Commit c0149a03 authored by Kumar Kartikeya Dwivedi's avatar Kumar Kartikeya Dwivedi Committed by Alexei Starovoitov
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locking: Allow obtaining result of arch_mcs_spin_lock_contended 



To support upcoming changes that require inspecting the return value
once the conditional waiting loop in arch_mcs_spin_lock_contended
terminates, modify the macro to preserve the result of
smp_cond_load_acquire. This enables checking the return value as needed,
which will help disambiguate the MCS node’s locked state in future
patches.

Reviewed-by: default avatarBarret Rhoden <brho@google.com>
Signed-off-by: default avatarKumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250316040541.108729-4-memxor@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent ac08f68f

kernel/locking/mcs_spinlock.h

+1 −3
Original line number Diff line number Diff line
@@ -24,9 +24,7 @@ 
 * spinning, and smp_cond_load_acquire() provides that behavior.

 */

#define arch_mcs_spin_lock_contended(l)					\

do {									\

	smp_cond_load_acquire(l, VAL);					\

} while (0)

	smp_cond_load_acquire(l, VAL)

#endif



#ifndef arch_mcs_spin_unlock_contended