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timer: cortex_m_systick: Compilation error if CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME is defined #100040

Closed
Bug
#100043
Closed
timer: cortex_m_systick: Compilation error if CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME is defined#100040
Bug
#100043
Assignees
ydamigos
Labels
RegressionSomething, which was working, does not anymorearea: ARMARM (32-bit) ArchitecturebugThe issue is a bug, or the PR is fixing a bugpriority: mediumMedium impact/importance bug

Description

@ydamigos
ydamigos
opened on Nov 25, 2025

Describe the bug

Timer cortex_m_systick fails to build if CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME is defined

Regression of commit b9a39a7

Regression

  • This is a regression.

Steps to reproduce

west build -p -b qemu_cortex_m3 samples/hello_world -- -DCONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME=y

Relevant log output

/home/user/projects/zephyrproject/zephyr/drivers/timer/cortex_m_systick.c:23:48: error: division by zero in #if
   23 | #define CYC_PER_TICK (z_clock_hw_cycles_per_sec/CONFIG_SYS_CLOCK_TICKS_PER_SEC)
      |                                                ^
/home/user/projects/zephyrproject/zephyr/drivers/timer/cortex_m_systick.c:33:20: note: in expansion of macro 'CYC_PER_TICK'
   33 | #if (COUNTER_MAX / CYC_PER_TICK) == 1

Impact

Not sure

Environment

v4.30 Release

Additional Context

No response

Activity

  1. ydamigos
    added
    bugThe issue is a bug, or the PR is fixing a bug
    on Nov 25, 2025
  2. ydamigos
    added the
    Bug
    issue type on Nov 25, 2025
  3. ydamigos
    self-assigned this
    on Nov 25, 2025
  4. henrikbrixandersen
    added
    area: ARMARM (32-bit) Architecture
    RegressionSomething, which was working, does not anymore
    on Nov 25, 2025
  5. nashif
    added
    priority: mediumMedium impact/importance bug
    on Nov 25, 2025
  6. nashif
    closed this as completedin #100043on Dec 5, 2025
  7. devops-soa-ci
    added a commit that references this issue on Dec 5, 2025

    drivers/timer/cortex_m_systick: Avoid division by zero

    cc4bc45
  8. github-actions
    added a commit that references this issue on Feb 2, 2026

    drivers/timer/cortex_m_systick: Avoid division by zero

    6360997
  9. cfriedt
    added a commit that references this issue on Mar 15, 2026

    drivers/timer/cortex_m_systick: Avoid division by zero

    739668a
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Labels

RegressionSomething, which was working, does not anymorearea: ARMARM (32-bit) ArchitecturebugThe issue is a bug, or the PR is fixing a bugpriority: mediumMedium impact/importance bug

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