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| author |   Palmer Dabbelt <palmer@rivosinc.com> | 2022-04-14 09:34:29 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-05-11 11:49:54 -0700 |
| commit | 493e2ba27635971565a991dc9f689553242890a4 (patch) | |
| tree | b86081c54b778aa2af78209ab46f99bf9ac947e3 /include/asm-generic | |
| parent | asm-generic: qspinlock: Indicate the use of mixed-size atomics (diff) | |
| download | linux-dev-493e2ba27635971565a991dc9f689553242890a4.tar.xz linux-dev-493e2ba27635971565a991dc9f689553242890a4.zip | |
asm-generic: qrwlock: Document the spinlock fairness requirements
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>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/qrwlock.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-generic/qrwlock.h b/include/asm-generic/qrwlock.h index 7ae0ece07b4e..24ae09c1db9f 100644 --- a/include/asm-generic/qrwlock.h +++ b/include/asm-generic/qrwlock.h @@ -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> |