[PATCH v3 00/51] cpuidle,rcu: Clean up the mess

Peter Zijlstra
2023-01-12T20:05:22Z

Hi All!

The (hopefully) final respin of cpuidle vs rcu cleanup patches. Barring any
objections I'll be queueing these patches in tip/sched/core in the next few
days.

v2: https://lkml.kernel.org/r/20220919095939.761690562@infradead.org

These here patches clean up the mess that is cpuidle vs rcuidle.

At the end of the ride there's only on RCU_NONIDLE user left:

arch/arm64/kernel/suspend.c: RCU_NONIDLE(__cpu_suspend_exit());

And I know Mark has been prodding that with something sharp.

The last version was tested by a number of people and I'm hoping to not have
broken anything in the meantime ;-)

Changes since v2:

- rebased to v6.2-rc3; as available at:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/idle

- folded: https://lkml.kernel.org/r/Y3UBwYNY15ETUKy9@hirez.programming.kicks-ass.net
which makes the ARM cpuidle index 0 consistently not use
CPUIDLE_FLAG_RCU_IDLE, as requested by Ulf.

- added a few more __always_inline to empty stub functions as found by the
robot.

- Used _RET_IP_ instead of _THIS_IP_ in a few placed because of:
https://github.com/ClangBuiltLinux/linux/issues/263

- Added new patches to address various robot reports:

#35: trace,hardirq: No moar _rcuidle() tracing
#47: cpuidle: Ensure ct_cpuidle_enter() is always called from noinstr/__cpuidle
#48: cpuidle,arch: Mark all ct_cpuidle_enter() callers __cpuidle
#49: cpuidle,arch: Mark all regular cpuidle_state::enter methods __cpuidle
#50: cpuidle: Comments about noinstr/__cpuidle
#51: context_tracking: Fix noinstr vs KASAN

