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BOOT_CF9_SAFE_STR is an internal value used only by the x86 code and it's not possible to set it from userspace. Remove it, and rename 'cf9_force' to 'pci', so to make it coherent with the kernel command line reboot= option. Tested with this script: cd /sys/kernel/reboot/ for i in cold warm hard soft gpio; do echo $i >mode read j <mode [ $i = $j ] || echo "mode $i != $j" done for i in bios acpi kbd triple efi pci; do echo $i >type read j <type [ $i = $j ] || echo "type $i != $j" done for i in $(seq 0 $(nproc --ignore=1)); do echo $i >cpu read j <cpu [ $i = $j ] || echo "cpu $i != $j" done for i in 0 1; do echo $i >force read j <force [ $i = $j ] || echo "force $i != $j" done Link: https://lkml.kernel.org/r/20201113015900.543923-1-mcroce@linux.microsoft.com Fixes: eab8da48579d ("reboot: allow to specify reboot mode via sysfs") Signed-off-by: Matteo Croce <mcroce@microsoft.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Kees Cook <keescook@chromium.org> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Tyler Hicks <tyhicks@linux.microsoft.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.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.