# 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-4.6.3-nolibc/s390x-linux/bin/s390x-linux-gcc --version
# < git log --format=%s --max-count=1 73aca179d78eaa11604ba0783a6d8b2125fbc332
# < make -s -j 80 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  defconfig
# make -s -j 80 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/s390x-linux/bin/s390x-linux-  
/kisskb/src/kernel/bpf/syscall.c:1229:12: warning: 'bpf_prog_attach_check_attach_type' defined but not used [-Wunused-function]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:182:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' 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:1820:30: warning: 'copylen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/net/tun.c:1730:46: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_s390-defconfig_s390x
# Build took: 0:02:20.419661