# git rev-parse -q --verify d08c407f715f651e7ea40b3a037be46dd2b11e4c^{commit} d08c407f715f651e7ea40b3a037be46dd2b11e4c already have revision, skipping fetch # git checkout -q -f -B kisskb d08c407f715f651e7ea40b3a037be46dd2b11e4c # git clean -qxdf # < git log -1 # commit d08c407f715f651e7ea40b3a037be46dd2b11e4c # Merge: 80a76c60e5f6 8ca1836769d7 # Author: Linus Torvalds # Date: Mon Mar 11 14:38:26 2024 -0700 # # Merge tag 'timers-core-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip # # Pull timer updates from Thomas Gleixner: # "A large set of updates and features for timers and timekeeping: # # - The hierarchical timer pull model # # When timer wheel timers are armed they are placed into the timer # wheel of a CPU which is likely to be busy at the time of expiry. # This is done to avoid wakeups on potentially idle CPUs. # # This is wrong in several aspects: # # 1) The heuristics to select the target CPU are wrong by # definition as the chance to get the prediction right is # close to zero. # # 2) Due to #1 it is possible that timers are accumulated on # a single target CPU # # 3) The required computation in the enqueue path is just overhead # for dubious value especially under the consideration that the # vast majority of timer wheel timers are either canceled or # rearmed before they expire. # # The timer pull model avoids the above by removing the target # computation on enqueue and queueing timers always on the CPU on # which they get armed. # # This is achieved by having separate wheels for CPU pinned timers # and global timers which do not care about where they expire. # # As long as a CPU is busy it handles both the pinned and the global # timers which are queued on the CPU local timer wheels. # # When a CPU goes idle it evaluates its own timer wheels: # # - If the first expiring timer is a pinned timer, then the global # timers can be ignored as the CPU will wake up before they # expire. # # - If the first expiring timer is a global timer, then the expiry # time is propagated into the timer pull hierarchy and the CPU # makes sure to wake up for the first pinned timer. # # The timer pull hierarchy organizes CPUs in groups of eight at the # lowest level and at the next levels groups of eight groups up to # the point where no further aggregation of groups is required, i.e. # the number of levels is log8(NR_CPUS). The magic number of eight # has been established by experimention, but can be adjusted if # needed. # # In each group one busy CPU acts as the migrator. It's only one CPU # to avoid lock contention on remote timer wheels. # # The migrator CPU checks in its own timer wheel handling whether # there are other CPUs in the group which have gone idle and have # global timers to expire. If there are global timers to expire, the # migrator locks the remote CPU timer wheel and handles the expiry. # # Depending on the group level in the hierarchy this handling can # require to walk the hierarchy downwards to the CPU level. # # Special care is taken when the last CPU goes idle. At this point # the CPU is the systemwide migrator at the top of the hierarchy and # it therefore cannot delegate to the hierarchy. It needs to arm its # own timer device to expire either at the first expiring timer in # the hierarchy or at the first CPU local timer, which ever expires # first. # # This completely removes the overhead from the enqueue path, which # is e.g. for networking a true hotpath and trades it for a slightly # more complex idle path. # # This has been in development for a couple of years and the final # series has been extensively tested by various teams from silicon # vendors and ran through extensive CI. # # There have been slight performance improvements observed on network # centric workloads and an Intel team confirmed that this allows them # to power down a die completely on a mult-die socket for the first # time in a mostly idle scenario. # # There is only one outstanding ~1.5% regression on a specific # overloaded netperf test which is currently investigated, but the # rest is either positive or neutral performance wise and positive on # the power management side. # # - Fixes for the timekeeping interpolation code for cross-timestamps: # # cross-timestamps are used for PTP to get snapshots from hardware # timers and interpolated them back to clock MONOTONIC. The changes # address a few corner cases in the interpolation code which got the # math and logic wrong. # # - Simplifcation of the clocksource watchdog retry logic to # automatically adjust to handle larger systems correctly instead of # having more incomprehensible command line parameters. # # - Treewide consolidation of the VDSO data structures. # # - The usual small improvements and cleanups all over the place" # # * tag 'timers-core-2024-03-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (62 commits) # timer/migration: Fix quick check reporting late expiry # tick/sched: Fix build failure for CONFIG_NO_HZ_COMMON=n # vdso/datapage: Quick fix - use asm/page-def.h for ARM64 # timers: Assert no next dyntick timer look-up while CPU is offline # tick: Assume timekeeping is correctly handed over upon last offline idle call # tick: Shut down low-res tick from dying CPU # tick: Split nohz and highres features from nohz_mode # tick: Move