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The local TLB flushing code keeps an additional mask in the mm.context, the cpu_attach_mask. At the time a global flush of an address space is done the cpu_attach_mask is copied to the mm_cpumask in order to avoid future global flushes in case the mm is used by a single CPU only after the flush. Trouble is that the reset of the mm_cpumask is racy against the detach of an mm address space by switch_mm. The current order is first the global TLB flush and then the copy of the cpu_attach_mask to the mm_cpumask. The order needs to be the other way around. Cc: <stable@vger.kernel.org> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.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.