# git gc
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# git rev-parse -q --verify d08c407f715f651e7ea40b3a037be46dd2b11e4c^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify d08c407f715f651e7ea40b3a037be46dd2b11e4c^{commit}
d08c407f715f651e7ea40b3a037be46dd2b11e4c
# git checkout -q -f -B kisskb d08c407f715f651e7ea40b3a037be46dd2b11e4c
# git clean -qxdf
# < git log -1
# commit d08c407f715f651e7ea40b3a037be46dd2b11e4c
# Merge: 80a76c60e5f6 8ca1836769d7
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# 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-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-ld --version
# < git log --format=%s --max-count=1 d08c407f715f651e7ea40b3a037be46dd2b11e4c
# make -s -j 24 ARCH=sparc O=/kisskb/build/linus_allmodconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  allmodconfig
# Added to kconfig CONFIG_64BIT=n
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_HAVE_FTRACE_MCOUNT_RECORD=n
# Added to kconfig CONFIG_SAMPLES=n
# Added to kconfig CONFIG_MODULE_SIG=n
# < make -s -j 24 ARCH=sparc O=/kisskb/build/linus_allmodconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  help
# make -s -j 24 ARCH=sparc O=/kisskb/build/linus_allmodconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  olddefconfig
# make -s -j 24 ARCH=sparc O=/kisskb/build/linus_allmodconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  
<stdin>:1519:2: warning: #warning syscall clone3 not implemented [-Wcpp]
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
/kisskb/src/arch/sparc/lib/cmpdi2.c:6:11: error: no previous prototype for '__cmpdi2' [-Werror=missing-prototypes]
 word_type __cmpdi2(long long a, long long b)
           ^
cc1: error: unrecognized command line option '-Wno-shift-negative-value' [-Werror]
cc1: error: unrecognized command line option '-Wno-stringop-overflow' [-Werror]
cc1: all warnings being treated as errors
make[4]: *** [/kisskb/src/scripts/Makefile.build:243: arch/sparc/lib/cmpdi2.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [/kisskb/src/scripts/Makefile.build:481: arch/sparc/lib] Error 2
make[3]: *** Waiting for unfinished jobs....
/kisskb/src/kernel/dma.c:70:5: error: no previous prototype for 'request_dma' [-Werror=missing-prototypes]
 int request_dma(unsigned int dmanr, const char * device_id)
     ^
/kisskb/src/kernel/dma.c:88:6: error: no previous prototype for 'free_dma' [-Werror=missing-prototypes]
 void free_dma(unsigned int dmanr)
      ^
cc1: error: unrecognized command line option '-Wno-shift-negative-value' [-Werror]
cc1: error: unrecognized command line option '-Wno-stringop-overflow' [-Werror]
cc1: all warnings being treated as errors
make[4]: *** [/kisskb/src/scripts/Makefile.build:243: kernel/dma.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [/kisskb/src/scripts/Makefile.build:481: kernel] Error 2
/kisskb/src/drivers/mtd/maps/sun_uflash.c:50:5: error: no previous prototype for 'uflash_devinit' [-Werror=missing-prototypes]
 int uflash_devinit(struct platform_device *op, struct device_node *dp)
     ^
cc1: error: unrecognized command line option '-Wno-shift-negative-value' [-Werror]
cc1: error: unrecognized command line option '-Wno-stringop-overflow' [-Werror]
cc1: all warnings being treated as errors
make[6]: *** [/kisskb/src/scripts/Makefile.build:243: drivers/mtd/maps/sun_uflash.o] Error 1
make[5]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/mtd/maps] Error 2
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [/kisskb/src/scripts/Makefile.build:481: drivers/mtd] 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 24 ARCH=sparc O=/kisskb/build/linus_allmodconfig_sparc64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/sparc64-linux/bin/sparc64-linux-  ' returned non-zero exit status 2.
# rm -rf /kisskb/build/linus_allmodconfig_sparc64-gcc5
# Build took: 0:27:44.455300