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init_vp_index() may access the cpu_online_mask mask via its calls of cpumask_of_node(). Make sure to protect these accesses with a cpus_read_lock() critical section. Also, remove some (hardcoded) instances of CPU(0) from init_vp_index() and replace them with VMBUS_CONNECT_CPU. The connect CPU can not go offline, since Hyper-V does not provide a way to change it. Finally, order the accesses of target_cpu from init_vp_index() and hv_synic_cleanup() by relying on the channel_mutex; this is achieved by moving the call of init_vp_index() into vmbus_process_offer(). Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Link: https://lore.kernel.org/r/20200406001514.19876-10-parri.andrea@gmail.com Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Wei Liu <wei.liu@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.