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When do 'echo 1 > /proc/sys/abi/swp' on two cpus at the same time, we can see: call_undef_hook() at traps.c:442 do_undefinstr() at traps.c:504 el0_undef() at entry-common.c:605 el0t_64_sync_handler() at entry-common.c:689 el0t_64_sync() at entry.S:585 That is because write swp 1 at the same time, add the swp_hooks to the undef_hook list twice, swp_hooks list node's next becomes itself. When list_for_each_entry of the undef_hook, cpu loops forever here. Change-Id: Ice60dbc633020220e7218a554e9d0e4c7dacceb4 Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
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.