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This reuses the relaxed variant, with additional LOAD->LOAD ordering. Cc: Arnd Bergmann Cc: Will Deacon Cc: Catalin Marinas Cc: Peter Zijlstra Cc: linux-arch@vger.kernel.org Reviewed-by: Catalin Marinas Reviewed-by: Haris Okanovic Tested-by: Haris Okanovic Signed-off-by: Ankur Arora --- include/asm-generic/barrier.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h index e25592f9fcbf..d05d34bece0d 100644 --- a/include/asm-generic/barrier.h +++ b/include/asm-generic/barrier.h @@ -331,6 +331,32 @@ __done: \ }) #endif =20 +/** + * smp_cond_load_acquire_timeout() - (Spin) wait for cond with ACQUIRE ord= ering + * until a timeout expires. + * @ptr: pointer to the variable to wait on + * @cond: boolean expression to wait for + * @time_expr_ns: monotonic expression that evaluates to time in ns or, + * on failure, returns a negative value. + * @timeout_ns: timeout value in ns + * (Both of the above are assumed to be compatible with s64.) + * + * Equivalent to using smp_cond_load_acquire() on the condition variable w= ith + * a timeout. + */ +#ifndef smp_cond_load_acquire_timeout +#define smp_cond_load_acquire_timeout(ptr, cond_expr, \ + time_expr_ns, timeout_ns) \ +({ \ + __unqual_scalar_typeof(*ptr) _val; \ + _val =3D smp_cond_load_relaxed_timeout(ptr, cond_expr, \ + time_expr_ns, \ + timeout_ns); \ + smp_acquire__after_ctrl_dep(); \ + (typeof(*ptr))_val; \ +}) +#endif + /* * pmem_wmb() ensures that all stores for which the modification * are written to persistent storage by preceding instructions have --=20 2.31.1