linux-kernel - Re: [PATCH] Make

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Message-ID: <20080520142727.GC4843@redhat.com>
Date:	Tue, 20 May 2008 10:27:27 -0400
From:	Dave Jones <davej@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Matthew Wilcox <matthew@....cx>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make

On Tue, May 20, 2008 at 07:14:58AM -0700, Arjan van de Ven wrote:
 > On Mon, 19 May 2008 23:24:48 -0400
 > Dave Jones <davej@...hat.com> wrote:
 > 
 > >  		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);
 > >  	}
 > 
 > 
 > now that -mm has a WARN(condition, printk arguments), could we make
 > this use it? The advantage (apart from smaller C code) is that it puts
 > the printk inside the ---[ cut here ]--- which makes it more likely that
 > reporters (and kerneloops.org) get the actual text....

Like this ?  (I don't have a -mm handy, so guessed based on mm-commits mail,
  patch uncompiled, but should dtrt if I understood your diff correctly)

	Dave

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 4350ba9..d8dee53 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -21,16 +21,14 @@ void __list_add(struct list_head *new,
 			      struct list_head *next)
 {
 	if (unlikely(next->prev != prev)) {
-		printk(KERN_ERR "list_add corruption. next->prev should be "
+		WARN(1, "list_add corruption. next->prev should be "
 			"prev (%p), but was %p. (next=%p).\n",
 			prev, next->prev, next);
-		BUG();
 	}
 	if (unlikely(prev->next != next)) {
-		printk(KERN_ERR "list_add corruption. prev->next should be "
+		WARN(1, "list_add corruption. prev->next should be "
 			"next (%p), but was %p. (prev=%p).\n",
 			next, prev->next, prev);
-		BUG();
 	}
 	next->prev = new;
 	new->next = next;
@@ -62,14 +60,12 @@ EXPORT_SYMBOL(list_add);
 void list_del(struct list_head *entry)
 {
 	if (unlikely(entry->prev->next != entry)) {
-		printk(KERN_ERR "list_del corruption. prev->next should be %p, "
+		WARN(1, "list_del corruption. prev->next should be %p, "
 				"but was %p\n", entry, entry->prev->next);
-		BUG();
 	}
 	if (unlikely(entry->next->prev != entry)) {
-		printk(KERN_ERR "list_del corruption. next->prev should be %p, "
+		WARN(1, "list_del corruption. next->prev should be %p, "
 				"but was %p\n", entry, entry->next->prev);
-		BUG();
 	}
 	__list_del(entry->prev, entry->next);
 	entry->next = LIST_POISON1;
-- 
http://www.codemonkey.org.uk
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