# git rev-parse -q --verify aa9581108f498991e309c4a90b1af0805d2e41b5^{commit}
aa9581108f498991e309c4a90b1af0805d2e41b5
already have revision, skipping fetch
# git checkout -q -f -B kisskb aa9581108f498991e309c4a90b1af0805d2e41b5
# git clean -qxdf
# < git log -1
# commit aa9581108f498991e309c4a90b1af0805d2e41b5
# Author: Masahiro Yamada <yamada.masahiro@socionext.com>
# Date:   Wed Nov 6 20:23:57 2019 +0900
# 
#     modpost: add an option to suppress 'exported twice' warnings
#     
#     Since commit "modpost: do not set ->preloaded for symbols from
#     Module.symvers", the modpost always warns about symbols exported
#     multiple times.
#     
#     Generally, I believe it is a good thing to show a warning when the
#     same symbol name is exported twice. This avoids the accidental symbol
#     conflict.
#     
#     However, in some cases, we build an external module to provide a
#     different version/variant of the in-kernel module, overriding the
#     same set of exported symbols.
#     
#     At least, there is one use-case in the upstream code;
#     tools/testing/nvdimm/libnvdimm.ko replaces drivers/nvdimm/libnvdimm.ko
#     in order to link it against mocked version of core kernel symbols.
#     
#     Now, this emits a lots of 'exported twice' warnings:
#     
#       https://lkml.org/lkml/2019/10/31/627
#     
#     To suppress those, add a new option KBUILD_MULTI_EXPORT_NO_WARN.
#     
#     If you intentionally override the existing symbols, you can pass it
#     from the command line:
#     
#       make M=tools/testing/nvdimm KBUILD_MULTI_EXPORT_NO_WARN=1
#     
#     Or, more conveniently, you can add it to the module Makefile, so
#     you can still do:
#     
#       make M=tools/testing/nvdimm
#     
#     without sprinkling the warnings.
#     
#     Reported-by: Jeff Moyer <jmoyer@redhat.com>
#     Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
#     Tested-by: Jeff Moyer <jmoyer@redhat.com>
# < /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 aa9581108f498991e309c4a90b1af0805d2e41b5
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/kbuild_44x_akebono_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  44x/akebono_defconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/kbuild_44x_akebono_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[<U8640>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U8640>]' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' 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:338:21: note: 'pdeo' was declared here
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2591:6: 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:1852:6: warning: 'ret' 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:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:251.28-289.5: Warning (pci_bridge): /plb/pciex@10100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:291.28-329.5: Warning (pci_bridge): /plb/pciex@20100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:331.28-369.5: Warning (pci_bridge): /plb/pciex@18100000000: node name is not "pci" or "pcie"
/kisskb/src/arch/powerpc/boot/dts/akebono.dts:371.28-409.5: Warning (pci_bridge): /plb/pciex@28100000000: node name is not "pci" or "pcie"
arch/powerpc/boot/dts/akebono.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
Completed OK
# rm -rf /kisskb/build/kbuild_44x_akebono_defconfig_powerpc-gcc4.6
# Build took: 0:00:34.122043