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From: Dave Jones <davej@redhat.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Arjan van de Ven <arjan@infradead.org>,
	Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] Make
Date: Mon, 19 May 2008 23:24:48 -0400	[thread overview]
Message-ID: <20080520032448.GA19348@redhat.com> (raw)
In-Reply-To: <20080502184922.GM14976@parisc-linux.org>

Arjan noted that the list_head debugging is BUG'ing when it detects
corruption.  By causing the box to panic immediately, we're possibly
losing some bug reports.   Changing this to a WARN_ON should mean
we at the least start seeing reports collected at kerneloops.org

[ I chose to BUG() when I first added that code, because I was
  chasing a bug which caused a lockup anyway, so it made little difference
  to me. ]

Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 4350ba9..09f28bf 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -24,13 +24,13 @@ void __list_add(struct list_head *new,
 		printk(KERN_ERR "list_add corruption. next->prev should be "
 			"prev (%p), but was %p. (next=%p).\n",
 			prev, next->prev, next);
-		BUG();
+		WARN_ON(1);
 	}
 	if (unlikely(prev->next != next)) {
 		printk(KERN_ERR "list_add corruption. prev->next should be "
 			"next (%p), but was %p. (prev=%p).\n",
 			next, prev->next, prev);
-		BUG();
+		WARN_ON(1);
 	}
 	next->prev = new;
 	new->next = next;
@@ -64,12 +64,12 @@ void list_del(struct list_head *entry)
 	if (unlikely(entry->prev->next != entry)) {
 		printk(KERN_ERR "list_del corruption. prev->next should be %p, "
 				"but was %p\n", entry, entry->prev->next);
-		BUG();
+		WARN_ON(1);
 	}
 	if (unlikely(entry->next->prev != entry)) {
 		printk(KERN_ERR "list_del corruption. next->prev should be %p, "
 				"but was %p\n", entry, entry->next->prev);
-		BUG();
+		WARN_ON(1);
 	}
 	__list_del(entry->prev, entry->next);
 	entry->next = LIST_POISON1;

-- 
http://www.codemonkey.org.uk

  parent reply	other threads:[~2008-05-20  3:31 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-02 18:27 [PATCH] Extend list debugging to cover hlists Matthew Wilcox
2008-05-01 20:32 ` Arjan van de Ven
2008-05-02 18:49   ` Matthew Wilcox
2008-05-02 19:05     ` Dave Jones
2008-05-20  3:24     ` Dave Jones [this message]
2008-05-20 14:14       ` [PATCH] Make Arjan van de Ven
2008-05-20 14:27         ` Dave Jones
2008-05-20 14:54           ` Linus Torvalds
2008-05-20 15:20             ` Dave Jones
2008-05-20 16:15             ` Arjan van de Ven
2008-05-20 15:00           ` Alexey Dobriyan
2008-05-20 15:12             ` Linus Torvalds
2008-05-20 15:22               ` Dave Jones
2008-05-20 21:52                 ` [PATCH] Make (LIST_DEBUG WARN not BUG) Alexey Dobriyan
2008-05-02 23:14 ` [PATCH] Extend list debugging to cover hlists Andrew Morton
2008-05-02 23:17   ` Matthew Wilcox
2008-05-02 23:39     ` Andrew Morton

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