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114e0a6847
Core code disables RCU when calling arch_cpu_idle(), so it's not safe for arch_cpu_idle() or its calees to be instrumented, as the instrumentation callbacks may attempt to use RCU or other features which are unsafe to use in this context. Mark them noinstr to prevent issues. The use of local_irq_enable() in arch_cpu_idle() is similarly problematic, and the "sched/idle: Fix arch_cpu_idle() vs tracing" patch queued in the tip tree addresses that case. Reported-by: Marco Elver <elver@google.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20201130115950.22492-3-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
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.