rds: Use nested-BH locking for rds_page_remainder

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rds_page_remainder is a per-CPU variable and relies on disabled BH for its
locking. Without per-CPU locking in local_bh_disable() on PREEMPT_RT
this data structure requires explicit locking.

Add a local_lock_t to the data structure and use
local_lock_nested_bh() for locking. This change adds only lockdep
coverage and does not alter the functional behaviour for !PREEMPT_RT.

Cc: Allison Henderson <allison.henderson@oracle.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20250512092736.229935-16-bigeasy@linutronix.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Sebastian Andrzej Siewior 2025-05-12 11:27:36 +02:00 • committed by Paolo Abeni

parent 0af5928f35

commit c50d295c37

1 changed files with 8 additions and 2 deletions

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net/rds/page.c

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