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d44f1b8dd7
To split up APEIs in_nmi() path, the caller needs to always be in_nmi(). Add a helper to do the work and claim the notification. When KVM or the arch code takes an exception that might be a RAS notification, it asks the APEI firmware-first code whether it wants to claim the exception. A future kernel-first mechanism may be queried afterwards, and claim the notification, otherwise we fall through to the existing default behaviour. The NOTIFY_SEA code was merged before considering multiple, possibly interacting, NMI-like notifications and the need to consider kernel first in the future. Make the 'claiming' behaviour explicit. Restructuring the APEI code to allow multiple NMI-like notifications means any notification that might interrupt interrupts-masked code must always be wrapped in nmi_enter()/nmi_exit(). This will allow APEI to use in_nmi() to use the right fixmap entries. Mask SError over this window to prevent an asynchronous RAS error arriving and tripping 'nmi_enter()'s BUG_ON(in_nmi()). Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Tyler Baicar <tbaicar@codeaurora.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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.