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a=1CNFftbPRP8L7MoqJWF3:22 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260408_052649_119885_C6E769AE X-CRM114-Status: GOOD ( 14.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the acquire variant of smp_cond_load_relaxed_timeout(). 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 e5a6a1c04649..68d9e7108f4a 100644 --- a/include/asm-generic/barrier.h +++ b/include/asm-generic/barrier.h @@ -342,6 +342,32 @@ do { \ }) #endif +/** + * smp_cond_load_acquire_timeout() - (Spin) wait for cond with ACQUIRE ordering + * until a timeout expires. + * @ptr: pointer to the variable to wait on. + * @cond_expr: 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 with + * 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 = 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 -- 2.31.1