# git rev-parse -q --verify 8dcd71b45df34d9b903450fab147ee8c1e6c16b5^{commit}
8dcd71b45df34d9b903450fab147ee8c1e6c16b5
already have revision, skipping fetch
# git checkout -q -f -B kisskb 8dcd71b45df34d9b903450fab147ee8c1e6c16b5
# git clean -qxdf
# < git log -1
# commit 8dcd71b45df34d9b903450fab147ee8c1e6c16b5
# Author: Nathan Chancellor <natechancellor@gmail.com>
# Date:   Mon Nov 18 21:57:12 2019 -0700
# 
#     powerpc/prom_init: Use -ffreestanding to avoid a reference to bcmp
#     
#     LLVM revision r374662 gives LLVM the ability to convert certain loops
#     into a reference to bcmp as an optimization; this breaks
#     prom_init_check.sh:
#     
#         CALL    arch/powerpc/kernel/prom_init_check.sh
#       Error: External symbol 'bcmp' referenced from prom_init.c
#       make[2]: *** [arch/powerpc/kernel/Makefile:196: prom_init_check] Error 1
#     
#     bcmp is defined in lib/string.c as a wrapper for memcmp so this could
#     be added to the whitelist. However, commit
#     450e7dd4001f ("powerpc/prom_init: don't use string functions from
#     lib/") copied memcmp as prom_memcmp to avoid KASAN instrumentation so
#     having bcmp be resolved to regular memcmp would break that assumption.
#     Furthermore, because the compiler is the one that inserted bcmp, we
#     cannot provide something like prom_bcmp.
#     
#     To prevent LLVM from being clever with optimizations like this, use
#     -ffreestanding to tell LLVM we are not hosted so it is not free to
#     make transformations like this.
#     
#     Reviewed-by: Nick Desaulneris <ndesaulniers@google.com>
#     Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191119045712.39633-4-natechancellor@gmail.com
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 8dcd71b45df34d9b903450fab147ee8c1e6c16b5
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  ps3_defconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/ipc/shm.c: In function 'ksys_shmdt':
/kisskb/src/ipc/shm.c:1712:59: warning: 'file' may be used uninitialized in this function [-Wuninitialized]
/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/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<Ue780>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<Ue780>]' was declared here
/kisskb/src/net/bluetooth/hidp/core.c: In function 'hidp_connection_add':
/kisskb/src/net/bluetooth/hidp/core.c:1386:18: warning: 'session' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/core/gen_stats.c: In function '__gnet_stats_copy_basic':
/kisskb/src/net/core/gen_stats.c:157:19: warning: 'seq' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/mpi/mpicoder.c: In function 'mpi_read_raw_from_sgl':
/kisskb/src/lib/mpi/mpicoder.c:352:8: warning: 'buff' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/cifs/smb2pdu.c: In function 'SMB2_ioctl_init':
/kisskb/src/fs/cifs/smb2pdu.c:2703:19: warning: 'in_data_buf' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/core/dev.c: In function 'validate_xmit_skb_list':
/kisskb/src/net/core/dev.c:3407:15: warning: 'tail' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/rhashtable.c: In function 'rht_deferred_worker':
/kisskb/src/include/linux/rhashtable.h:110:10: warning: 'next' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/rhashtable.c:222:28: note: 'next' was declared here
/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/splice.c: In function '__do_compat_sys_vmsplice':
/kisskb/src/fs/splice.c:1394:8: warning: 'type' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/splice.c: In function '__do_sys_vmsplice':
/kisskb/src/fs/splice.c:1368:8: warning: 'type' 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]
/kisskb/src/net/wireless/nl80211.c: In function 'nl80211_vendor_cmd_dump':
/kisskb/src/net/wireless/nl80211.c:13138:33: warning: 'wdev' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/wireless/nl80211.c:13108:21: warning: 'rdev' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/tx.c: In function 'ieee80211_build_hdr':
/kisskb/src/net/mac80211/tx.c:2519:27: warning: 'chanctx_conf' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1576:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1533:6: note: 'pwr_level_cisco' was declared here
Completed OK
# rm -rf /kisskb/build/powerpc-next_ps3_defconfig_powerpc-gcc4.6
# Build took: 0:01:35.584636