[RFC v17][PATCH 54/60] c/r: add CKPT_COPY() macro
From: Oren Laadan <hidden>
Date: 2009-07-22 10:12:01
Also in:
linux-mm, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
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-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Oren Laadan <redacted>
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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