# git rev-parse -q --verify 73aca179d78eaa11604ba0783a6d8b2125fbc332^{commit}
73aca179d78eaa11604ba0783a6d8b2125fbc332
already have revision, skipping fetch
# git checkout -q -f -B kisskb 73aca179d78eaa11604ba0783a6d8b2125fbc332
# git clean -qxdf
# < git log -1
# commit 73aca179d78eaa11604ba0783a6d8b2125fbc332
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon Mar 26 19:27:01 2018 +1100
# 
#     powerpc/modules: Fix crashes by adding CONFIG_RELOCATABLE to vermagic
#     
#     If you build the kernel with CONFIG_RELOCATABLE=n, then install the
#     modules, rebuild the kernel with CONFIG_RELOCATABLE=y and leave the
#     old modules installed, we crash something like:
#     
#       Unable to handle kernel paging request for data at address 0xd000000018d66cef
#       Faulting instruction address: 0xc0000000021ddd08
#       Oops: Kernel access of bad area, sig: 11 [#1]
#       Modules linked in: x_tables autofs4
#       CPU: 2 PID: 1 Comm: systemd Not tainted 4.16.0-rc6-gcc_ubuntu_le-g99fec39 #1
#       ...
#       NIP check_version.isra.22+0x118/0x170
#       Call Trace:
#         __ksymtab_xt_unregister_table+0x58/0xfffffffffffffcb8 [x_tables] (unreliable)
#         resolve_symbol+0xb4/0x150
#         load_module+0x10e8/0x29a0
#         SyS_finit_module+0x110/0x140
#         system_call+0x58/0x6c
#     
#     This happens because since commit 71810db27c1c ("modversions: treat
#     symbol CRCs as 32 bit quantities"), a relocatable kernel encodes and
#     handles symbol CRCs differently from a non-relocatable kernel.
#     
#     Although it's possible we could try and detect this situation and
#     handle it, it's much more robust to simply make the state of
#     CONFIG_RELOCATABLE part of the module vermagic.
#     
#     Fixes: 71810db27c1c ("modversions: treat symbol CRCs as 32 bit quantities")
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 73aca179d78eaa11604ba0783a6d8b2125fbc332
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
WARNING: modpost: Found 2 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-5.3
# Build took: 0:02:52.914258