# git rev-parse -q --verify e3d773ddb5a1140780a15703b3e0e2618274cce9^{commit}
e3d773ddb5a1140780a15703b3e0e2618274cce9
already have revision, skipping fetch
# git checkout -q -f -B kisskb e3d773ddb5a1140780a15703b3e0e2618274cce9
# git clean -qxdf
# < git log -1
# commit e3d773ddb5a1140780a15703b3e0e2618274cce9
# Author: Jordan Niethe <jniethe5@gmail.com>
# Date:   Thu Feb 25 14:19:46 2021 +1100
# 
#     powerpc/sstep: Fix VSX instruction emulation
#     
#     Commit af99da74333b ("powerpc/sstep: Support VSX vector paired storage
#     access instructions") added loading and storing 32 word long data into
#     adjacent VSRs. However the calculation used to determine if two VSRs
#     needed to be loaded/stored inadvertently prevented the load/storing
#     taking place for instructions with a data length less than 16 words.
#     
#     This causes the emulation to not function correctly, which can be seen
#     by the alignment_handler selftest:
#     
#     $ ./alignment_handler
#     [snip]
#     test: test_alignment_handler_vsx_207
#     tags: git_version:powerpc-5.12-1-0-g82d2c16b350f
#     VSX: 2.07B
#             Doing lxsspx:   PASSED
#             Doing lxsiwax:  FAILED: Wrong Data
#             Doing lxsiwzx:  PASSED
#             Doing stxsspx:  PASSED
#             Doing stxsiwx:  PASSED
#     failure: test_alignment_handler_vsx_207
#     test: test_alignment_handler_vsx_300
#     tags: git_version:powerpc-5.12-1-0-g82d2c16b350f
#     VSX: 3.00B
#             Doing lxsd:     PASSED
#             Doing lxsibzx:  PASSED
#             Doing lxsihzx:  PASSED
#             Doing lxssp:    FAILED: Wrong Data
#             Doing lxv:      PASSED
#             Doing lxvb16x:  PASSED
#             Doing lxvh8x:   PASSED
#             Doing lxvx:     PASSED
#             Doing lxvwsx:   FAILED: Wrong Data
#             Doing lxvl:     PASSED
#             Doing lxvll:    PASSED
#             Doing stxsd:    PASSED
#             Doing stxsibx:  PASSED
#             Doing stxsihx:  PASSED
#             Doing stxssp:   PASSED
#             Doing stxv:     PASSED
#             Doing stxvb16x: PASSED
#             Doing stxvh8x:  PASSED
#             Doing stxvx:    PASSED
#             Doing stxvl:    PASSED
#             Doing stxvll:   PASSED
#     failure: test_alignment_handler_vsx_300
#     [snip]
#     
#     Fix this by making sure all VSX instruction emulation correctly
#     load/store from the VSRs.
#     
#     Fixes: af99da74333b ("powerpc/sstep: Support VSX vector paired storage access instructions")
#     Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
#     Reviewed-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20210225031946.1458206-1-jniethe5@gmail.com
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 e3d773ddb5a1140780a15703b3e0e2618274cce9
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64e_defconfig
# < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0xd2a104) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0xe00000)
Image Name:   Linux-5.12.0-rc1-ge3d773ddb5a1
Created:      Mon Mar  1 23:43:48 2021
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    5302450 Bytes = 5178.17 KiB = 5.06 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ppc64e_defconfig_powerpc-gcc5
# Build took: 0:01:14.175202