Messages in this thread Patch in this message | | | Date | Sun, 6 Mar 2005 23:57:30 +0100 | From | Pavel Machek <> | Subject | Re: [Bug 4298] swsusp fails to suspend if CONFIG_DEBUG_PAGEALLOC is also enabled |
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Hi!
> Problem Description: > swsusp normally works, but if I enable CONFIG_DEBUG_PAGEALLOC, it breaks -- > after "PM: snapshotting memory", swsusp never gets to the "critical section" and > it kind of bounces back from the suspend attempt, for lack of a better way for > me to describe the effect.
Okay, that is because low-level assembly requires PSE (4mb pages for kernel) and DEBUG_PAGEALLOC disables that capability.
If you feel like rewriting assembly code to turn off paging (and thus working with PSE), go ahead, but I do not think it is worth the trouble.
OTOH we should at least tell people what went wrong, some people seen same problem on VIA cpus... Please apply,
Signed-off-by: Pavel Machek <pavel@suse.cz>
Pavel
--- clean/include/asm-i386/suspend.h 2004-12-25 13:35:02.000000000 +0100 +++ linux/include/asm-i386/suspend.h 2005-03-02 01:05:33.000000000 +0100 @@ -10,10 +10,12 @@ arch_prepare_suspend(void) { /* If you want to make non-PSE machine work, turn off paging - in do_magic. swsusp_pg_dir should have identity mapping, so + in swsusp_arch_suspend. swsusp_pg_dir should have identity mapping, so it could work... */ - if (!cpu_has_pse) + if (!cpu_has_pse) { + printk(KERN_ERR "PSE is required for swsusp.\n"); return -EPERM; + } return 0; } -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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