meminfo: fix VMALLOC_END with 5-level paging

When 5-level paging is enabled, VMALLOC_SIZE_TB is much larger (see
pgtable_64_types.h as cited in the code). This fixes test failures with
CTF on live kernels (since this is the only way that we can compare
against the real /proc/meminfo).

Sadly, Gitlab is not currently running live CTF tests, so I only found
this during RPM release prep for drgn. CTF testing is definitely
possible for the heavy VM tests, all that is necessary is to get it up
and running. This helps reveal the need for it.

Signed-off-by: Stephen Brennan <[email protected]>

drgn_tools/meminfo.py

@@ -14,6 +14,7 @@
 from drgn import Object
 from drgn import Program
 from drgn.helpers.linux import list_for_each_entry
+from drgn.helpers.linux.boot import pgtable_l5_enabled
 from drgn.helpers.linux.percpu import percpu_counter_sum
 
 from drgn_tools.corelens import CorelensModule
@@ -120,7 +121,7 @@ def get_mm_constants(prog: Program) -> Dict[str, int]:
             # arch/x86/include/asm/pgtable_64_types.h
             _pmd_shift = 21
             if "vmalloc_base" in prog:
-                _vmalloc_size_tb = 32
+                _vmalloc_size_tb = 12800 if pgtable_l5_enabled(prog) else 32
                 mm_consts["VMALLOC_START"] = prog["vmalloc_base"].value_()
                 mm_consts["VMALLOC_END"] = (
                     mm_consts["VMALLOC_START"] + (_vmalloc_size_tb << 40) - 1