linux-kernel - [PATCH 2/3] c/r: Add CR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue,  3 Mar 2009 10:56:03 -0500
From:	Dan Smith <danms@...ibm.com>
To:	containers@...ts.osdl.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] c/r: Add CR_COPY() macro (v3)

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 <danms@...ibm.com>

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@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/