linux-kernel - prevent swsusp with PAE

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Date:	Sun, 3 Sep 2006 01:16:54 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Randy.Dunlap" <rdunlap@...otime.net>
Cc:	Andrew Morton <akpm@...l.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: prevent swsusp with PAE

Next version of prevent-swsusp-with-PAE, this time I disable it in
Kconfig.

PAE + swsusp results in hard-to-debug crash about 50% of time during
resume. Cause is known, fix needs to be ported from x86-64 (but we
can't make it to 2.6.18, and I'd like this to be worked around in
2.6.18).

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

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ae44a70..619ecab 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -56,7 +56,7 @@ config PM_TRACE
 
 config SOFTWARE_SUSPEND
 	bool "Software Suspend"
-	depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP)
+	depends on PM && SWAP && ((X86 && (!SMP || SUSPEND_SMP) && !X86_PAE) || ((FRV || PPC32) && !SMP))
 	---help---
 	  Enable the possibility of suspending the machine.
 	  It doesn't need ACPI or APM.
@@ -78,6 +78,10 @@ config SOFTWARE_SUSPEND
 
 	  For more information take a look at <file:Documentation/power/swsusp.txt>.
 
+	  (For now, swsusp is incompatible with PAE aka HIGHMEM_64G on i386.
+	  we need identity mapping for resume to work, and that is trivial
+	  to get with 4MB pages, but less than trivial on PAE).
+
 config PM_STD_PARTITION
 	string "Default resume partition"
 	depends on SOFTWARE_SUSPEND

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

-- 
VGER BF report: U 0.489608
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