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5fe625c136
Kbuild test robot reports outside array bounds warnings. This is reproducible for ARCH=sh allmodconfig with the kernel.org toolchains available at: https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/8.1.0/x86_64-gcc-8.1.0-nolibc-sh4-linux.tar.xz CC [M] drivers/hwmon/smsc47m1.o drivers/hwmon/smsc47m1.c: In function 'fan_div_store': drivers/hwmon/smsc47m1.c:370:49: warning: array subscript [0, 2] is outside array bounds of 'u8[3]' {aka 'unsigned char[3]'} [-Warray-bounds] tmp = 192 - (old_div * (192 - data->fan_preload[nr]) ~~~~~~~~~~~~~~~~~^~~~ drivers/hwmon/smsc47m1.c:372:19: warning: array subscript [0, 2] is outside array bounds of 'u8[3]' {aka 'unsigned char[3]'} [-Warray-bounds] data->fan_preload[nr] = clamp_val(tmp, 0, 191); ~~~~~~~~~~~~~~~~~^~~~ drivers/hwmon/smsc47m1.c:373:53: warning: array subscript [0, 2] is outside array bounds of 'const u8[3]' {aka 'const unsigned char[3]'} [-Warray-bounds] smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr], ~~~~~~~~~~~~~~~~~~~~~~~~^~~~ Looking at the code, I believe these are false positives. While it is ridiculous to patch our driver to make the insane compiler happy, clarifying the unreachable path will be helpful not only for compilers but also for humans. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> [groeck: Use BUG() instead of unreachable() to make objtool happy] Signed-off-by: Guenter Roeck <linux@roeck-us.net> |
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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.