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[0/6] sched: Cleanup task_struct::state

Message ID 20210602131225.336600299@infradead.org (mailing list archive)
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Series sched: Cleanup task_struct::state | expand


Peter Zijlstra June 2, 2021, 1:12 p.m. UTC

The task_struct::state variable is a bit odd in a number of ways:

 - it's declared 'volatile' (against current practises);
 - it's 'unsigned long' which is a weird size;
 - it's type is inconsistent when used for function arguments.

These patches clean that up by making it consistently 'unsigned int', and
replace (almost) all accesses with READ_ONCE()/WRITE_ONCE(). In order to not
miss any, the variable is renamed, ensuring a missed conversion results in a
compile error.

The first few patches fix a number of pre-existing errors and introduce a few
helpers to make the final conversion less painful.