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[ Upstream commit4a60a3cdcf] For cores less than 4, eg, loongson2k1000 with 2 cores, the of_property_match_string() may return with an error value, which causes that liointc could not work. At least isr0 is what should be checked like previous commitb2c4c3969f("irqchip/loongson-liointc: irqchip add 2.0 version") did. Fixes:0858ed035a("irqchip/loongson-liointc: Add ACPI init support") Signed-off-by: Liu Peibao <liupeibao@loongson.cn> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221104110712.23300-1-liupeibao@loongson.cn Signed-off-by: Sasha Levin <sashal@kernel.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.