---
arch/alpha/kernel/process.c | 1 -
arch/alpha/kernel/vmlinux.lds.S | 1 -
arch/arc/kernel/process.c | 3 ++
arch/arc/kernel/vmlinux.lds.S | 1 -
arch/arm/include/asm/vmlinux.lds.h | 1 -
arch/arm/kernel/cpuidle.c | 4 +-
arch/arm/kernel/process.c | 1 -
arch/arm/kernel/smp.c | 6 +--
arch/arm/mach-davinci/cpuidle.c | 4 +-
arch/arm/mach-gemini/board-dt.c | 3 +-
arch/arm/mach-imx/cpuidle-imx5.c | 4 +-
arch/arm/mach-imx/cpuidle-imx6q.c | 8 ++--
arch/arm/mach-imx/cpuidle-imx6sl.c | 4 +-
arch/arm/mach-imx/cpuidle-imx6sx.c | 9 ++--
arch/arm/mach-imx/cpuidle-imx7ulp.c | 4 +-
arch/arm/mach-omap2/common.h | 6 ++-
arch/arm/mach-omap2/cpuidle34xx.c | 16 ++++++-
arch/arm/mach-omap2/cpuidle44xx.c | 29 +++++++------
arch/arm/mach-omap2/omap-mpuss-lowpower.c | 12 +++++-
arch/arm/mach-omap2/pm.h | 2 +-
arch/arm/mach-omap2/pm24xx.c | 51 +---------------------
arch/arm/mach-omap2/pm34xx.c | 14 +++++--
arch/arm/mach-omap2/pm44xx.c | 2 +-
arch/arm/mach-omap2/powerdomain.c | 10 ++---
arch/arm/mach-s3c/cpuidle-s3c64xx.c | 5 +--
arch/arm64/kernel/cpuidle.c | 2 +-
arch/arm64/kernel/idle.c | 1 -
arch/arm64/kernel/smp.c | 4 +-
arch/arm64/kernel/vmlinux.lds.S | 1 -
arch/csky/kernel/process.c | 1 -
arch/csky/kernel/smp.c | 2 +-
arch/csky/kernel/vmlinux.lds.S | 1 -
arch/hexagon/kernel/process.c | 1 -
arch/hexagon/kernel/vmlinux.lds.S | 1 -
arch/ia64/kernel/process.c | 1 +
arch/ia64/kernel/vmlinux.lds.S | 1 -
arch/loongarch/kernel/idle.c | 1 +
arch/loongarch/kernel/vmlinux.lds.S | 1 -
arch/m68k/kernel/vmlinux-nommu.lds | 1 -
arch/m68k/kernel/vmlinux-std.lds | 1 -
arch/m68k/kernel/vmlinux-sun3.lds | 1 -
arch/microblaze/kernel/process.c | 1 -
arch/microblaze/kernel/vmlinux.lds.S | 1 -
arch/mips/kernel/idle.c | 14 +++----
arch/mips/kernel/vmlinux.lds.S | 1 -
arch/nios2/kernel/process.c | 1 -
arch/nios2/kernel/vmlinux.lds.S | 1 -
arch/openrisc/kernel/process.c | 1 +
arch/openrisc/kernel/vmlinux.lds.S | 1 -
arch/parisc/kernel/process.c | 2 -
arch/parisc/kernel/vmlinux.lds.S | 1 -
arch/powerpc/kernel/idle.c | 5 +--
arch/powerpc/kernel/vmlinux.lds.S | 1 -
arch/riscv/kernel/process.c | 1 -
arch/riscv/kernel/vmlinux-xip.lds.S | 1 -
arch/riscv/kernel/vmlinux.lds.S | 1 -
arch/s390/kernel/idle.c | 1 -
arch/s390/kernel/vmlinux.lds.S | 1 -
arch/sh/kernel/idle.c | 1 +
arch/sh/kernel/vmlinux.lds.S | 1 -
arch/sparc/kernel/leon_pmc.c | 4 ++
arch/sparc/kernel/process_32.c | 1 -
arch/sparc/kernel/process_64.c | 3 +-
arch/sparc/kernel/vmlinux.lds.S | 1 -
arch/um/kernel/dyn.lds.S | 1 -
arch/um/kernel/process.c | 1 -
arch/um/kernel/uml.lds.S | 1 -
arch/x86/boot/compressed/vmlinux.lds.S | 1 +
arch/x86/coco/tdx/tdcall.S | 15 +------
arch/x86/coco/tdx/tdx.c | 25 ++++-------
arch/x86/events/amd/brs.c | 13 +++---
arch/x86/include/asm/fpu/xcr.h | 4 +-
arch/x86/include/asm/irqflags.h | 11 ++---
arch/x86/include/asm/mwait.h | 14 +++----
arch/x86/include/asm/nospec-branch.h | 2 +-
arch/x86/include/asm/paravirt.h | 6 ++-
arch/x86/include/asm/perf_event.h | 2 +-
arch/x86/include/asm/shared/io.h | 4 +-
arch/x86/include/asm/shared/tdx.h | 1 -
arch/x86/include/asm/special_insns.h | 8 ++--
arch/x86/include/asm/xen/hypercall.h | 2 +-
arch/x86/kernel/cpu/bugs.c | 2 +-
arch/x86/kernel/fpu/core.c | 4 +-
arch/x86/kernel/paravirt.c | 14 ++++++-
arch/x86/kernel/process.c | 65 ++++++++++++++--------------
arch/x86/kernel/vmlinux.lds.S | 1 -
arch/x86/lib/memcpy_64.S | 5 +--
arch/x86/lib/memmove_64.S | 4 +-
arch/x86/lib/memset_64.S | 4 +-
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/irq.c | 2 +-
arch/xtensa/kernel/process.c | 1 +
arch/xtensa/kernel/vmlinux.lds.S | 1 -
drivers/acpi/processor_idle.c | 28 ++++++++-----
drivers/base/power/runtime.c | 24 +++++------
drivers/clk/clk.c | 8 ++--
drivers/cpuidle/cpuidle-arm.c | 4 +-
drivers/cpuidle/cpuidle-big_little.c | 12 ++++--
drivers/cpuidle/cpuidle-mvebu-v7.c | 13 ++++--
drivers/cpuidle/cpuidle-psci.c | 26 +++++-------
drivers/cpuidle/cpuidle-qcom-spm.c | 4 +-
drivers/cpuidle/cpuidle-riscv-sbi.c | 19 +++++----
drivers/cpuidle/cpuidle-tegra.c | 31 +++++++++-----
drivers/cpuidle/cpuidle.c | 70 ++++++++++++++++++++++---------
drivers/cpuidle/dt_idle_states.c | 2 +-
drivers/cpuidle/poll_state.c | 10 ++++-
drivers/idle/intel_idle.c | 19 ++++-----
drivers/perf/arm_pmu.c | 11 +----
drivers/perf/riscv_pmu_sbi.c | 8 +---
include/asm-generic/vmlinux.lds.h | 9 ++--
include/linux/clockchips.h | 4 +-
include/linux/compiler_types.h | 18 +++++++-
include/linux/cpu.h | 3 --
include/linux/cpuidle.h | 32 ++++++++++++++
include/linux/cpumask.h | 4 +-
include/linux/percpu-defs.h | 2 +-
include/linux/sched/idle.h | 40 +++++++++++++-----
include/linux/thread_info.h | 18 +++++++-
include/linux/tracepoint.h | 15 ++++++-
kernel/context_tracking.c | 12 +++---
kernel/cpu_pm.c | 9 ----
kernel/printk/printk.c | 2 +-
kernel/sched/idle.c | 47 ++++++---------------
kernel/time/tick-broadcast-hrtimer.c | 29 ++++++-------
kernel/time/tick-broadcast.c | 6 ++-
kernel/trace/trace.c | 3 ++
kernel/trace/trace_preemptirq.c | 50 ++++++----------------
lib/ubsan.c | 5 ++-
mm/kasan/kasan.h | 4 ++
mm/kasan/shadow.c | 38 +++++++++++++++++
tools/objtool/check.c | 17 ++++++++
131 files changed, 617 insertions(+), 523 deletions(-)