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locking/qspinlock: Clarify pending field layout

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For CONFIG_NR_CPUS < 16K, _Q_PENDING_BITS is 8 and the pending
field occupies bits 8-15 of the lock word. The current comment
documents bit 8 as pending and bits 9-15 as unused, which describes
the pending flag value rather than the field layout.

Describe bits 8-15 as the pending byte so the layout description
is consistent with the lock byte.

Signed-off-by: WEI-HONG, YE <1234567weewee457@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://patch.msgid.link/20260525130450.723937-1-1234567weewee457@gmail.com
This commit is contained in:
WEI-HONG, YE
2026-05-25 13:04:50 +00:00
committed by Peter Zijlstra
parent b64b19fa1a
commit cb19b8a9ad
1 changed files with 1 additions and 2 deletions
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3
include/asm-generic/qspinlock_types.h
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@@ -53,8 +53,7 @@ typedef struct qspinlock {
*
* When NR_CPUS < 16K
* 0- 7: locked byte
* 8: pending
* 9-15: not used
* 8-15: pending byte
* 16-17: tail index
* 18-31: tail cpu (+1)
*