# git rev-parse -q --verify e41b93a6be57e26a4a123345f826a6ac3a213551^{commit}
e41b93a6be57e26a4a123345f826a6ac3a213551
already have revision, skipping fetch
# git checkout -q -f -B kisskb e41b93a6be57e26a4a123345f826a6ac3a213551
# git clean -qxdf
# < git log -1
# commit e41b93a6be57e26a4a123345f826a6ac3a213551
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon Dec 3 19:55:55 2018 +1100
# 
#     powerpc/boot: Fix build failures with -j 1
#     
#     In commit 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to
#     wrapper") we added a dependency to serial.c on autoconf.h:
#     
#       $(obj)/serial.c: $(obj)/autoconf.h
#     
#     This works when building in-tree (ie. with KBUILD_OUTPUT unset)
#     because the obj tree is the src tree.
#     
#     But when building with eg. O=build and -j 1 the build fails:
#     
#       gcc ... -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o arch/powerpc/boot/serial.c
#       gcc: error: arch/powerpc/boot/serial.c: No such file or directory
#     
#     Why this is only happening with -j 1 is not clear, when building with
#     -j greater than 1 somehow we decide to look for serial.c in the src
#     tree (../), eg:
#     
#       gcc -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o ../arch/powerpc/boot/serial.c
#     
#     Regardless we shouldn't be specifying a dependency on serial.c in the
#     build tree, we want to add a dependency to the version in $(srctree)
#     so fix the rule to say that.
#     
#     Fixes: 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to wrapper")
#     Tested-by: Daniel Axtens <dja@axtens.net>
#     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
# < git log --format=%s --max-count=1 e41b93a6be57e26a4a123345f826a6ac3a213551
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_obs600_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/obs600_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_obs600_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_40x.S:883: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x4b1e24) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-4.20.0-rc1-ge41b93a6be57
Created:      Fri Dec  7 20:07:12 2018
Image Type:   PowerPC Linux Multi-File Image (gzip compressed)
Data Size:    2415574 Bytes = 2358.96 KiB = 2.30 MiB
Load Address: 00000000
Entry Point:  00000000
Contents:
   Image 0: 2408687 Bytes = 2352.23 KiB = 2.30 MiB
   Image 1: 3 Bytes = 0.00 KiB = 0.00 MiB
   Image 2: 6866 Bytes = 6.71 KiB = 0.01 MiB
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_40x_obs600_defconfig_powerpc-gcc5
# Build took: 0:00:39.305993