From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uros Bizjak Subject: [PATCH 06/10] locking/powerpc: Wire up local_try_cmpxchg Date: Sun, 5 Mar 2023 21:56:24 +0100 Message-ID: <20230305205628.27385-7-ubizjak@gmail.com> References: <20230305205628.27385-1-ubizjak@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678049822; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=25TOpB6uAuDptlCHYXnw8K0sBZK8F7O48wtvqw46Fco=; b=cNd8YqsFIPxe+JP9zRF39U9LVtgmwfXjcFbHH84MFejyyz+WXmA51xlzYADH9AC01W lEszc02CudZI42k7pYdy16Vf4WI6WjE1DZx56EjyaZpyY7FvA1+pVY1RSyjgr+NlrGpr yFwug2e2C37vzQDmuS5CJX+8dF3kzqMWXP62SO1BV9+XSfgAJAzZ1JEkQPQMUXgK2qm4 0hyBNzM1O3Kv/jPXAGYRtlnLBj1s1v9YygYUST1D+zx9Ey2ipnETSfTUq5UPh138ocjy r6cJKI1TIKvZxYHHrTVVuJQaSsFt81JXXkjl01KWi2F25uQE45bvL71Q902loyxf7ehM /C8Q== In-Reply-To: <20230305205628.27385-1-ubizjak@gmail.com> List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: Uros Bizjak , Michael Ellerman , Nicholas Piggin , Christophe Leroy Implement target specific support for local_try_cmpxchg. Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Signed-off-by: Uros Bizjak Signed-off-by: Uros Bizjak --- arch/powerpc/include/asm/local.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/powerpc/include/asm/local.h b/arch/powerpc/include/asm/local.h index bc4bd19b7fc2..45492fb5bf22 100644 --- a/arch/powerpc/include/asm/local.h +++ b/arch/powerpc/include/asm/local.h @@ -90,6 +90,17 @@ static __inline__ long local_cmpxchg(local_t *l, long o, long n) return t; } +static __inline__ bool local_try_cmpxchg(local_t *l, long *po, long n) +{ + long o = *po, r; + + r = local_cmpxchg(l, o, n); + if (unlikely(r != o)) + *po = r; + + return likely(r == o); +} + static __inline__ long local_xchg(local_t *l, long n) { long t; -- 2.39.2