0ec208ce98
The current code loops over the psi_states only to call a helper which then resolves back to the action needed for each state using a switch statement. That is effectively creating a double indirection of a kind which, given how all the states need to be explicitly listed and handled anyway, we can simply remove. Both the for loop and the switch statement that is. The benefit is both in the code size and CPU time spent in this function. YMMV but on my Steam Deck, while in a game, the patch makes the CPU usage go from ~2.4% down to ~1.2%. Text size at the same time went from 0x323 to 0x2c1. Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Chengming Zhou <chengming.zhou@linux.dev> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Link: https://lkml.kernel.org/r/20240625135000.38652-1-tursulin@igalia.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 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.