KeLowerIrql function (wdm.h)

Article
02/22/2024

The KeLowerIrql routine restores the IRQL on the current processor to its original value. For information about IRQLs, see Managing Hardware Priorities.

Syntax

void KeLowerIrql(
  [in] KIRQL NewIrql
);

Parameters

[in] NewIrql

Specifies the IRQL that was returned from KeRaiseIrql or KeRaiseIrqlToDpcLevel.

Return value

None

Remarks

It is a fatal error to call KeLowerIrql using an input NewIrql that was not returned by the immediately preceding call to KeRaiseIrql or KeRaiseIrqlToDpcLevel.

Requirements

Requirement	Value
Minimum supported client	Available starting with Windows 2000.
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	Hal.lib
DLL	NtosKrnl.exe
IRQL	Any level
DDI compliance rules	HwStorPortProhibitedDDIs(storport), IrqlKeRaiseLower(wdm), IrqlKeRaiseLower2(wdm)