This is a follow up to version 1, which can be found here: https://lore.kernel.org/lkml/cover.1729864615.git.namcao@xxxxxxxxxxxxx/ hrtimers must be initialized with a hrtimer_init() variant, and after that the timer's callback function must be setup separately. This seperate initialization is error prone and awkward to use. The seperate initialization is also problematic for a clean Rust abstraction. A combined setup function like timer_setup() is less error prone and simpler to use. This first part of the conversion provides: - a set of hrtimer_setup*() variants, which take the function pointer as argument. - hrtimer_update_function() which allows to change the callback function after initialization with the proper safety checks in place. - conversion of the hrtimer_init*_on_stack() variants - some minor cleanups The remaining users will be converted in follow up series. Most conversions were done with Coccinelle. See sematic patch below. Changes versus v1: - Open code kvm_xen_init_vcpu() (Sean) - Drop the can/bcm patch (Oliver) - Folded the removal of hrtimer_init_sleeper() (tglx) - Update change logs and cover letter The series applies on top of: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core and is also available from git: git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git hrtimer-setup-part1-v2 Best regards, Nam --- virtual patch @@ expression timer, clock, mode, func; @@ - hrtimer_init(timer, clock, mode); ... - timer->function = func; + hrtimer_setup(timer, func, clock, mode); @@ expression timer, clock, mode, func; @@ - hrtimer_init(&timer, clock, mode); ... - timer.function = func; + hrtimer_setup(&timer, func, clock, mode); @@ expression timer, clock, mode, func; @@ - hrtimer_init_on_stack(&timer, clock, mode); ... - timer.function = func; + hrtimer_setup_on_stack(&timer, func, clock, mode); @@ expression timer, clock, mode; @@ - hrtimer_init_sleeper_on_stack(timer, clock, mode); + hrtimer_setup_sleeper_on_stack(timer, clock, mode); --- arch/x86/kvm/xen.c | 12 +-- drivers/gpu/drm/i915/i915_request.c | 17 ++-- drivers/net/wireless/ralink/rt2x00/rt2x00usb.c | 2 - fs/aio.c | 2 +- include/linux/hrtimer.h | 51 +++++++----- include/linux/wait.h | 4 +- io_uring/io_uring.c | 7 +- io_uring/timeout.c | 1 - kernel/futex/core.c | 6 +- kernel/sched/idle.c | 4 +- kernel/time/alarmtimer.c | 9 +- kernel/time/hrtimer.c | 110 ++++++++++++++++++------- kernel/time/sleep_timeout.c | 2 +- net/core/pktgen.c | 2 +- 14 files changed, 136 insertions(+), 93 deletions(-) --- base-commit: 875cf0b1f0eb4fcd9007a0ac0891125d2ce9766b