# git gc
# git rev-parse -q --verify b1fbfcb4a20949df08dd995927cdc5ad220c128d^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
# git rev-parse -q --verify b1fbfcb4a20949df08dd995927cdc5ad220c128d^{commit}
b1fbfcb4a20949df08dd995927cdc5ad220c128d
# git checkout -q -f -B kisskb b1fbfcb4a20949df08dd995927cdc5ad220c128d
# git clean -qxdf
# < git log -1
# commit b1fbfcb4a20949df08dd995927cdc5ad220c128d
# Author: Masahiro Yamada <yamada.masahiro@socionext.com>
# Date:   Mon Nov 18 13:52:47 2019 +0900
# 
#     kbuild: make single target builds even faster
#     
#     Commit 2dffd23f81a3 ("kbuild: make single target builds much faster")
#     made the situation much better.
#     
#     To improve it even more, apply the similar idea to the top Makefile.
#     Trim unrelated directories from build-dirs.
#     
#     The single build code must be moved above the 'descend' target.
#     
#     Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
#     Tested-by: Jens Axboe <axboe@kernel.dk>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-ld --version
# < git log --format=%s --max-count=1 b1fbfcb4a20949df08dd995927cdc5ad220c128d
# < make -s -j 48 ARCH=ia64 O=/kisskb/build/kbuild_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-  defconfig
# make -s -j 48 ARCH=ia64 O=/kisskb/build/kbuild_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler':
/kisskb/src/mm/vmstat.c:90:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/nfs/read.c: In function 'nfs_read_completion':
/kisskb/src/fs/nfs/read.c:196:5: warning: value computed is not used [-Wunused-value]
/kisskb/src/fs/nfs/read.c: In function 'nfs_readpage':
/kisskb/src/fs/nfs/read.c:352:2: warning: value computed is not used [-Wunused-value]
/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:338:21: note: 'pdeo' was declared here
/kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc':
/kisskb/src/fs/nfsd/nfs4xdr.c:2076:9: warning: 'str' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1496:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/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]
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
No errors detected in 21712 functions.
Completed OK
# rm -rf /kisskb/build/kbuild_ia64-defconfig_ia64
# Build took: 0:09:17.819400