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Subject[RFC v17][PATCH 54/60] c/r: add CKPT_COPY() macro
Date
From: Dan Smith <danms@us.ibm.com>

As suggested by Dave[1], this provides us a way to make the copy-in and
copy-out processes symmetric. CKPT_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:
Mar 04:
. Removed semicolons
. Added build-time check for __must_be_array in CKPT_COPY_ARRAY
Feb 27:
. Changed CKPT_COPY() to use assignment, eliminating the need
for the CKPT_COPY_BIT() macro
. Add CKPT_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 <danms@us.ibm.com>
Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>

1: https://lists.linux-foundation.org/pipermail/containers/2009-February/015821.html (all the way at the bottom)
---
include/linux/checkpoint.h | 29 +++++++++++++++++++++++++++++
1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
index aeae2fa..2ee1bc2 100644
--- a/include/linux/checkpoint.h
+++ b/include/linux/checkpoint.h
@@ -211,6 +211,34 @@ extern int restore_memory_contents(struct ckpt_ctx *ctx, struct inode *inode);
VM_MAPPED_COPY | VM_INSERTPAGE | VM_MIXEDMAP | VM_SAO)


+/* useful macros to copy fields and buffers to/from ckpt_hdr_xxx structures */
+#define CKPT_CPT 1
+#define CKPT_RST 2
+
+#define CKPT_COPY(op, SAVE, LIVE) \
+ do { \
+ if (op == CKPT_CPT) \
+ SAVE = LIVE; \
+ else \
+ LIVE = SAVE; \
+ } while (0)
+
+/*
+ * Copy @count items from @LIVE to @SAVE if op is CKPT_CPT (otherwise,
+ * copy in the reverse direction)
+ */
+#define CKPT_COPY_ARRAY(op, SAVE, LIVE, count) \
+ do { \
+ (void)__must_be_array(SAVE); \
+ (void)__must_be_array(LIVE); \
+ BUILD_BUG_ON(sizeof(*SAVE) != sizeof(*LIVE)); \
+ if (op == CKPT_CPT) \
+ memcpy(SAVE, LIVE, count * sizeof(*SAVE)); \
+ else \
+ memcpy(LIVE, SAVE, count * sizeof(*SAVE)); \
+ } while (0)
+
+
/* debugging flags */
#define CKPT_DBASE 0x1 /* anything */
#define CKPT_DSYS 0x2 /* generic (system) */
@@ -243,6 +271,7 @@ extern unsigned long ckpt_debug_level;
* CKPT_DBASE is the base flags, doesn't change
* CKPT_DFLAG is to be redfined in each source file
*/
+
#define ckpt_debug(fmt, args...) \
_ckpt_debug(CKPT_DBASE | CKPT_DFLAG, fmt, ## args)

--
1.6.0.4


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