# git rev-parse -q --verify de5cb0dcb74c294ec527eddfe5094acfdb21ff21^{commit}
de5cb0dcb74c294ec527eddfe5094acfdb21ff21
already have revision, skipping fetch
# git checkout -q -f -B kisskb de5cb0dcb74c294ec527eddfe5094acfdb21ff21
# git clean -qxdf
# < git log -1
# commit de5cb0dcb74c294ec527eddfe5094acfdb21ff21
# Merge: af9c191ac2a0 533ab223aa1a
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Sep 22 11:19:35 2024 -0700
# 
#     Merge branch 'address-masking'
#     
#     Merge user access fast validation using address masking.
#     
#     This allows architectures to optionally use a data dependent address
#     masking model instead of a conditional branch for validating user
#     accesses.  That avoids the Spectre-v1 speculation barriers.
#     
#     Right now only x86-64 takes advantage of this, and not all architectures
#     will be able to do it.  It requires a guard region between the user and
#     kernel address spaces (so that you can't overflow from one to the
#     other), and an easy way to generate a guaranteed-to-fault address for
#     invalid user pointers.
#     
#     Also note that this currently assumes that there is no difference
#     between user read and write accesses.  If extended to architectures like
#     powerpc, we'll also need to separate out the user read-vs-write cases.
#     
#     * address-masking:
#       x86: make the masked_user_access_begin() macro use its argument only once
#       x86: do the user address masking outside the user access area
#       x86: support user address masking instead of non-speculative conditional
# < /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 de5cb0dcb74c294ec527eddfe5094acfdb21ff21
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64le_defconfig
Using /kisskb/src/arch/powerpc/configs/ppc64_defconfig as base
Merging /kisskb/src/arch/powerpc/configs/le.config
#
# merged configuration written to .config (needs make)
#
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_ppc64le_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_ppc64le_defconfig_powerpc-gcc5
# Build took: 0:01:55.210138