# git rev-parse -q --verify 458ef2a25e0cbdc216012aa2b9cf549d64133b08^{commit}
458ef2a25e0cbdc216012aa2b9cf549d64133b08
already have revision, skipping fetch
# git checkout -q -f -B kisskb 458ef2a25e0cbdc216012aa2b9cf549d64133b08
# git clean -qxdf
# < git log -1
# commit 458ef2a25e0cbdc216012aa2b9cf549d64133b08
# Merge: 2853d5fafb1e fac01d11722c
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Mar 30 19:55:39 2020 -0700
# 
#     Merge tag 'x86-timers-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull x86 timer updates from Thomas Gleixner:
#      "A series of commits to make the MSR derived CPU and TSC frequency more
#       accurate.
#     
#       It turned out that the frequency tables which have been taken from the
#       SDM are inaccurate because the SDM provides truncated and rounded
#       values, e.g. 83.3Mhz (83.3333...) or 116.7Mhz (116.6666...).
#     
#       This causes time drift in the range of ~1 second per hour (20-30
#       seconds per day). On some of these SoCs it's not possible to
#       recalibrate the TSC because there is no reference (PIT, HPET)
#       available.
#     
#       With some reverse engineering it was established that the possible
#       frequencies are derived from the base clock with fixed multiplier /
#       divider pairs.
#     
#       For the CPU models which have a known crystal frequency the kernel now
#       uses multiplier / divider pairs which bring the frequencies closer to
#       reality and fix the observed time drift issues"
#     
#     * tag 'x86-timers-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
#       x86/tsc_msr: Make MSR derived TSC frequency more accurate
#       x86/tsc_msr: Fix MSR_FSB_FREQ mask for Cherry Trail devices
#       x86/tsc_msr: Use named struct initializers
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-ld --version
# < git log --format=%s --max-count=1 458ef2a25e0cbdc216012aa2b9cf549d64133b08
# < make -s -j 24 ARCH=arm O=/kisskb/build/linus_cerfcube_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  cerfcube_defconfig
# < make -s -j 24 ARCH=arm O=/kisskb/build/linus_cerfcube_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  help
# make -s -j 24 ARCH=arm O=/kisskb/build/linus_cerfcube_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  olddefconfig
# make -s -j 24 ARCH=arm O=/kisskb/build/linus_cerfcube_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return oldval == cmparg;
                 ^
/kisskb/src/kernel/futex.c:1652:6: note: 'oldval' was declared here
  int oldval, ret;
      ^
Completed OK
# rm -rf /kisskb/build/linus_cerfcube_defconfig_arm-gcc4.9
# Build took: 0:00:51.395082