Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758110AbZCCP5A (ORCPT ); Tue, 3 Mar 2009 10:57:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754628AbZCCP4t (ORCPT ); Tue, 3 Mar 2009 10:56:49 -0500 Received: from igw2.watson.ibm.com ([129.34.20.6]:50168 "EHLO igw2.watson.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754132AbZCCP4t (ORCPT ); Tue, 3 Mar 2009 10:56:49 -0500 From: Dan Smith To: containers@lists.osdl.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 2/3] c/r: Add CR_COPY() macro (v3) Date: Tue, 3 Mar 2009 10:56:03 -0500 Message-Id: <1236095764-19325-3-git-send-email-danms@us.ibm.com> X-Mailer: git-send-email 1.6.1 In-Reply-To: <1236095764-19325-1-git-send-email-danms@us.ibm.com> References: <1236095764-19325-1-git-send-email-danms@us.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2006 Lines: 61 As suggested by Dave[1], this provides us a way to make the copy-in and copy-out processes symmetric. CR_COPY_ARRAY() provides us a way to do the same thing but for arrays. It's not critical, but it helps us unify the checkpoint and restart paths for some things. Changelog: Feb 27: . Changed CR_COPY() to use assignment, eliminating the need for the CR_COPY_BIT() macro . Add CR_COPY_ARRAY() macro to help copying register arrays, etc . Move the macro definitions inside the CR #ifdef Feb 25: . Changed WARN_ON() to BUILD_BUG_ON() Signed-off-by: Dan Smith 1: https://lists.linux-foundation.org/pipermail/containers/2009-February/015821.html (all the way at the bottom) --- include/linux/checkpoint.h | 20 ++++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletions(-) diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h index 217cf6e..735668f 100644 --- a/include/linux/checkpoint.h +++ b/include/linux/checkpoint.h @@ -142,6 +142,26 @@ static inline void __task_deny_checkpointing(struct task_struct *task, #define task_deny_checkpointing(p) \ __task_deny_checkpointing(p, __FILE__, __LINE__) +#define CR_CPT 1 +#define CR_RST 2 + +#define CR_COPY(op, a, b) \ + do { \ + if (op == CR_CPT) \ + a = b; \ + else \ + b = a; \ + } while (0); + +#define CR_COPY_ARRAY(op, a, b, count) \ + do { \ + BUILD_BUG_ON(sizeof(*a) != sizeof(*b)); \ + if (op == CR_CPT) \ + memcpy(a, b, count * sizeof(*a)); \ + else \ + memcpy(b, a, count * sizeof(*a)); \ + } while (0); + #else static inline void task_deny_checkpointing(struct task_struct *task) {} -- 1.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/