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When a CPU is hotplugged, cpu_active_mask is modified without any RCU synchronization. As a result, the only synchronization for cpu_active_mask provided by the hotplug code is the CPU hotplug lock. Furthermore, since IRQ balance is majorly disrupted during CPU hotplug due to mass IRQ migration off a dying CPU, SBalance just shouldn't operate while a CPU hotplug is in progress. Take the CPU hotplug lock in balance_irqs() to prevent races and mishaps during CPU hotplugs. Change-Id: If377de7b78e3ae68a20bc95bdb84650330cfc330 Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com> Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
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.