linux-kernel - Re: [PATCH 1/1] um: virt-pci: Switch to msi_create_parent_irq

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Message-ID: <20250627095328.ce5O9YWf@linutronix.de>
Date: Fri, 27 Jun 2025 11:53:28 +0200
From: Nam Cao <namcao@...utronix.de>
To: Johannes Berg <johannes@...solutions.net>
Cc: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Richard Weinberger <richard@....at>,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] um: virt-pci: Switch to
 msi_create_parent_irq_domain()

On Fri, Jun 27, 2025 at 11:49:03AM +0200, Nam Cao wrote:
> My understanding of UM is limited, but I think I get it. We dereference a
> NULL pointer and get SIGSEGV. We go into that code path and lockdep yells.
> 
> With the NULL pointer deref removed, we won't go into that path, so it
> should be good.

By "that code path" I mean SIGSEGV handler.

Nam