linux-kernel - Re: [1/2] 2.6.22-rc5: known regressions with patches

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Message-Id: <1182381667.2701.7.camel@laptopd505.fenrus.org>
Date:	Wed, 20 Jun 2007 16:21:07 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ian McDonald <ian.mcdonald@...di.co.nz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Ingo Molnar <mingo@...e.hu>,
	"Darrick J. Wong" <djwong@...ibm.com>, Andi Kleen <ak@...e.de>,
	Bj?rn Steinbrink <B.Steinbrink@....de>,
	William Cohen <wcohen@...hat.com>,
	"S. P. Prasanna" <prasanna@...ibm.com>,
	Antonino Daplas <adaplas@...il.com>,
	Olaf Hering <olaf@...fle.de>, Ville Syrj?l? <syrjala@....fi>,
	Jean Delvare <khali@...ux-fr.org>,
	Rudolf Marek <r.marek@...embler.cz>,
	Soeren Sonnenburg <kernel@....de>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: [1/2] 2.6.22-rc5: known regressions with patches


> Kprobes fundamntally disagrees with DEBUG_RODATA, there's no point in 
> "working around it". Better just admit it.

that's wrong. KPROBE fundamentally disagrees with TEXT being read only,
which is a 2.6.22 new "feature".. and a buggy one at that.


the real fix would be something like this instead:

--- linux-2.6.22-rc5/arch/x86_64/mm/init.c.org	2007-06-21 04:20:10.000000000 -0700
+++ linux-2.6.22-rc5/arch/x86_64/mm/init.c	2007-06-21 04:21:01.000000000 -0700
@@ -605,6 +605,11 @@ void mark_rodata_ro(void)
 	if (num_possible_cpus() > 1)
 		start = (unsigned long)_etext;
 #endif
+
+#ifdef CONFIG_KPROBES
+	start = (unsigned long)_etext;
+#endif
+	
 	end = (unsigned long)__end_rodata;
 	start = (start + PAGE_SIZE - 1) & PAGE_MASK;
 	end &= PAGE_MASK;


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