rcu: Mark interrupts-enabled accesses to rdp->cpu_no_qs.b.norm

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The rdp->cpu_no_qs.b.norm field is accessed only by the current CPU,
but can be accessed both at task level and from interrupt handlers.
All accesses from interrupts-enabled code must therefore be marked.
This commit therefore converts from __this_cpu_read() to this_cpu_read(),
from __this_cpu_write() to this_cpu_write(), and plain C-language accesses
to READ_ONCE() and WRITE_ONCE(), but only in interrupts-enabled code.

KCSAN located this issue.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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This commit is contained in:

Paul E. McKenney 2026-07-21 21:03:06 -07:00

parent 2aaee3fc84

commit 8fe479568c

2 changed files with 5 additions and 5 deletions

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2

kernel/rcu/tree.c

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8

kernel/rcu/tree_plugin.h

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