f9fe0b89f0
cpu_tss_rw is not directly referenced by hardware, but cpu_tss_rw is accessed in CPU entry code, especially when #DB shifts its stacks. If a data breakpoint would be set on cpu_tss_rw.x86_tss.ist[IST_INDEX_DB], it would cause recursive #DB ending up in a double fault. Add it to the list of protected items. Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200526014221.2119-4-laijs@linux.alibaba.com Link: https://lkml.kernel.org/r/20200529213320.897976479@infradead.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.