This is a note to let you know that I've just added the patch titled genirq: Remove WARN_ON_ONCE() in generic_handle_domain_irq() to the 5.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: genirq-remove-warn_on_once-in-generic_handle_domain_irq.patch and it can be found in the queue-5.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 792ea6a074ae7ea5ab6f1b8b31f76bb0297de66c Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas@xxxxxxxxx> Date: Tue, 10 May 2022 09:56:05 +0200 Subject: genirq: Remove WARN_ON_ONCE() in generic_handle_domain_irq() From: Lukas Wunner <lukas@xxxxxxxxx> commit 792ea6a074ae7ea5ab6f1b8b31f76bb0297de66c upstream. Since commit 0953fb263714 ("irq: remove handle_domain_{irq,nmi}()"), generic_handle_domain_irq() warns if called outside hardirq context, even though the function calls down to handle_irq_desc(), which warns about the same, but conditionally on handle_enforce_irqctx(). The newly added warning is a false positive if the interrupt originates from any other irqchip than x86 APIC or ARM GIC/GICv3. Those are the only ones for which handle_enforce_irqctx() returns true. Per commit c16816acd086 ("genirq: Add protection against unsafe usage of generic_handle_irq()"): "In general calling generic_handle_irq() with interrupts disabled from non interrupt context is harmless. For some interrupt controllers like the x86 trainwrecks this is outright dangerous as it might corrupt state if an interrupt affinity change is pending." Examples for interrupt chips where the warning is a false positive are USB-attached GPIO controllers such as drivers/gpio/gpio-dln2.c: USB gadgets are incapable of directly signaling an interrupt because they cannot initiate a bus transaction by themselves. All communication on the bus is initiated by the host controller, which polls a gadget's Interrupt Endpoint in regular intervals. If an interrupt is pending, that information is passed up the stack in softirq context, from which a hardirq is synthesized via generic_handle_domain_irq(). Remove the warning to eliminate such false positives. Fixes: 0953fb263714 ("irq: remove handle_domain_{irq,nmi}()") Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Jakub Kicinski <kuba@xxxxxxxxxx> CC: Linus Walleij <linus.walleij@xxxxxxxxxx> Cc: Bartosz Golaszewski <brgl@xxxxxxxx> Cc: Octavian Purdila <octavian.purdila@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20220505113207.487861b2@xxxxxxxxxx Link: https://lore.kernel.org/r/20220506203242.GA1855@xxxxxxxxx Link: https://lore.kernel.org/r/c3caf60bfa78e5fdbdf483096b7174da65d1813a.1652168866.git.lukas@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/irq/irqdesc.c | 1 - 1 file changed, 1 deletion(-) --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -678,7 +678,6 @@ EXPORT_SYMBOL_GPL(generic_handle_irq); */ int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq) { - WARN_ON_ONCE(!in_irq()); return handle_irq_desc(irq_resolve_mapping(domain, hwirq)); } EXPORT_SYMBOL_GPL(generic_handle_domain_irq); Patches currently in stable-queue which might be from lukas@xxxxxxxxx are queue-5.17/genirq-remove-warn_on_once-in-generic_handle_domain_irq.patch