linux-kernel - Re: linux-next: Tree for July 29

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Date:	Thu, 7 Aug 2008 11:08:44 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Greg KH <gregkh@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>, bwalle@...e.de,
	greg@...ah.com, hugh@...itas.com, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, haveblue@...ibm.com
Subject: Re: linux-next: Tree for July 29

HI Greg,

On Wed, 30 Jul 2008 16:44:19 -0700 Greg KH <gregkh@...e.de> wrote:
>
> On Thu, Jul 31, 2008 at 09:41:05AM +1000, Stephen Rothwell wrote:
> > Hi Andrew,
> > 
> > On Wed, 30 Jul 2008 13:04:19 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
> > >
> > > The offending patch has just got itself turfed from linux-next so my
> > > fix now has nothing to fix.
> > > 
> > > We'll see what happens!
> > 
> > I will put Dave's patch back with yours on top of it (hoping that Greg
> > will take your patch).
> 
> Greg will, it's in my queue.

This is still not in your patch series ...  summary email with patch
repeated below.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

Date: Wed, 30 Jul 2008 02:19:47 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Bernhard Walle <bwalle@...e.de>
Cc: Greg KH <greg@...ah.com>, Hugh Dickins <hugh@...itas.com>,
        Greg KH <gregkh@...e.de>,
        Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>, linux-next@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <haveblue@...ibm.com>
Subject: driver-core: kobject verification fixup

On Wed, 30 Jul 2008 09:06:50 +0200 Bernhard Walle <bwalle@...e.de> wrote:

> * Greg KH <greg@...ah.com> [2008-07-29 21:48]:
> > > Isn't this the opposite end of the same problem for which Bernhard
> > > has been repeatedly trying to find a taker for his patch:
> > > 
> > > http://article.gmane.org/gmane.linux.kernel.kexec/1882
> > 
> > Yes.  It's not the kobject patch at fault here, it's the use of kobjects
> > so early in the boot process.  That needs to be fixed.

It was a bit optimistic to stick an unconditional GFP_KERNEL allocation
into the previously-atomic kobject_init().

It's only 128 bytes, so why can't we fix both problems thusly?

--- a/lib/kobject.c~a
+++ a/lib/kobject.c
@@ -38,12 +38,10 @@ static int ptr_in_range(void *ptr, void 
 
 static void verify_dynamic_kobject_allocation(struct kobject *kobj)
 {
-	char *namebuf;
+	char namebuf[KSYM_NAME_LEN];
 	const char *ret;
 
-	namebuf = kzalloc(KSYM_NAME_LEN, GFP_KERNEL);
-	ret = kallsyms_lookup((unsigned long)kobj, NULL, NULL, NULL,
-			namebuf);
+	ret = kallsyms_lookup((unsigned long)kobj, NULL, NULL, NULL, namebuf);
 	/*
 	 * This is the X86_32-only part of this function.
 	 * This is here because it is valid to have a kobject
@@ -63,7 +61,7 @@ static void verify_dynamic_kobject_alloc
 	/* dump_stack(); */
 	pr_debug("---- end silly warning ----\n");
 out:
-	kfree(namebuf);
+	return;
 }
 #else
 static void verify_dynamic_kobject_allocation(struct kobject *kobj) { }
_


> Yes, but if somebody could tell me why nobody takes the patch, I would
> be happy. Then I would be able to improve the patch. :)

Copy me on the patch.  Then I merge it and people know there will be no
hiding from it.

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