[PATCH] add poison.h and patch primary users
Randy Dunlap [Tue, 27 Jun 2006 09:53:52 +0000 (02:53 -0700)]
Localize poison values into one header file for better documentation and
easier/quicker debugging and so that the same values won't be used for
multiple purposes.

Use these constants in core arch., mm, driver, and fs code.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Matt Mackall <mpm@selenic.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/mm/init.c
arch/powerpc/mm/init_64.c
arch/sparc64/mm/init.c
arch/x86_64/mm/init.c
drivers/base/dmapool.c
fs/jbd/journal.c
include/linux/list.h
include/linux/poison.h [new file with mode: 0644]
mm/slab.c

index 4685925..f84b16e 100644 (file)
@@ -23,6 +23,7 @@
 #include <linux/init.h>
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
+#include <linux/poison.h>
 #include <linux/bootmem.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
@@ -753,7 +754,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
        for (addr = begin; addr < end; addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
-               memset((void *)addr, 0xcc, PAGE_SIZE);
+               memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
                free_page(addr);
                totalram_pages++;
        }
index 9e30f96..d454caa 100644 (file)
@@ -41,6 +41,7 @@
 #include <linux/idr.h>
 #include <linux/nodemask.h>
 #include <linux/module.h>
+#include <linux/poison.h>
 
 #include <asm/pgalloc.h>
 #include <asm/page.h>
@@ -90,7 +91,7 @@ void free_initmem(void)
 
        addr = (unsigned long)__init_begin;
        for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
-               memset((void *)addr, 0xcc, PAGE_SIZE);
+               memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
                free_page(addr);
index 5c2bcf3..cb75a27 100644 (file)
@@ -18,6 +18,7 @@
 #include <linux/initrd.h>
 #include <linux/swap.h>
 #include <linux/pagemap.h>
+#include <linux/poison.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
 #include <linux/kprobes.h>
@@ -1520,7 +1521,7 @@ void free_initmem(void)
                page = (addr +
                        ((unsigned long) __va(kern_base)) -
                        ((unsigned long) KERNBASE));
-               memset((void *)addr, 0xcc, PAGE_SIZE);
+               memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
                p = virt_to_page(page);
 
                ClearPageReserved(p);
index 51fbf3e..95bd232 100644 (file)
@@ -23,6 +23,7 @@
 #include <linux/bootmem.h>
 #include <linux/proc_fs.h>
 #include <linux/pci.h>
+#include <linux/poison.h>
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/memory_hotplug.h>
@@ -660,7 +661,8 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
        for (addr = begin; addr < end; addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
-               memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); 
+               memset((void *)(addr & ~(PAGE_SIZE-1)),
+                       POISON_FREE_INITMEM, PAGE_SIZE);
                free_page(addr);
                totalram_pages++;
        }
@@ -668,7 +670,8 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 
 void free_initmem(void)
 {
-       memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin);
+       memset(__initdata_begin, POISON_FREE_INITDATA,
+               __initdata_end - __initdata_begin);
        free_init_pages("unused kernel memory",
                        (unsigned long)(&__init_begin),
                        (unsigned long)(&__init_end));
index e2f64f9..33c5cce 100644 (file)
@@ -7,6 +7,7 @@
 #include <linux/dmapool.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/poison.h>
 
 /*
  * Pool allocator ... wraps the dma_alloc_coherent page allocator, so
@@ -35,8 +36,6 @@ struct dma_page {     /* cacheable header for 'allocation' bytes */
 };
 
 #define        POOL_TIMEOUT_JIFFIES    ((100 /* msec */ * HZ) / 1000)
-#define        POOL_POISON_FREED       0xa7    /* !inuse */
-#define        POOL_POISON_ALLOCATED   0xa9    /* !initted */
 
 static DECLARE_MUTEX (pools_lock);
 
index 7f96b5c..8c9b28d 100644 (file)
@@ -34,6 +34,7 @@
 #include <linux/suspend.h>
 #include <linux/pagemap.h>
 #include <linux/kthread.h>
+#include <linux/poison.h>
 #include <linux/proc_fs.h>
 
