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a9aba476d4
linux/rust/kernel
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FUJITA Tomonori a9aba476d4 rust: time: add Delta::to_jiffies_timeout() for timeout conversion 
The boundaries of __msecs_to_jiffies() and nsecs_to_jiffies64() depend
on which HZ branch is compiled. With CONFIG_HZ_300
nsecs_to_jiffies64() overflows after 64.99 years, which is less than
the 292 years a Delta can hold. With HZ=1000 a jiffy is a millisecond,
so __msecs_to_jiffies() returns its argument unchanged and never caps
it at MAX_JIFFY_OFFSET.

Compute the conversion in Rust with mul_u64_add_u64_div_u64() instead. It
returns (a * b + c) / d, computing a * b internally in 128 bits, so
ceil(nanos * HZ / NSEC_PER_SEC) needs no input clamp and rounds once. The
bound then follows from the arithmetic: with HZ <= NSEC_PER_SEC, which a
static_assert() checks, the result is at most the nanosecond count.

Unless the result saturates, the value is rounded up, so the timeout is
never shorter than the requested span. It saturates at zero jiffies for a
negative span, i.e. an immediate timeout, and at MAX_JIFFY_OFFSET, the
upper bound the kernel uses for a jiffies span. Since MAX_JIFFY_OFFSET is
derived from long, only 32 bit can reach it, and a saturated timeout there
is finite, so it can be shorter than the requested span.

Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://msgid.link/20260924232530.446588-3-tomo@flapping.org
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
2026-09-28 17:10:45 +02:00
..
alloc drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
block rust: block: fix GenDisk cleanup paths 2026-05-31 19:45:06 -06:00
debugfs rust: debugfs: remove unsafe blocks from traits impl for Vec 2026-07-31 11:08:29 +02:00
device
drm drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
fs
gpu
interop
io rust: io: register: use path fragment for alias destination 2026-08-03 22:30:32 +02:00
iommu drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
irq rust: irq: make Registration compatible with lifetime-bound drivers 2026-08-04 23:30:34 +02:00
list Locking updates for v7.1: 2026-04-14 12:36:25 -07:00
mm mm: rename zap_page_range_single() to zap_vma_range() 2026-04-05 13:53:15 -07:00
net Char/Misc/IIO/etc driver update for 7.3-rc1 2026-08-25 09:38:50 -07:00
num rust: num: restrict bool conversion to unsigned Bounded 2026-08-24 13:21:12 +02:00
pci rust: pci: reject IRQ vector indices that do not fit in u32 2026-09-01 18:21:01 +02:00
ptr rust: ptr: remove implicit index projection syntax 2026-06-05 10:16:47 +02:00
str
sync Char/Misc/IIO/etc driver update for 7.3-rc1 2026-08-25 09:38:50 -07:00
time rust: time: rename ClockSource trait to ClockId 2026-09-22 16:36:59 +02:00
types rust: types: introduce ForLt base trait for CovariantForLt 2026-07-11 19:42:03 +02:00
.gitignore
acpi.rs rust: driver: store pointers in DeviceId 2026-07-30 22:50:15 +02:00
alloc.rs rust: alloc: cleanup imports and use "kernel vertical" style 2026-05-20 17:34:17 +02:00
auxiliary.rs Driver core changes for 7.3-rc1 2026-08-19 10:42:18 -07:00
bitfield.rs rust: bitfield: always inline test conversions 2026-08-10 06:58:31 +02:00
bitmap.rs rust: tests: add Kconfig for KUnit test 2026-06-08 02:30:33 +02:00
bits.rs
block.rs
bug.rs rust: bug: fix warn_on macro build error on UML 2026-08-10 07:14:24 +02:00
build_assert.rs rust: make build_assert module the home of related macros 2026-06-10 09:07:13 +02:00
clk.rs rust: clk: implement Send and Sync 2026-04-03 11:57:35 +02:00
configfs.rs rust: configfs: use LocalModule for THIS_MODULE 2026-08-12 09:36:26 +02:00
cpu.rs
cpufreq.rs CPUFreq arm updates for 7.3 2026-08-06 13:25:02 +02:00
cpumask.rs
cred.rs
debugfs.rs
device_id.rs rust: driver: remove duplicate ID table 2026-07-30 22:50:15 +02:00
device.rs Linux 7.2-rc7 2026-08-10 01:20:05 +02:00
devres.rs Linux 7.2 2026-08-20 10:58:44 +10:00
dma.rs drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
driver.rs rust: driver: remove open-coded matching logic 2026-07-30 22:50:15 +02:00
error.rs rust: error: add remaining error codes 2026-08-10 07:57:34 +02:00
faux.rs rust: faux: add Device type with AsBusDevice support 2026-07-12 15:55:51 +02:00
firmware.rs drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
fmt.rs rust: fmt: route {:p} through HashedPtr to prevent address leaks 2026-08-12 11:58:50 +02:00
fs.rs
fwctl.rs fwctl 7.3 pull request 2026-08-19 12:51:36 -07:00
generated_arch_reachable_asm.rs.S
generated_arch_static_branch_asm.rs.S
generated_arch_warn_asm.rs.S
gpu.rs
i2c.rs i2c for v7.3, part 2 2026-08-24 09:07:15 -07:00
id_pool.rs
impl_flags.rs rust: impl_flags: use bit helper in example 2026-08-10 06:44:10 +02:00
init.rs rust: treewide: replace __pinned_init with raw_[try_]init 2026-08-05 11:36:18 +01:00
interop.rs
interrupt.rs rust: Introduce interrupt module 2026-08-10 12:53:09 +02:00
io.rs Linux 7.2 2026-08-20 10:58:44 +10:00
ioctl.rs rust: make build_assert module the home of related macros 2026-06-10 09:07:13 +02:00
iov.rs
irq.rs rust: irq: fix C header path in module docs 2026-07-21 00:48:45 +02:00
jump_label.rs rust: jump_label: skip arch-specific asm in testlib builds 2026-08-23 21:27:16 +02:00
Kconfig.test rust: time: add Delta::to_jiffies_timeout() for timeout conversion 2026-09-28 17:10:45 +02:00
kunit.rs kunit,rust: Add ability to skip entire test suites 2026-06-29 15:48:26 -06:00
lib.rs fwctl 7.3 pull request 2026-08-19 12:51:36 -07:00
list.rs rust: kernel: list: fix incorrect pop_back example comment 2026-08-23 21:27:16 +02:00
maple_tree.rs
miscdevice.rs Char/Misc/IIO/etc driver update for 7.3-rc1 2026-08-25 09:38:50 -07:00
mm.rs
module_param.rs rust: module_param: support bool parameters 2026-08-06 13:29:03 +02:00
module.rs rust: module: add THIS_MODULE const to ModuleMetadata trait 2026-08-12 09:36:26 +02:00
num.rs rust: add functions and traits for lossless integer conversions 2026-08-13 13:41:28 +02:00
of.rs rust: driver: store pointers in DeviceId 2026-07-30 22:50:15 +02:00
opp.rs opp: rust: mark OPP methods as inline 2026-05-25 09:40:52 +05:30
page.rs mm.git review status for mm-hotfixes-stable..mm-stable 2026-06-19 10:14:34 -07:00
pci.rs drm for 7.3-rc1 2026-08-21 08:41:00 -07:00
pid_namespace.rs
platform.rs Driver core changes for 7.3-rc1 2026-08-19 10:42:18 -07:00
prelude.rs rust: prelude: add zerocopy{,_derive}::IntoBytes 2026-06-17 00:32:42 +02:00
print.rs rust: print: fix broken _printk Rustdoc link 2026-08-03 08:03:24 +02:00
processor.rs
ptr.rs rust: io: add dynamically-sized Region type 2026-07-11 17:42:56 +02:00
pwm.rs pwm: Changes for v7.3-rc1 2026-08-19 09:03:59 -07:00
rbtree.rs
regulator.rs rust: regulator: do not assume that regulator_get() returns non-null 2026-03-24 13:08:21 +00:00
revocable.rs rust: revocable: Use LKMM atomics instead of Rust atomics 2026-08-04 05:52:54 -07:00
safety.rs
scatterlist.rs
security.rs
seq_file.rs
serdev.rs Driver core changes for 7.3-rc1 2026-08-19 10:42:18 -07:00
sizes.rs rust: sizes: add SizeConstants trait for device address space constants 2026-04-07 12:57:50 +02:00
soc.rs
std_vendor.rs
str.rs rust: str: clean unused import for Rust >= 1.98 2026-06-10 09:07:13 +02:00
sync.rs RCU updates: 2026-08-23 18:00:22 -07:00
task.rs Char/Misc/IIO/etc driver update for 7.3-rc1 2026-08-25 09:38:50 -07:00
time.rs rust: time: add Delta::to_jiffies_timeout() for timeout conversion 2026-09-28 17:10:45 +02:00
tracepoint.rs
transmute.rs rust: transmute: simplify code with Rust 1.80.0 split_at_*checked() 2026-04-07 10:00:24 +02:00
types.rs Driver core changes for 7.3-rc1 2026-08-19 10:42:18 -07:00
uaccess.rs Char/Misc/IIO/and others driver updates for 7.1-rc1 2026-04-24 13:23:50 -07:00
usb.rs USB / Thunderbolt changes for 7.3-rc1 2026-08-25 10:44:46 -07:00
workqueue.rs rust: workqueue: use new sync::aref path for imports 2026-03-26 15:45:34 +00:00
xarray.rs rust: make build_assert module the home of related macros 2026-06-10 09:07:13 +02:00