[PATCH 1/2] mm/slab: use print_hex_dump

[PATCH 1/2] mm/slab: use print_hex_dump

[Sebastian Andrzej Siewior]

less code and the advantage of ascii dump.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/slab.c |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index d96e223..63ed525 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1810,15 +1810,15 @@ static void dump_line(char *data, int offset, int limit)
 	unsigned char error = 0;
 	int bad_count = 0;
 
-	printk(KERN_ERR "%03x:", offset);
+	printk(KERN_ERR "%03x: ", offset);
 	for (i = 0; i < limit; i++) {
 		if (data[offset + i] != POISON_FREE) {
 			error = data[offset + i];
 			bad_count++;
 		}
-		printk(" %02x", (unsigned char)data[offset + i]);
 	}
-	printk("\n");
+	print_hex_dump(KERN_CONT, "", 0, 16, 1,
+			&data[offset], limit, 1);
 
 	if (bad_count == 1) {
 		error ^= POISON_FREE;
@@ -2987,14 +2987,9 @@ bad:
 		printk(KERN_ERR "slab: Internal list corruption detected in "
 				"cache '%s'(%d), slabp %p(%d). Hexdump:\n",
 			cachep->name, cachep->num, slabp, slabp->inuse);
-		for (i = 0;
-		     i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t);
-		     i++) {
-			if (i % 16 == 0)
-				printk("\n%03x:", i);
-			printk(" %02x", ((unsigned char *)slabp)[i]);
-		}
-		printk("\n");
+		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
+			sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
+			1);
 		BUG();
 	}
 }
-- 
1.7.4.4

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[PATCH 2/2] mm/slub: use print_hex_dump

[Sebastian Andrzej Siewior]

less code and same functionality. The output would be:

| Object c7428000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
| Object c7428010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
| Object c7428020: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
| Object c7428030: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5              kkkkkkkkkkk.
| Redzone c742803c: bb bb bb bb                                      ....
| Padding c7428064: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a  ZZZZZZZZZZZZZZZZ
| Padding c7428074: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a              ZZZZZZZZZZZZ

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/slub.c |   44 +++++++++-----------------------------------
 1 files changed, 9 insertions(+), 35 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 35f351f..0e11a8a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -371,34 +371,8 @@ static int disable_higher_order_debug;
  */
 static void print_section(char *text, u8 *addr, unsigned int length)
 {
-	int i, offset;
-	int newline = 1;
-	char ascii[17];
-
-	ascii[16] = 0;
-
-	for (i = 0; i < length; i++) {
-		if (newline) {
-			printk(KERN_ERR "%8s 0x%p: ", text, addr + i);
-			newline = 0;
-		}
-		printk(KERN_CONT " %02x", addr[i]);
-		offset = i % 16;
-		ascii[offset] = isgraph(addr[i]) ? addr[i] : '.';
-		if (offset == 15) {
-			printk(KERN_CONT " %s\n", ascii);
-			newline = 1;
-		}
-	}
-	if (!newline) {
-		i %= 16;
-		while (i < 16) {
-			printk(KERN_CONT "   ");
-			ascii[i] = ' ';
-			i++;
-		}
-		printk(KERN_CONT " %s\n", ascii);
-	}
+	print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr,
+			length, 1);
 }
 
 static struct track *get_track(struct kmem_cache *s, void *object,
@@ -501,12 +475,12 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
 			p, p - addr, get_freepointer(s, p));
 
 	if (p > addr + 16)
-		print_section("Bytes b4", p - 16, 16);
-
-	print_section("Object", p, min_t(unsigned long, s->objsize, PAGE_SIZE));
+		print_section("Bytes b4 ", p - 16, 16);
 
+	print_section("Object ", p, min_t(unsigned long, s->objsize,
+				PAGE_SIZE));
 	if (s->flags & SLAB_RED_ZONE)
-		print_section("Redzone", p + s->objsize,
+		print_section("Redzone ", p + s->objsize,
 			s->inuse - s->objsize);
 
 	if (s->offset)
@@ -519,7 +493,7 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
 
 	if (off != s->size)
 		/* Beginning of the filler is the free pointer */
-		print_section("Padding", p + off, s->size - off);
+		print_section("Padding ", p + off, s->size - off);
 
 	dump_stack();
 }
@@ -682,7 +656,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
 		end--;
 
 	slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
-	print_section("Padding", end - remainder, remainder);
+	print_section("Padding ", end - remainder, remainder);
 
 	restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end);
 	return 0;
@@ -830,7 +804,7 @@ static void trace(struct kmem_cache *s, struct page *page, void *object,
 			page->freelist);
 
 		if (!alloc)
-			print_section("Object", (void *)object, s->objsize);
+			print_section("Object ", (void *)object, s->objsize);
 
 		dump_stack();
 	}
-- 
1.7.4.4

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Re: [PATCH 1/2] mm/slab: use print_hex_dump

