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60f07c8ec5
The order in __tlb_flush_mm_lazy is to flush TLB first and then clear the mm->context.flush_mm bit. This can lead to missed flushes as the bit can be set anytime, the order needs to be the other way aronud. But this leads to a different race, __tlb_flush_mm_lazy may be called on two CPUs concurrently. If mm->context.flush_mm is cleared first then another CPU can bypass __tlb_flush_mm_lazy although the first CPU has not done the flush yet. In a virtualized environment the time until the flush is finally completed can be arbitrarily long. Add a spinlock to serialize __tlb_flush_mm_lazy and use the function in finish_arch_post_lock_switch as well. Cc: <stable@vger.kernel.org> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
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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.