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asm-generic: qrwlock: Document the spinlock fairness requirements

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I could only find the fairness requirements documented as the C code,
this calls them out in a comment just to be a bit more explicit.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2022-04-14 09:34:29 -07:00
parent a8ad07e524
commit 493e2ba276
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4
include/asm-generic/qrwlock.h
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@ -2,6 +2,10 @@
/*
* Queue read/write lock
*
* These use generic atomic and locking routines, but depend on a fair spinlock
* implementation in order to be fair themselves. The implementation in
* asm-generic/spinlock.h meets these requirements.
*
* (C) Copyright 2013-2014 Hewlett-Packard Development Company, L.P.
*
* Authors: Waiman Long <waiman.long@hp.com>