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[ Upstream commit 2ef3886ce626dcdab0cbc452dbbebc19f57133d8 ] The PCI Local Bus Specification 3.0 (section 6.8.1.6) allows modifying the low-order bits of the MSI Message DATA register to encode nr_irqs interrupt numbers in the log2(nr_irqs) bits for the domain. The problem arises if the base vector (GICV2m base spi) is not aligned with nr_irqs; in this case, the low-order log2(nr_irqs) bits from the base vector conflict with the nr_irqs masking, causing the wrong MSI interrupt to be identified. To fix this, use bitmap_find_next_zero_area_off() instead of bitmap_find_free_region() to align the initial base vector with nr_irqs. Signed-off-by: Christian Bruel <christian.bruel@foss.st.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/all/20250902091045.220847-1-christian.bruel@foss.st.com Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.