From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935488Ab3E3QTV (ORCPT ); Thu, 30 May 2013 12:19:21 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:1918 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934191Ab3E3QS7 (ORCPT ); Thu, 30 May 2013 12:18:59 -0400 X-IronPort-AV: E=Sophos;i="4.87,772,1363132800"; d="scan'208";a="26943891" From: Stefano Stabellini To: CC: , , , , , , , Stefano Stabellini Subject: [PATCH RFC 4/6] arm64/xen: introduce asm/hypervisor.h and sys_bitops.h Date: Thu, 30 May 2013 17:18:31 +0100 Message-ID: <1369930713-6063-4-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Stefano Stabellini --- arch/arm64/include/asm/hypervisor.h | 6 ++++++ arch/arm64/include/asm/sync_bitops.h | 26 ++++++++++++++++++++++++++ 2 files changed, 32 insertions(+), 0 deletions(-) create mode 100644 arch/arm64/include/asm/hypervisor.h create mode 100644 arch/arm64/include/asm/sync_bitops.h diff --git a/arch/arm64/include/asm/hypervisor.h b/arch/arm64/include/asm/hypervisor.h new file mode 100644 index 0000000..b90d9e5 --- /dev/null +++ b/arch/arm64/include/asm/hypervisor.h @@ -0,0 +1,6 @@ +#ifndef _ASM_ARM_HYPERVISOR_H +#define _ASM_ARM_HYPERVISOR_H + +#include + +#endif diff --git a/arch/arm64/include/asm/sync_bitops.h b/arch/arm64/include/asm/sync_bitops.h new file mode 100644 index 0000000..8da0bf4 --- /dev/null +++ b/arch/arm64/include/asm/sync_bitops.h @@ -0,0 +1,26 @@ +#ifndef __ASM_SYNC_BITOPS_H__ +#define __ASM_SYNC_BITOPS_H__ + +#include +#include + +/* sync_bitops functions are equivalent to the SMP implementation of the + * original functions, independently from CONFIG_SMP being defined. + * + * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But + * under Xen you might be communicating with a completely external entity + * who might be on another CPU (e.g. two uniprocessor guests communicating + * via event channels and grant tables). So we need a variant of the bit + * ops which are SMP safe even on a UP kernel. + */ + +#define sync_set_bit(nr, p) set_bit(nr, p) +#define sync_clear_bit(nr, p) clear_bit(nr, p) +#define sync_change_bit(nr, p) change_bit(nr, p) +#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) +#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) +#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) +#define sync_test_bit(nr, addr) test_bit(nr, addr) +#define sync_cmpxchg cmpxchg + +#endif -- 1.7.2.5