scripts/gdb: remove exception handling and refine print format

1. When we crash on a page, we want to check what happened on this
   page instead of skipping this page by try-except block.  Thus, removing
   the try-except block.

2. Remove redundant comma and print the task name properly.

Link: https://lkml.kernel.org/r/20231127070404.4192-4-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 26 insertions, 35 deletions

diff --git a/scripts/gdb/linux/page_owner.py b/scripts/gdb/linux/page_owner.py
index 844fd5d0c912..8e713a09cfe7 100644
--- a/scripts/gdb/linux/page_owner.py
+++ b/scripts/gdb/linux/page_owner.py
@@ -122,27 +122,24 @@ class DumpPageOwner(gdb.Command):
         if not (page_ext['flags'] & (1 << PAGE_EXT_OWNER_ALLOCATED)):
             gdb.write("page_owner is not allocated\n")
 
-        try:
-            page_owner = self.get_page_owner(page_ext)
-            gdb.write("Page last allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\
-                    (page_owner["order"], page_owner["gfp_mask"],\
-                    page_owner["pid"], page_owner["tgid"], page_owner["comm"],\
-                    page_owner["ts_nsec"], page_owner["free_ts_nsec"]))
-            gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags']))
-            if page_owner["handle"] == 0:
-                gdb.write('page_owner allocation stack trace missing\n')
-            else:
-                stackdepot.stack_depot_print(page_owner["handle"])
+        page_owner = self.get_page_owner(page_ext)
+        gdb.write("Page last allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\
+                (page_owner["order"], page_owner["gfp_mask"],\
+                page_owner["pid"], page_owner["tgid"], page_owner["comm"].string(),\
+                page_owner["ts_nsec"], page_owner["free_ts_nsec"]))
+        gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags']))
+        if page_owner["handle"] == 0:
+            gdb.write('page_owner allocation stack trace missing\n')
+        else:
+            stackdepot.stack_depot_print(page_owner["handle"])
 
-            if page_owner["free_handle"] == 0:
-                gdb.write('page_owner free stack trace missing\n')
-            else:
-                gdb.write('page last free stack trace:\n')
-                stackdepot.stack_depot_print(page_owner["free_handle"])
-            if page_owner['last_migrate_reason'] != -1:
-                gdb.write('page has been migrated, last migrate reason: %s\n' % self.migrate_reason_names[page_owner['last_migrate_reason']])
-        except:
-            gdb.write("\n")
+        if page_owner["free_handle"] == 0:
+            gdb.write('page_owner free stack trace missing\n')
+        else:
+            gdb.write('page last free stack trace:\n')
+            stackdepot.stack_depot_print(page_owner["free_handle"])
+        if page_owner['last_migrate_reason'] != -1:
+            gdb.write('page has been migrated, last migrate reason: %s\n' % self.migrate_reason_names[page_owner['last_migrate_reason']])
 
     def read_page_owner(self):
         pfn = self.min_pfn
@@ -173,18 +170,13 @@ class DumpPageOwner(gdb.Command):
                 pfn += 1
                 continue
 
-            try:
-                page_owner = self.get_page_owner(page_ext)
-                gdb.write("Page allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\
-                        (page_owner["order"], page_owner["gfp_mask"],\
-                        page_owner["pid"], page_owner["tgid"], page_owner["comm"],\
-                        page_owner["ts_nsec"], page_owner["free_ts_nsec"]))
-                gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags']))
-                stackdepot.stack_depot_print(page_owner["handle"])
-                pfn += (1 << page_owner["order"])
-                continue
-            except:
-                gdb.write("\n")
-            pfn += 1
+            page_owner = self.get_page_owner(page_ext)
+            gdb.write("Page allocated via order %d, gfp_mask: 0x%x, pid: %d, tgid: %d (%s), ts %u ns, free_ts %u ns\n" %\
+                    (page_owner["order"], page_owner["gfp_mask"],\
+                    page_owner["pid"], page_owner["tgid"], page_owner["comm"].string(),\
+                    page_owner["ts_nsec"], page_owner["free_ts_nsec"]))
+            gdb.write("PFN: %d, Flags: 0x%x\n" % (pfn, page['flags']))
+            stackdepot.stack_depot_print(page_owner["handle"])
+            pfn += (1 << page_owner["order"])
 
 DumpPageOwner()
diff --git a/scripts/gdb/linux/slab.py b/scripts/gdb/linux/slab.py
index f012ba38c7d9..0e2d93867fe2 100644
--- a/scripts/gdb/linux/slab.py
+++ b/scripts/gdb/linux/slab.py
@@ -228,8 +228,7 @@ def slabtrace(alloc, cache_name):
             nr_cpu = gdb.parse_and_eval('__num_online_cpus')['counter']
             if nr_cpu > 1:
                 gdb.write(" cpus=")
-                for i in loc['cpus']:
-                    gdb.write("%d," % i)
+                gdb.write(','.join(str(cpu) for cpu in loc['cpus']))
         gdb.write("\n")
         if constants.LX_CONFIG_STACKDEPOT:
             if loc['handle']: