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5e3be666f4
Document /sys/bus/pci/devices/.../irq. This file contains the IRQ of the INTx interrupt (or zero if the device doesn't support INTx interrupts). If the device has enabled MSI (not MSI-X), it contains the first MSI IRQ instead. This is a historical mistake because devices may support several MSI or MSI-X vectors, and this file can't contain them all. But we preserve this behavior to avoid breaking userspace. [bhelgaas: commit log] Link: https://lore.kernel.org/r/20210825102636.52757-2-21cnbao@gmail.com Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 Restructured Text 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.