# 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 # 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-8.5.0-nolibc/hppa-linux/bin/hppa-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux-ld --version # < git log --format=%s --max-count=1 4ba1329cbb9456c937bff1ed8ad4ca91ab75eab6 # < make -s -j 120 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux- generic-32bit_defconfig # < make -s -j 120 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux- help # make -s -j 120 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux- olddefconfig # make -s -j 120 ARCH=parisc O=/kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux- /kisskb/src/arch/parisc/kernel/vdso32/Makefile:30: FORCE prerequisite is missing Completed OK # rm -rf /kisskb/build/linus_generic-32bit_defconfig_parisc-gcc8 # Build took: 0:00:57.290456