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cd9140ad83
Explicitly check for an in-kernel PIC when checking for a pending ExtINT in the PIC. Effectively swapping the split vs. full irqchip logic will allow guarding the in-kernel I/O APIC (and PIC) emulation with a Kconfig, and also makes it more obvious that kvm_pic_read_irq() won't result in a NULL pointer dereference. Opportunistically add WARNs in the fallthrough path, mostly to document that the userspace ExtINT logic is only relevant to split IRQ chips. Acked-by: Kai Huang <kai.huang@intel.com> Link: https://lore.kernel.org/r/20250611213557.294358-13-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.