# 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/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-ld --version
# < git log --format=%s --max-count=1 e610a466d16a086e321f0bd421e2fc75cff28605
# < make -s -j 120 ARCH=alpha O=/kisskb/build/powerpc-next_alpha-defconfig_alpha CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-  defconfig
# make -s -j 120 ARCH=alpha O=/kisskb/build/powerpc-next_alpha-defconfig_alpha CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/alpha-linux/bin/alpha-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:194:16: 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:331:21: note: 'pdeo' was declared here
/kisskb/src/net/ipv4/ip_output.c: In function '__ip_append_data':
/kisskb/src/include/linux/skbuff.h:1406:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/ipv4/ip_output.c:881:14: note: 'extra_uref' was declared here
/kisskb/src/net/ipv4/fib_semantics.c: In function 'fib_check_nh_v4_gw':
/kisskb/src/net/ipv4/fib_semantics.c:1027:12: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
WARNING: "saved_config" [vmlinux] is COMMON symbol
  Kernel arch/alpha/boot/vmlinux.gz is ready
Completed OK
# rm -rf /kisskb/build/powerpc-next_alpha-defconfig_alpha
# Build took: 0:00:28.136025