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Lacking this, the rqspinlock code falls back to using smp_cond_load_acquire(). Cc: Kumar Kartikeya Dwivedi Cc: Alexei Starovoitov Cc: bpf@vger.kernel.org Reviewed-by: Catalin Marinas Reviewed-by: Haris Okanovic Acked-by: Kumar Kartikeya Dwivedi Reviewed-by: Christoph Lameter (Ampere) Tested-by: Haris Okanovic Signed-off-by: Ankur Arora --- arch/arm64/include/asm/rqspinlock.h | 85 ----------------------------- 1 file changed, 85 deletions(-) diff --git a/arch/arm64/include/asm/rqspinlock.h b/arch/arm64/include/asm/rqspinlock.h index 9ea0a74e5892..a385603436e9 100644 --- a/arch/arm64/include/asm/rqspinlock.h +++ b/arch/arm64/include/asm/rqspinlock.h @@ -3,91 +3,6 @@ #define _ASM_RQSPINLOCK_H #include - -/* - * Hardcode res_smp_cond_load_acquire implementations for arm64 to a custom - * version based on [0]. In rqspinlock code, our conditional expression involves - * checking the value _and_ additionally a timeout. However, on arm64, the - * WFE-based implementation may never spin again if no stores occur to the - * locked byte in the lock word. As such, we may be stuck forever if - * event-stream based unblocking is not available on the platform for WFE spin - * loops (arch_timer_evtstrm_available). - * - * Once support for smp_cond_load_acquire_timewait [0] lands, we can drop this - * copy-paste. - * - * While we rely on the implementation to amortize the cost of sampling - * cond_expr for us, it will not happen when event stream support is - * unavailable, time_expr check is amortized. This is not the common case, and - * it would be difficult to fit our logic in the time_expr_ns >= time_limit_ns - * comparison, hence just let it be. In case of event-stream, the loop is woken - * up at microsecond granularity. - * - * [0]: https://lore.kernel.org/lkml/20250203214911.898276-1-ankur.a.arora@oracle.com - */ - -#ifndef smp_cond_load_acquire_timewait - -#define smp_cond_time_check_count 200 - -#define __smp_cond_load_relaxed_spinwait(ptr, cond_expr, time_expr_ns, \ - time_limit_ns) ({ \ - typeof(ptr) __PTR = (ptr); \ - __unqual_scalar_typeof(*ptr) VAL; \ - unsigned int __count = 0; \ - for (;;) { \ - VAL = READ_ONCE(*__PTR); \ - if (cond_expr) \ - break; \ - cpu_relax(); \ - if (__count++ < smp_cond_time_check_count) \ - continue; \ - if ((time_expr_ns) >= (time_limit_ns)) \ - break; \ - __count = 0; \ - } \ - (typeof(*ptr))VAL; \ -}) - -#define __smp_cond_load_acquire_timewait(ptr, cond_expr, \ - time_expr_ns, time_limit_ns) \ -({ \ - typeof(ptr) __PTR = (ptr); \ - __unqual_scalar_typeof(*ptr) VAL; \ - for (;;) { \ - VAL = smp_load_acquire(__PTR); \ - if (cond_expr) \ - break; \ - __cmpwait_relaxed(__PTR, VAL); \ - if ((time_expr_ns) >= (time_limit_ns)) \ - break; \ - } \ - (typeof(*ptr))VAL; \ -}) - -#define smp_cond_load_acquire_timewait(ptr, cond_expr, \ - time_expr_ns, time_limit_ns) \ -({ \ - __unqual_scalar_typeof(*ptr) _val; \ - int __wfe = arch_timer_evtstrm_available(); \ - \ - if (likely(__wfe)) { \ - _val = __smp_cond_load_acquire_timewait(ptr, cond_expr, \ - time_expr_ns, \ - time_limit_ns); \ - } else { \ - _val = __smp_cond_load_relaxed_spinwait(ptr, cond_expr, \ - time_expr_ns, \ - time_limit_ns); \ - smp_acquire__after_ctrl_dep(); \ - } \ - (typeof(*ptr))_val; \ -}) - -#endif - -#define res_smp_cond_load_acquire(v, c) smp_cond_load_acquire_timewait(v, c, 0, 1) - #include #endif /* _ASM_RQSPINLOCK_H */ -- 2.43.7