# git rev-parse -q --verify 4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6^{commit}
4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6
# git clean -qxdf
# < git log -1
# commit 4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6
# Merge: 7fb5e5083190 4f2bfd9494a0
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Fri Jul 22 10:01:20 2022 -0700
# 
#     Merge tag 'rcu-urgent.2022.07.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
#     
#     Pull RCU fix from Paul McKenney:
#      "This contains a pair of commits that fix 282d8998e997 ("srcu: Prevent
#       expedited GPs and blocking readers from consuming CPU"), which was
#       itself a fix to an SRCU expedited grace-period problem that could
#       prevent kernel live patching (KLP) from completing.
#     
#       That SRCU fix for KLP introduced large (as in minutes) boot-time
#       delays to embedded Linux kernels running on qemu/KVM. These delays
#       were due to the emulation of certain MMIO operations controlling
#       memory layout, which were emulated with one expedited grace period per
#       access. Common configurations required thousands of boot-time MMIO
#       accesses, and thus thousands of boot-time expedited SRCU grace
#       periods.
#     
#       In these configurations, the occasional sleeps that allowed KLP to
#       proceed caused excessive boot delays. These commits preserve enough
#       sleeps to permit KLP to proceed, but few enough that the virtual
#       embedded kernels still boot reasonably quickly.
#     
#       This represents a regression introduced in the v5.19 merge window, and
#       the bug is causing significant inconvenience"
#     
#     * tag 'rcu-urgent.2022.07.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
#       srcu: Make expedited RCU grace periods block even less frequently
#       srcu: Block less aggressively for expedited grace periods
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6
# < make -s -j 120 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  allmodconfig
# < make -s -j 120 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  help
# make -s -j 120 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  olddefconfig
# make -s -j 120 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_arm64-allmodconfig_arm64-gcc11
# Build took: 0:10:31.352612