linux-kernel - [RFC 04/31] mars: add new module brick

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Message-Id: <af8f8082d7e4333dbd0c8d8f7faa76988a388d14.1451558672.git.tst@schoebel-theuer.de>
Date:	Thu, 31 Dec 2015 12:35:59 +0100
From:	Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To:	linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 04/31] mars: add new module brick_checking

Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
 include/linux/brick/brick_checking.h | 104 +++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 include/linux/brick/brick_checking.h

diff --git a/include/linux/brick/brick_checking.h b/include/linux/brick/brick_checking.h
new file mode 100644
index 0000000..a02f1bf
--- /dev/null
+++ b/include/linux/brick/brick_checking.h
@@ -0,0 +1,104 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef BRICK_CHECKING_H
+#define BRICK_CHECKING_H
+
+/***********************************************************************/
+
+/*  checking */
+
+#if defined(CONFIG_MARS_DEBUG) || defined(CONFIG_MARS_CHECKS)
+#define BRICK_CHECKING			true
+#else
+#define BRICK_CHECKING			false
+#endif
+
+#define _CHECK_ATOMIC(atom, OP, minval)					\
+do {									\
+	if (BRICK_CHECKING) {						\
+		int __test = atomic_read(atom);				\
+		if (unlikely(__test OP(minval))) {			\
+			atomic_set(atom, minval);			\
+			BRICK_ERR("%d: atomic " #atom " " #OP " " #minval " (%d)\n", __LINE__, __test);\
+		}							\
+	}								\
+} while (0)
+
+#define CHECK_ATOMIC(atom, minval)					\
+	_CHECK_ATOMIC(atom, <, minval)
+
+#define CHECK_HEAD_EMPTY(head)						\
+do {									\
+	if (BRICK_CHECKING && unlikely(!list_empty(head) && (head)->next)) {\
+		list_del_init(head);					\
+		BRICK_ERR("%d: list_head " #head " (%p) not empty\n", __LINE__, head);\
+	}								\
+} while (0)
+
+#ifdef CONFIG_MARS_DEBUG_MEM
+#define CHECK_PTR_DEAD(ptr, label)					\
+do {									\
+	if (BRICK_CHECKING && unlikely((ptr) == (void *)0x5a5a5a5a5a5a5a5a)) {\
+		BRICK_FAT("%d: pointer '" #ptr "' is DEAD\n", __LINE__);\
+		goto label;						\
+	}								\
+} while (0)
+#else
+#define CHECK_PTR_DEAD(ptr, label) /*empty*/
+#endif
+
+#define CHECK_PTR_NULL(ptr, label)					\
+do {									\
+	CHECK_PTR_DEAD(ptr, label);					\
+	if (BRICK_CHECKING && unlikely(!(ptr))) {			\
+		BRICK_FAT("%d: pointer '" #ptr "' is NULL\n", __LINE__);\
+		goto label;						\
+	}								\
+} while (0)
+
+#ifdef CONFIG_MARS_DEBUG
+#define CHECK_PTR(ptr, label)						\
+do {									\
+	CHECK_PTR_NULL(ptr, label);					\
+	if (BRICK_CHECKING && unlikely(!virt_addr_valid(ptr))) {	\
+		BRICK_FAT("%d: pointer '" #ptr "' (%p) is no valid virtual KERNEL address\n", __LINE__, ptr);\
+		goto label;						\
+	}								\
+} while (0)
+#else
+#define CHECK_PTR(ptr, label) CHECK_PTR_NULL(ptr, label)
+#endif
+
+#define CHECK_ASPECT(a_ptr, o_ptr, label)				\
+do {									\
+	if (BRICK_CHECKING && unlikely((a_ptr)->object != o_ptr)) {	\
+		BRICK_FAT("%d: aspect pointer '" #a_ptr "' (%p) belongs to object %p, not to " #o_ptr " (%p)\n",\
+			__LINE__, a_ptr, (a_ptr)->object, o_ptr);	\
+		goto label;						\
+	}								\
+} while (0)
+
+#define _CHECK(ptr, label)						\
+do {									\
+	if (BRICK_CHECKING && unlikely(!(ptr))) {			\
+		BRICK_FAT("%d: condition '" #ptr "' is VIOLATED\n", __LINE__);\
+		goto label;						\
+	}								\
+} while (0)
+
+#endif
-- 
2.6.4

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