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b2b2e584ce
When parsing mti,reserved-cpu-vectors we generate a mask of all bits
that have been declared reserved, the loop through starting from bit 2
to find one that isn't reserved (ie. is zero).
This patch accomplishes the same task more simply by:
- Inititialising the reserved mask to 0x3 (ie. the 2 software
interrupts). This means we don't need to skip them later as the loop
previously has.
- Replacing the loop checking for zero bits with find_first_zero_bit,
which fits our needs now that the 2 software interrupts are marked
reserved. This requires that the type of reserved is changed to
unsigned long so that it's suitable for use with bitmap functions.
- Replacing the magic number 8 with the hamming weight of the ST0_IM
field - ie. the number of bits that a MIPS CPU has for interrupt
inputs. This is still a compile-time constant 8, but makes it
clearer why it's 8.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17054/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.