rcu: Use this_cpu_{read,write}() for ->cpu_no_qs.b.exp

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Currently __this_cpu_read() and __this_cpu_write() is used to access the
->cpu_no_qs.b.exp field of the per-CPU rcu_data structure.  However,
this can fail when the accesses can happen in interrupt handlers, as
recently started being exercised by rcutorture.  This commit therefore
upgrades the uses of __this_cpu_read() and __this_cpu_write() to their
interrupt-safe counterparts this_cpu_read() and this_cpu_write().

KCSAN located this issue.

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

...

This commit is contained in:

Paul E. McKenney 2026-07-16 12:53:56 -07:00

parent d972d10696

commit d2282f9bc7

2 changed files with 4 additions and 4 deletions

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4

kernel/rcu/tree_exp.h

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4

kernel/rcu/tree_plugin.h

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