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 <danms@xxxxxxxxxx>
---
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
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