# git rev-parse -q --verify 2923b27e54242acf27fd16b299e102117c82f52f^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
error: The last gc run reported the following. Please correct the root cause
and remove .git/gc.log.
Automatic cleanup will not be performed until the file is removed.

warning: There are too many unreachable loose objects; run 'git prune' to remove them.

# git rev-parse -q --verify 2923b27e54242acf27fd16b299e102117c82f52f^{commit}
2923b27e54242acf27fd16b299e102117c82f52f
# git checkout -q -f -B kisskb 2923b27e54242acf27fd16b299e102117c82f52f
# git clean -qxdf
# < git log -1
# commit 2923b27e54242acf27fd16b299e102117c82f52f
# Merge: 828bf6e904eb c953cc987ab8
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Aug 25 18:43:59 2018 -0700
# 
#     Merge tag 'libnvdimm-for-4.19_dax-memory-failure' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm
#     
#     Pull libnvdimm memory-failure update from Dave Jiang:
#      "As it stands, memory_failure() gets thoroughly confused by dev_pagemap
#       backed mappings. The recovery code has specific enabling for several
#       possible page states and needs new enabling to handle poison in dax
#       mappings.
#     
#       In order to support reliable reverse mapping of user space addresses:
#     
#        1/ Add new locking in the memory_failure() rmap path to prevent races
#           that would typically be handled by the page lock.
#     
#        2/ Since dev_pagemap pages are hidden from the page allocator and the
#           "compound page" accounting machinery, add a mechanism to determine
#           the size of the mapping that encompasses a given poisoned pfn.
#     
#        3/ Given pmem errors can be repaired, change the speculatively
#           accessed poison protection, mce_unmap_kpfn(), to be reversible and
#           otherwise allow ongoing access from the kernel.
#     
#       A side effect of this enabling is that MADV_HWPOISON becomes usable
#       for dax mappings, however the primary motivation is to allow the
#       system to survive userspace consumption of hardware-poison via dax.
#       Specifically the current behavior is:
#     
#          mce: Uncorrected hardware memory error in user-access at af34214200
#          {1}[Hardware Error]: It has been corrected by h/w and requires no further action
#          mce: [Hardware Error]: Machine check events logged
#          {1}[Hardware Error]: event severity: corrected
#          Memory failure: 0xaf34214: reserved kernel page still referenced by 1 users
#          [..]
#          Memory failure: 0xaf34214: recovery action for reserved kernel page: Failed
#          mce: Memory error not recovered
#          <reboot>
#     
#       ...and with these changes:
#     
#          Injecting memory failure for pfn 0x20cb00 at process virtual address 0x7f763dd00000
#          Memory failure: 0x20cb00: Killing dax-pmd:5421 due to hardware memory corruption
#          Memory failure: 0x20cb00: recovery action for dax page: Recovered
#     
#       Given all the cross dependencies I propose taking this through
#       nvdimm.git with acks from Naoya, x86/core, x86/RAS, and of course dax
#       folks"
#     
#     * tag 'libnvdimm-for-4.19_dax-memory-failure' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm:
#       libnvdimm, pmem: Restore page attributes when clearing errors
#       x86/memory_failure: Introduce {set, clear}_mce_nospec()
#       x86/mm/pat: Prepare {reserve, free}_memtype() for "decoy" addresses
#       mm, memory_failure: Teach memory_failure() about dev_pagemap pages
#       filesystem-dax: Introduce dax_lock_mapping_entry()
#       mm, memory_failure: Collect mapping size in collect_procs()
#       mm, madvise_inject_error: Let memory_failure() optionally take a page reference
#       mm, dev_pagemap: Do not clear ->mapping on final put
#       mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages
#       filesystem-dax: Set page->index
#       device-dax: Set page->index
#       device-dax: Enable page_mapping()
#       device-dax: Convert to vmf_insert_mixed and vm_fault_t
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < git log --format=%s --max-count=1 2923b27e54242acf27fd16b299e102117c82f52f
# < make -s -j 48 ARCH=arm O=/kisskb/build/linus_orion5x_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  orion5x_defconfig
# make -s -j 48 ARCH=arm O=/kisskb/build/linus_orion5x_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
<stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:129:33: warning: 'levelspread[<U2780>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:96:6: note: 'levelspread[<U2780>]' was declared here
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2511:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1833:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery':
/kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' 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:341:21: note: 'pdeo' was declared here
/kisskb/src/fs/udf/unicode.c: In function 'udf_name_conv_char':
/kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/linus_orion5x_defconfig_arm
# Build took: 0:00:58.644373