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1b83a9f41b
The kernel test robot reports the following error when building on Hexagon with hexagon-allmodconfig. ERROR: modpost: "__hexagon_divdi3" [drivers/media/platform/amlogic/c3/mipi-csi2/c3-mipi-csi2.ko] undefined! The error is caused by using DIV_ROUND_UP() with a 64 bits divisor with a 32-bit dividend, which on Hexagon and clang-17 is resolved with a call to the __hexagon_divdi3() helper function, part of the compiler support library and not available when building Linux. Use DIV_ROUND_UP_ULL() to fix the build error and avoid calling the __hexagon_divdi3() helper function. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202505101334.UHxNcUUO-lkp@intel.com/ Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
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 reStructuredText 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.