# git rev-parse -q --verify 8ff468c29e9a9c3afe9152c10c7b141343270bf3^{commit}
8ff468c29e9a9c3afe9152c10c7b141343270bf3
already have revision, skipping fetch
# git checkout -q -f -B kisskb 8ff468c29e9a9c3afe9152c10c7b141343270bf3
# git clean -qxdf
# < git log -1
# commit 8ff468c29e9a9c3afe9152c10c7b141343270bf3
# Merge: 68253e718c27 d9c9ce34ed5c
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue May 7 10:24:10 2019 -0700
# 
#     Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull x86 FPU state handling updates from Borislav Petkov:
#      "This contains work started by Rik van Riel and brought to fruition by
#       Sebastian Andrzej Siewior with the main goal to optimize when to load
#       FPU registers: only when returning to userspace and not on every
#       context switch (while the task remains in the kernel).
#     
#       In addition, this optimization makes kernel_fpu_begin() cheaper by
#       requiring registers saving only on the first invocation and skipping
#       that in following ones.
#     
#       What is more, this series cleans up and streamlines many aspects of
#       the already complex FPU code, hopefully making it more palatable for
#       future improvements and simplifications.
#     
#       Finally, there's a __user annotations fix from Jann Horn"
#     
#     * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (29 commits)
#       x86/fpu: Fault-in user stack if copy_fpstate_to_sigframe() fails
#       x86/pkeys: Add PKRU value to init_fpstate
#       x86/fpu: Restore regs in copy_fpstate_to_sigframe() in order to use the fastpath
#       x86/fpu: Add a fastpath to copy_fpstate_to_sigframe()
#       x86/fpu: Add a fastpath to __fpu__restore_sig()
#       x86/fpu: Defer FPU state load until return to userspace
#       x86/fpu: Merge the two code paths in __fpu__restore_sig()
#       x86/fpu: Restore from kernel memory on the 64-bit path too
#       x86/fpu: Inline copy_user_to_fpregs_zeroing()
#       x86/fpu: Update xstate's PKRU value on write_pkru()
#       x86/fpu: Prepare copy_fpstate_to_sigframe() for TIF_NEED_FPU_LOAD
#       x86/fpu: Always store the registers in copy_fpstate_to_sigframe()
#       x86/entry: Add TIF_NEED_FPU_LOAD
#       x86/fpu: Eager switch PKRU state
#       x86/pkeys: Don't check if PKRU is zero before writing it
#       x86/fpu: Only write PKRU if it is different from current
#       x86/pkeys: Provide *pkru() helpers
#       x86/fpu: Use a feature number instead of mask in two more helpers
#       x86/fpu: Make __raw_xsave_addr() use a feature number instead of mask
#       x86/fpu: Add an __fpregs_load_activate() internal helper
#       ...
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 8ff468c29e9a9c3afe9152c10c7b141343270bf3
# < make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  randconfig
KCONFIG_SEED=0xF3E76BAA
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# yes \n | make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 80 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc8
# Build took: 0:03:06.462057