linux-kernel - [PATCH 2/2] efi: Allow to expose the workqueue via sysfs

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Message-ID: <20260205115559.1625236-3-bigeasy@linutronix.de>
Date: Thu,  5 Feb 2026 12:55:59 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev
Cc: "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	John Ogness <john.ogness@...utronix.de>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Tejun Heo <tj@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 2/2] efi: Allow to expose the workqueue via sysfs

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@...utronix.de>
---
 drivers/firmware/efi/efi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 17b5f3415465e..96c47dbb743a7 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -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);
-- 
2.51.0