[Christoph Lameter]

On Fri, 29 Jul 2011, Sebastian Andrzej Siewior wrote:

> less code and the advantage of ascii dump.

Would you please include an example of output before and after the change?

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[PATCH v2] mm/slab: use print_hex_dump

[Sebastian Andrzej Siewior]

less code and the advantage of ascii dump.

before:
| Slab corruption: names_cache start=c5788000, len=4096
| 000: 6b 6b 01 00 00 00 56 00 00 00 24 00 00 00 2a 00
| 010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
| 020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ff
| 030: ff ff ff ff e2 b4 17 18 c7 e4 08 06 00 01 08 00
| 040: 06 04 00 01 e2 b4 17 18 c7 e4 0a 00 00 01 00 00
| 050: 00 00 00 00 0a 00 00 02 6b 6b 6b 6b 6b 6b 6b 6b

after:
| Slab corruption: size-4096 start=c38a9000, len=4096
| 000: 6b 6b 01 00 00 00 56 00 00 00 24 00 00 00 2a 00  kk....V...$...*.
| 010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
| 020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ff  ................
| 030: ff ff ff ff d2 56 5f aa db 9c 08 06 00 01 08 00  .....V_.........
| 040: 06 04 00 01 d2 56 5f aa db 9c 0a 00 00 01 00 00  .....V_.........
| 050: 00 00 00 00 0a 00 00 02 6b 6b 6b 6b 6b 6b 6b 6b  ........kkkkkkkk

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/slab.c |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index d96e223..63ed525 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1810,15 +1810,15 @@ static void dump_line(char *data, int offset, int limit)
 	unsigned char error = 0;
 	int bad_count = 0;
 
-	printk(KERN_ERR "%03x:", offset);
+	printk(KERN_ERR "%03x: ", offset);
 	for (i = 0; i < limit; i++) {
 		if (data[offset + i] != POISON_FREE) {
 			error = data[offset + i];
 			bad_count++;
 		}
-		printk(" %02x", (unsigned char)data[offset + i]);
 	}
-	printk("\n");
+	print_hex_dump(KERN_CONT, "", 0, 16, 1,
+			&data[offset], limit, 1);
 
 	if (bad_count == 1) {
 		error ^= POISON_FREE;
@@ -2987,14 +2987,9 @@ bad:
 		printk(KERN_ERR "slab: Internal list corruption detected in "
 				"cache '%s'(%d), slabp %p(%d). Hexdump:\n",
 			cachep->name, cachep->num, slabp, slabp->inuse);
-		for (i = 0;
-		     i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t);
-		     i++) {
-			if (i % 16 == 0)
-				printk("\n%03x:", i);
-			printk(" %02x", ((unsigned char *)slabp)[i]);
-		}
-		printk("\n");
+		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
+			sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
+			1);
 		BUG();
 	}
 }
-- 
1.7.4.4

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Re: [PATCH v2] mm/slab: use print_hex_dump

[Christoph Lameter]

On Fri, 29 Jul 2011, Sebastian Andrzej Siewior wrote:

> less code and the advantage of ascii dump.

Cool.

Acked-by: Christoph Lameter <cl@linux.com>

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Re: [PATCH 2/2] mm/slub: use print_hex_dump

[Christoph Lameter]

Acked-by: Christoph Lameter <cl@linux.com>

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Re: [PATCH v2] mm/slab: use print_hex_dump

[Pekka Enberg]

On Fri, 29 Jul 2011, Sebastian Andrzej Siewior wrote:
>> less code and the advantage of ascii dump.

On Fri, 29 Jul 2011, Christoph Lameter wrote:
> Cool.
>
> Acked-by: Christoph Lameter <cl@linux.com>

I applied both patches and will queue them for linux-next once -rc1 is 
out. Thanks!

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