From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Smith Subject: [PATCH 2/3] c/r: Add CR_COPY() macro (v2) Date: Wed, 25 Feb 2009 13:12:08 -0500 Message-ID: <1235585529-806-3-git-send-email-danms@us.ibm.com> References: <1235585529-806-1-git-send-email-danms@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1235585529-806-1-git-send-email-danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org List-Id: containers.vger.kernel.org As suggested by Dave, this provides us a way to make the copy-in and copy-out processes symmetric. I also added CR_COPY_BIT() to use with the s390 bitfields, since we can't memcpy() those. Changelog: Feb 25: . Changed WARN_ON() to BUILD_BUG_ON() Signed-off-by: Dan Smith --- 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..3add90e 100644 --- a/include/linux/checkpoint.h +++ b/include/linux/checkpoint.h @@ -149,4 +149,24 @@ static inline void process_deny_checkpointing(struct task_struct *task) {} #endif +#define CR_CPT 1 +#define CR_RST 2 + +#define CR_COPY(op, a, b) \ + do { \ + BUILD_BUG_ON(sizeof(a) != sizeof(b)); \ + if (op == CR_CPT) \ + memcpy(&a, &b, sizeof(a)); \ + else \ + memcpy(&b, &a, sizeof(a)); \ + } while (0); + +#define CR_COPY_BIT(op, a, b) \ + do { \ + if (op == CR_CPT) \ + a = b; \ + else \ + b = a; \ + } while (0); + #endif /* _CHECKPOINT_CKPT_H_ */ -- 1.6.1