From: Rafael J. Wysocki Date: Tue, 11 Mar 2008 23:34:57 +0000 (+0100) Subject: Hibernation: Fix mark_nosave_pages() X-Git-Tag: v2.6.25-rc6~19^2~4^3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a82f7119fd940c1505fc9fdf93d835fa52bc075d;p=pandora-kernel.git Hibernation: Fix mark_nosave_pages() There is a problem in the hibernation code that triggers on some NUMA systems on which pfn_valid() returns 'true' for some PFNs that don't belong to any zone. Namely, there is a BUG_ON() in memory_bm_find_bit() that triggers for PFNs not belonging to any zone and passing the pfn_valid() test. On the affected systems it triggers when we mark PFNs reported by the platform as not saveable, because the PFNs in question belong to a region mapped directly using iorepam() (i.e. the ACPI data area) and they pass the pfn_valid() test. Modify memory_bm_find_bit() so that it returns an error if given PFN doesn't belong to any zone instead of crashing the kernel and ignore the result returned by it in mark_nosave_pages(), while marking the "nosave" memory regions. This doesn't affect the hibernation functionality, as we won't touch the PFNs in question anyway. http://bugzilla.kernel.org/show_bug.cgi?id=9966 . Signed-off-by: Rafael J. Wysocki Signed-off-by: Len Brown --- Reading git-diff-tree failed