111b043cdf
The primary reason for this commit is to separate mechanical and nearly mechanical code changes from an upcoming fix for unsafe teardown of shared interrupt handlers that have only filters (see D15905). The technical rationale is that SLIST is sufficient. The only operation that gets worse performance -- O(n) instead of O(1) is a removal of a handler, but it is not a critical operation and the list is expected to be rather short. Additionally, it is easier to reason about SLIST when considering the concurrent lock-free access to the list from the interrupt context and the interrupt thread. CK_SLIST is used because the upcoming change depends on the memory order provided by CK_SLIST insert and the fact that CL_SLIST remove does not trash the linkage in a removed element. While here, I also fixed a couple of whitespace issues, made code under ifdef notyet compilable, added a lock assertion to ithread_update() and made intr_event_execute_handlers() static as it had no external callers. Reviewed by: cem (earlier version) MFC after: 4 weeks Differential Revision: https://reviews.freebsd.org/D16016
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