 #include <asm/uaccess.h>
@@ -1675,7 +1676,7 @@ static void journal_free_journal_head(struct journal_head *jh)
 {
 #ifdef CONFIG_JBD_DEBUG
        atomic_dec(&nr_journal_heads);
-       memset(jh, 0x5b, sizeof(*jh));
+       memset(jh, JBD_POISON_FREE, sizeof(*jh));
 #endif
        kmem_cache_free(journal_head_cache, jh);
 }
index 37ca31b..6b74adf 100644 (file)
@@ -4,18 +4,11 @@
 #ifdef __KERNEL__
 
 #include <linux/stddef.h>
+#include <linux/poison.h>
 #include <linux/prefetch.h>
 #include <asm/system.h>
 
 /*
- * These are non-NULL pointers that will result in page faults
- * under normal circumstances, used to verify that nobody uses
- * non-initialized list entries.
- */
-#define LIST_POISON1  ((void *) 0x00100100)
-#define LIST_POISON2  ((void *) 0x00200200)
-
-/*
  * Simple doubly linked list implementation.
  *
  * Some of the internal functions ("__xxx") are useful when
diff --git a/include/linux/poison.h b/include/linux/poison.h
new file mode 100644 (file)
index 0000000..d536de7
--- /dev/null
@@ -0,0 +1,45 @@
+#ifndef _LINUX_POISON_H
+#define _LINUX_POISON_H
+
+/********** include/linux/list.h **********/
+/*
+ * These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1  ((void *) 0x00100100)
+#define LIST_POISON2  ((void *) 0x00200200)
+
+/********** mm/slab.c **********/
+/*
+ * Magic nums for obj red zoning.
+ * Placed in the first word before and the first word after an obj.
+ */
+#define        RED_INACTIVE    0x5A2CF071UL    /* when obj is inactive */
+#define        RED_ACTIVE      0x170FC2A5UL    /* when obj is active */
+
+/* ...and for poisoning */
+#define        POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
+#define POISON_FREE    0x6b    /* for use-after-free poisoning */
+#define        POISON_END      0xa5    /* end-byte of poisoning */
+
+/********** arch/$ARCH/mm/init.c **********/
+#define POISON_FREE_INITMEM    0xcc
+
+/********** arch/x86_64/mm/init.c **********/
+#define        POISON_FREE_INITDATA    0xba
+
+/********** arch/ia64/hp/common/sba_iommu.c **********/
+/*
+ * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
+ * value of "SBAIOMMU POISON\0" for spill-over poisoning.
+ */
+
+/********** fs/jbd/journal.c **********/
+#define JBD_POISON_FREE        0x5b
+
+/********** drivers/base/dmapool.c **********/
+#define        POOL_POISON_FREED       0xa7    /* !inuse */
+#define        POOL_POISON_ALLOCATED   0xa9    /* !initted */
+
+#endif
index 98ac20b..47982c2 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -89,6 +89,7 @@
 #include       <linux/config.h>
 #include       <linux/slab.h>
 #include       <linux/mm.h>
+#include       <linux/poison.h>
 #include       <linux/swap.h>
 #include       <linux/cache.h>
 #include       <linux/interrupt.h>
@@ -492,17 +493,6 @@ struct kmem_cache {
 #endif
 
 #if DEBUG
-/*
- * Magic nums for obj red zoning.
- * Placed in the first word before and the first word after an obj.
- */
-#define        RED_INACTIVE    0x5A2CF071UL    /* when obj is inactive */
-#define        RED_ACTIVE      0x170FC2A5UL    /* when obj is active */
-
-/* ...and for poisoning */
-#define        POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
-#define POISON_FREE    0x6b    /* for use-after-free poisoning */
-#define        POISON_END      0xa5    /* end-byte of poisoning */
 
 /*
  * memory layout of objects: