Comment # 41 on bug 913885 from Joey Lee

I checked kernel code again "memory size mismatch", before v3.11, it checks
num_physpages global variable should constant between hibernating and resuming.

After v3.11, kernel code changed to use get_num_physpages(), the return value
is from the sum of all node's totalpages.

Checked each dmesg attached on this bug, found 

v3.12:
Description:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.12.36-desktop-bv1
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#28:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.12.37-desktop-bv2
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#31:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.12.37-desktop-bv2
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#36:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.12.38-desktop-bv1
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177256
[    3.334138] PM: Image mismatch: memory size


v3.18:
Comment#5:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.3-1.gc3e148f-desktop 
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#6:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.3-1.gc3e148f-desktop 
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#10:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.3-1.gc3e148f-desktop 
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177256
[    3.834831] PM: Image mismatch: memory size

Comment#20:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.5-desktop-bv2
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#21:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.5-desktop-bv2
root=UUID=2d968229-
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177255

Comment#23:
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.18.5-1.gf378da4-desktop 
[    0.000000] e820: last_pfn = 0x430000 max_arch_pfn = 0x400000000
[    0.000000] e820: last_pfn = 0xcc000 max_arch_pfn = 0x400000000
[    0.000000] On node 0 totalpages: 4177256
[    3.847437] PM: Image mismatch: memory size


As the above part of dmesg, no matter v3.12 or v3.18 kernel, the last_pfn of
e820 always keeps in 0x430000/0xcc000. But the totalpages of node 0 normally is
4177255, but sometimes 4177256. The memory size mismatch always happened when
totalpages=4177256.

Need more detail trace the code of how to calculate totalpages of node, I
suggest open another bug against this new found issue.