# git rev-parse -q --verify e610a466d16a086e321f0bd421e2fc75cff28605^{commit}
e610a466d16a086e321f0bd421e2fc75cff28605
already have revision, skipping fetch
# git checkout -q -f -B kisskb e610a466d16a086e321f0bd421e2fc75cff28605
# git clean -qxdf
# < git log -1
# commit e610a466d16a086e321f0bd421e2fc75cff28605
# Author: Nathan Lynch <nathanl@linux.ibm.com>
# Date:   Tue Jun 11 23:45:06 2019 -0500
# 
#     powerpc/pseries/mobility: rebuild cacheinfo hierarchy post-migration
#     
#     It's common for the platform to replace the cache device nodes after a
#     migration. Since the cacheinfo code is never informed about this, it
#     never drops its references to the source system's cache nodes, causing
#     it to wind up in an inconsistent state resulting in warnings and oopses
#     as soon as CPU online/offline occurs after the migration, e.g.
#     
#       cache for /cpus/l3-cache@3113(Unified) refers to cache for /cpus/l2-cache@200d(Unified)
#       WARNING: CPU: 15 PID: 86 at arch/powerpc/kernel/cacheinfo.c:176 release_cache+0x1bc/0x1d0
#       [...]
#       NIP release_cache+0x1bc/0x1d0
#       LR  release_cache+0x1b8/0x1d0
#       Call Trace:
#         release_cache+0x1b8/0x1d0 (unreliable)
#         cacheinfo_cpu_offline+0x1c4/0x2c0
#         unregister_cpu_online+0x1b8/0x260
#         cpuhp_invoke_callback+0x114/0xf40
#         cpuhp_thread_fun+0x270/0x310
#         smpboot_thread_fn+0x2c8/0x390
#         kthread+0x1b8/0x1c0
#         ret_from_kernel_thread+0x5c/0x68
#     
#     Using device tree notifiers won't work since we want to rebuild the
#     hierarchy only after all the removals and additions have occurred and
#     the device tree is in a consistent state. Call cacheinfo_teardown()
#     before processing device tree updates, and rebuild the hierarchy
#     afterward.
#     
#     Fixes: 410bccf97881 ("powerpc/pseries: Partition migration in the kernel")
#     Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
#     Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 e610a466d16a086e321f0bd421e2fc75cff28605
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_skiroot_defconfig_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  skiroot_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_skiroot_defconfig_ppc64le-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
WARNING: vmlinux.o(.text+0x3128): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:early_setup()
The function start_here_multiplatform() references
the function __init early_setup().
This is often because start_here_multiplatform lacks a __init 
annotation or the annotation of early_setup is wrong.

WARNING: vmlinux.o(.text+0x3164): Section mismatch in reference from the variable start_here_common to the function .init.text:start_kernel()
The function start_here_common() references
the function __init start_kernel().
This is often because start_here_common lacks a __init 
annotation or the annotation of start_kernel is wrong.

Completed OK
# rm -rf /kisskb/build/powerpc-next_skiroot_defconfig_ppc64le-gcc5
# Build took: 0:01:28.163358