helpers: support dmesg with RHEL 7

RHEL 7 kernel still uses `struct log *` for a structured kernel log instead of `struct printk_log *`, so lets try to support it. Tested on: * `3.10.0-229` * `3.10.0-1160.80.1` * `3.10.0-1160.83.1` This should have no impact on existing supported cases. Signed-off-by: Oleksandr Natalenko <[email protected]>
osandov · Jul 25, 2023 · 54b1630 · 54b1630
1 parent 470b2e0
commit 54b1630
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/drgn/helpers/linux/printk.py b/drgn/helpers/linux/printk.py
@@ -158,7 +158,14 @@ def add_record(current_id: int) -> None:
 
 
 def _get_printk_records_structured(prog: Program) -> List[PrintkRecord]:
-    printk_logp_type = prog.type("struct printk_log *")
+    try:
+        printk_logp_type = prog.type("struct printk_log *")
+    except LookupError:
+        # Before Linux kernel commit 62e32ac3505a ("printk: rename struct log
+        # to struct printk_log") (in v3.11), records were "struct log" instead
+        # of "struct printk_log". RHEL 7 kernel still uses old naming.
+        printk_logp_type = prog.type("struct log *")
+
     have_caller_id = printk_logp_type.type.has_member("caller_id")
     LOG_CONT = prog["LOG_CONT"].value_()