# git rev-parse -q --verify 4b78317679c4f3782a3cff0ddb269c1fcfde7621^{commit}
4b78317679c4f3782a3cff0ddb269c1fcfde7621
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4b78317679c4f3782a3cff0ddb269c1fcfde7621
# git clean -qxdf
# < git log -1
# commit 4b78317679c4f3782a3cff0ddb269c1fcfde7621
# Merge: 880584176ed7 55a974021ec9
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Dec 1 12:35:48 2018 -0800
# 
#     Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull STIBP fallout fixes from Thomas Gleixner:
#      "The performance destruction department finally got it's act together
#       and came up with a cure for the STIPB regression:
#     
#        - Provide a command line option to control the spectre v2 user space
#          mitigations. Default is either seccomp or prctl (if seccomp is
#          disabled in Kconfig). prctl allows mitigation opt-in, seccomp
#          enables the migitation for sandboxed processes.
#     
#        - Rework the code to handle the conditional STIBP/IBPB control and
#          remove the now unused ptrace_may_access_sched() optimization
#          attempt
#     
#        - Disable STIBP automatically when SMT is disabled
#     
#        - Optimize the switch_to() logic to avoid MSR writes and invocations
#          of __switch_to_xtra().
#     
#        - Make the asynchronous speculation TIF updates synchronous to
#          prevent stale mitigation state.
#     
#       As a general cleanup this also makes retpoline directly depend on
#       compiler support and removes the 'minimal retpoline' option which just
#       pretended to provide some form of security while providing none"
#     
#     * 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits)
#       x86/speculation: Provide IBPB always command line options
#       x86/speculation: Add seccomp Spectre v2 user space protection mode
#       x86/speculation: Enable prctl mode for spectre_v2_user
#       x86/speculation: Add prctl() control for indirect branch speculation
#       x86/speculation: Prepare arch_smt_update() for PRCTL mode
#       x86/speculation: Prevent stale SPEC_CTRL msr content
#       x86/speculation: Split out TIF update
#       ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS
#       x86/speculation: Prepare for conditional IBPB in switch_mm()
#       x86/speculation: Avoid __switch_to_xtra() calls
#       x86/process: Consolidate and simplify switch_to_xtra() code
#       x86/speculation: Prepare for per task indirect branch speculation control
#       x86/speculation: Add command line control for indirect branch speculation
#       x86/speculation: Unify conditional spectre v2 print functions
#       x86/speculataion: Mark command line parser data __initdata
#       x86/speculation: Mark string arrays const correctly
#       x86/speculation: Reorder the spec_v2 code
#       x86/l1tf: Show actual SMT state
#       x86/speculation: Rework SMT state change
#       sched/smt: Expose sched_smt_present static key
#       ...
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < git log --format=%s --max-count=1 4b78317679c4f3782a3cff0ddb269c1fcfde7621
# < make -s -j 48 ARCH=arm O=/kisskb/build/linus_mainstone_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  mainstone_defconfig
# make -s -j 48 ARCH=arm O=/kisskb/build/linus_mainstone_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/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:341:21: note: 'pdeo' was declared here
Completed OK
# rm -rf /kisskb/build/linus_mainstone_defconfig_arm
# Build took: 0:00:35.351599