: note: 'pdeo' was declared here
/kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc':
/kisskb/src/fs/nfsd/nfs4xdr.c:2077:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:227:19: note: 'i' was declared here
/kisskb/src/fs/udf/unicode.c: In function 'udf_name_conv_char':
/kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c: In function 'tun_get_user':
/kisskb/src/drivers/net/tun.c:1851:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1764:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
INFO: Uncompressed kernel (size 0x84c250) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x900000)
Image Name:   Linux-5.2.0-rc1-gd6e3af06d947
Created:      Fri May 31 00:57:38 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    4259446 Bytes = 4159.62 KiB = 4.06 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_85xx_ge_imp3a_defconfig_powerpc-gcc4.6
# Build took: 0:00:21.582302