# git rev-parse -q --verify 81429eb8d9ca40b0c65bb739d29fa856c5d5e958^{commit}
81429eb8d9ca40b0c65bb739d29fa856c5d5e958
already have revision, skipping fetch
# git checkout -q -f -B kisskb 81429eb8d9ca40b0c65bb739d29fa856c5d5e958
# git clean -qxdf
# < git log -1
# commit 81429eb8d9ca40b0c65bb739d29fa856c5d5e958
# Merge: be5fa3aac23f e50be648aaa3
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Nov 21 12:15:24 2019 -0800
# 
#     Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
#     
#     Pull arm64 fix from Will Deacon:
#      "Ensure PAN is re-enabled following user fault in uaccess routines.
#     
#       After I thought we were done for 5.4, we had a report this week of a
#       nasty issue that has been shown to leak data between different user
#       address spaces thanks to corruption of entries in the TLB. In
#       hindsight, we should have spotted this in review when the PAN code was
#       merged back in v4.3, but hindsight is 20/20 and I'm trying not to beat
#       myself up too much about it despite being fairly miserable.
#     
#       Anyway, the fix is "obvious" but the actual failure is more more
#       subtle, and is described in the commit message. I've included a fairly
#       mechanical follow-up patch here as well, which moves this checking out
#       into the C wrappers which is what we do for {get,put}_user() already
#       and allows us to remove these bloody assembly macros entirely. The
#       patches have passed kernelci [1] [2] [3] and CKI [4] tests over night,
#       as well as some targetted testing [5] for this particular issue.
#     
#       The first patch is tagged for stable and should be applied to 4.14,
#       4.19 and 5.3. I have separate backports for 4.4 and 4.9, which I'll
#       send out once this has landed in your tree (although the original
#       patch applies cleanly, it won't build for those two trees).
#     
#       Thanks to Pavel Tatashin for reporting this and Mark Rutland for
#       helping to diagnose the issue and review/test the solution"
#     
#     * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
#       arm64: uaccess: Remove uaccess_*_not_uao asm macros
#       arm64: uaccess: Ensure PAN is re-enabled after unhandled uaccess fault
# < /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 81429eb8d9ca40b0c65bb739d29fa856c5d5e958
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  44x/fsp2_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_44x_fsp2_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x956ee0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0xa00000)
Image Name:   Linux-5.4.0-rc8-g81429eb8d9ca
Created:      Fri Nov 22 08:32:13 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    4203313 Bytes = 4104.80 KiB = 4.01 MiB
Load Address: 00000000
Entry Point:  00000000
Completed OK
# rm -rf /kisskb/build/linus_44x_fsp2_defconfig_powerpc-gcc5
# Build took: 0:01:15.866603