[Crash-utility] [PATCH] Use address_space.__nrpages for RT kernel

[Bernhard Walle]

The patch mapping_nrpages.patch from RT kernel

    Subject: mm/fs: abstract address_space::nrpages
    
    Currently the tree_lock protects mapping->nrpages, this will not be
    possible much longer. Hence abstract the access to this variable so that
    it can be easily replaced by an atomic_ulong_t.
    
    Signed-off-by: Peter Zijlstra <a.p.zijlstra at chello.nl>

renames address_space.nrpages to address_space.__nrpages. This patch implements
that renaming for crash if address_space.nrpages is invalid.


Signed-off-by: Bernhard Walle <bwalle at suse.de>

---
 memory.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/memory.c
+++ b/memory.c
@@ -320,6 +320,9 @@ vm_init(void)
 	MEMBER_OFFSET_INIT(block_device_bd_disk, "block_device", "bd_disk");
 	MEMBER_OFFSET_INIT(inode_i_mapping, "inode", "i_mapping");
 	MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "nrpages");
+	if (INVALID_MEMBER(address_space_nrpages))
+		MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "__nrpages");
+
 	MEMBER_OFFSET_INIT(gendisk_major, "gendisk", "major");
 	MEMBER_OFFSET_INIT(gendisk_fops, "gendisk", "fops");
 	MEMBER_OFFSET_INIT(gendisk_disk_name, "gendisk", "disk_name");