# 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_85xx_socrates_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  85xx/socrates_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_socrates_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x5978c0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Image Name:   Linux-5.2.0-rc2-ge610a466d16a
Created:      Sat Jun 15 17:59:25 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2893384 Bytes = 2825.57 KiB = 2.76 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-next_85xx_socrates_defconfig_powerpc-gcc5
# Build took: 0:00:39.578400