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ARC cores on reset have all interrupt lines of built-in INTC enabled. Which means once we globally enable interrupts (very early on boot) faulty hardware blocks may trigger an interrupt that Linux kernel cannot handle yet as corresponding handler is not yet installed. In that case system falls in "interrupt storm" and basically never does anything useful except entering and exiting generic IRQ handling code. One real example of that kind of problematic hardware is DW GMAC which also has interrupts enabled on reset and if Ethernet PHY informs GMAC about link state, GMAC immediately reports that upstream to ARC core and here we are. Now with that change we mask all individual IRQ lines making entire system more fool-proof. [This patch was motivated by Adaptrum platform support] Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Eugeniy Paltsev <paltsev@synopsys.com> Tested-by: Alexandru Gagniuc <alex.g@adaptrum.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> |
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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.