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1b7bbd5975
Avoid 64-bit integer division that 32-bit architectures don't implement generally. This uses ktime_to_us() and ktime_to_ms() instead. The time abstraction needs i64 / u32 division so C's div_s64() can be used but ktime_to_us() and ktime_to_ms() provide a simpler solution for this time abstraction problem on 32-bit architectures. 32-bit ARM is the only 32-bit architecture currently supported by Rust. Using the cfg attribute, only 32-bit architectures will call ktime_to_us() and ktime_to_ms(), while the other 64-bit architectures will continue to use the current code as-is to avoid the overhead. One downside of calling the C's functions is that the as_micros/millis methods can no longer be const fn. We stick with the simpler approach unless there's a compelling need for a const fn. Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Link: https://lore.kernel.org/r/20250502004524.230553-1-fujita.tomonori@gmail.com Signed-off-by: Andreas Hindborg <a.hindborg@kernel.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 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.