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7778c4b27c
This patch avoids the need to read the GIC_SH_MASK* registers when decoding shared interrupts by setting & clearing the interrupt's bit in the appropriate CPU's pcpu_masks entry when masking or unmasking the interrupt. This effectively means that whilst an interrupt is masked we clear its bit in all pcpu_masks, which causes gic_handle_shared_int() to ignore it on all CPUs without needing to check GIC_SH_MASK*. In essence, we add a little overhead to masking or unmasking interrupts but in return reduce the overhead of the far more common task of decoding interrupts. 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/17109/ 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.