linux-kernel - prevent swsusp with PAE

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Message-ID: <20060831135336.GL3923@elf.ucw.cz>
Date:	Thu, 31 Aug 2006 15:53:36 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Andrew Morton <akpm@...l.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: prevent swsusp with PAE

If HIGHMEM64G and swsusp are used at the same time, nasty random
crashes happen during resume. Cause is known; prevent that
combination.

I guess I'd like to see this one in 2.6.18...

Signed-off-by: Pavel Machek <pavel@...e.cz>

---
commit acb3b411ec93f827b25b8481d53670c5c9195d89
tree f52cd5518e34af16fe5ae28064717bcc95929f28
parent cd03e183c58e6e7073e054a7fe335cf50c61fe2f
author <pavel@....ucw.cz> Thu, 31 Aug 2006 15:52:34 +0200
committer <pavel@....ucw.cz> Thu, 31 Aug 2006 15:52:34 +0200

 include/asm-i386/suspend.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/asm-i386/suspend.h b/include/asm-i386/suspend.h
index 08be1e5..01cd812 100644
--- a/include/asm-i386/suspend.h
+++ b/include/asm-i386/suspend.h
@@ -16,6 +16,15 @@ arch_prepare_suspend(void)
 		printk(KERN_ERR "PSE is required for swsusp.\n");
 		return -EPERM;
 	}
+
+#ifdef CONFIG_X86_PAE
+	printk(KERN_ERR "swsusp is incompatible with PAE.\n");
+	/* This is actually instance of the same problem. We need
+	   identity mapping self-contained in swsusp_pg_dir, and PAE
+	   prevents that. Solution could be copied from x86_64. */
+	return -EPERM;
+#endif
+
 	return 0;
 }
 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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