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efi: Allow to expose the workqueue via sysfs

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Exposing the efi_rts_wq workqueue via sysfs provides an easy mechanism
to restrict EFI firmware invocation to certain CPU(s).
This can be used to restrict EFI invocations to specific CPUs while
allowing other workqueue to use the remaning CPUs.

Expose the workqueue via sysfs. Change the name to efi_runtime which is
what will be visible under sysfs.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior
2026-02-27 18:01:03 +01:00
committed by Tejun Heo
parent a4aa8d94f2
commit 0bd96853ba
1 changed files with 1 additions and 1 deletions
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drivers/firmware/efi/efi.c
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@@ -423,7 +423,7 @@ static int __init efisubsys_init(void)
* ordered workqueue (which creates only one execution context)
* should suffice for all our needs.
*/
efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
efi_rts_wq = alloc_ordered_workqueue("efi_runtime", WQ_SYSFS);
if (!efi_rts_wq) {
pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);