individual bit features to debuggable mask accesses # tick: Move got_idle_tick away from common flags # tick: Assume the tick can't be stopped in NOHZ_MODE_INACTIVE mode # tick: Move broadcast cancellation up to CPUHP_AP_TICK_DYING # tick: Move tick cancellation up to CPUHP_AP_TICK_DYING # tick: Start centralizing tick related CPU hotplug operations # tick/sched: Don't clear ts::next_tick again in can_stop_idle_tick() # tick/sched: Rename tick_nohz_stop_sched_tick() to tick_nohz_full_stop_tick() # tick: Use IS_ENABLED() whenever possible # tick/sched: Remove useless oneshot ifdeffery # tick/nohz: Remove duplicate between lowres and highres handlers # tick/nohz: Remove duplicate between tick_nohz_switch_to_nohz() and tick_setup_sched_timer() # hrtimer: Select housekeeping CPU during migration # ... # < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux-ld --version # < git log --format=%s --max-count=1 d08c407f715f651e7ea40b3a037be46dd2b11e4c # make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux- allmodconfig # Added to kconfig CONFIG_BUILD_DOCSRC=n # Added to kconfig CONFIG_MODULE_SIG=n # Added to kconfig CONFIG_SAMPLES=n # < make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux- help # make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux- olddefconfig # make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux- Generating include/generated/machtypes.h :1519:2: warning: #warning syscall clone3 not implemented [-Wcpp] /kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S: Assembler messages: /kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:85: Warning: overflow in branch to __restore_all; converted into longer instruction sequence /kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:357: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence /kisskb/src/arch/sh/kernel/cpu/sh2/../../entry-common.S:360: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence /kisskb/src/arch/sh/math-emu/math.c:492:5: error: no previous prototype for 'do_fpu_inst' [-Werror=missing-prototypes] 492 | int do_fpu_inst(unsigned short inst, struct pt_regs *regs) | ^~~~~~~~~~~ /kisskb/src/arch/sh/mm/nommu.c:76:13: error: no previous prototype for 'kmap_coherent_init' [-Werror=missing-prototypes] 76 | void __init kmap_coherent_init(void) | ^~~~~~~~~~~~~~~~~~ /kisskb/src/arch/sh/mm/cache-sh2.c:85:13: error: no previous prototype for 'sh2_cache_init' [-Werror=missing-prototypes] 85 | void __init sh2_cache_init(void) | ^~~~~~~~~~~~~~ /kisskb/src/arch/sh/mm/nommu.c:80:7: error: no previous prototype for 'kmap_coherent' [-Werror=missing-prototypes] 80 | void *kmap_coherent(struct page *page, unsigned long addr) | ^~~~~~~~~~~~~ /kisskb/src/arch/sh/mm/nommu.c:86:6: error: no previous prototype for 'kunmap_coherent' [-Werror=missing-prototypes] 86 | void kunmap_coherent(void *kvaddr) | ^~~~~~~~~~~~~~~ cc1: all warnings being treated as errors make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/mm/nommu.o] Error 1 make[5]: *** Waiting for unfinished jobs.... cc1: all warnings being treated as errors make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/mm/cache-sh2.o] Error 1 make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/mm] Error 2 make[4]: *** Waiting for unfinished jobs.... cc1: all warnings being treated as errors make[5]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/math-emu/math.o] Error 1 make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/math-emu] Error 2 /kisskb/src/arch/sh/kernel/cpu/init.c:99:29: error: no previous prototype for 'l2_cache_init' [-Werror=missing-prototypes] 99 | void __attribute__ ((weak)) l2_cache_init(void) | ^~~~~~~~~~~~~ cc1: all warnings being treated as errors make[6]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sh/kernel/cpu/init.o] Error 1 make[6]: *** Waiting for unfinished jobs.... make[5]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/kernel/cpu] Error 2 make[4]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh/kernel] Error 2 make[3]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sh] Error 2 make[3]: *** Waiting for unfinished jobs.... {standard input}: Assembler messages: {standard input}:1094: Warning: end of file not at end of a line; newline inserted {standard input}:1095: Error: expected symbol name sh4-linux-gcc: internal compiler error: Segmentation fault signal terminated program cc1 Please submit a full bug report, with preprocessed source (by using -freport-bug). See for instructions. make[6]: *** [/kisskb/src/scripts/Makefile.build:243: drivers/net/pcs/pcs-xpcs.o] Error 4 make[5]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/net/pcs] Error 2 make[5]: *** Waiting for unfinished jobs.... make[4]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/net] Error 2 make[4]: *** Waiting for unfinished jobs.... make[3]: *** [/kisskb/src/scripts/Makefile.build:481: drivers] Error 2 make[2]: *** [/kisskb/src/Makefile:1921: .] Error 2 make[1]: *** [/kisskb/src/Makefile:240: __sub-make] Error 2 make: *** [Makefile:240: __sub-make] Error 2 Command 'make -s -j 160 ARCH=sh O=/kisskb/build/linus_allmodconfig_sh4-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/sh4-linux/bin/sh4-linux- ' returned non-zero exit status 2. # rm -rf /kisskb/build/linus_allmodconfig_sh4-gcc13 # Build took: 0:04:52.009616