a couple of small cleanup patches for DSM-related code

From 1fa264cbc3ee7775adaf4a682e2edd229b5b16db Mon Sep 17 00:00:00 2001
From: Nathan Bossart <nathan@postgresql.org>
Date: Wed, 4 Jun 2025 14:24:38 -0500
Subject: [PATCH v1 1/2] fix sign mismatches in test_dsm_registry

---
 src/test/modules/test_dsm_registry/test_dsm_registry.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/test/modules/test_dsm_registry/test_dsm_registry.c b/src/test/modules/test_dsm_registry/test_dsm_registry.c
index 462a80f8790..96a890be228 100644
--- a/src/test/modules/test_dsm_registry/test_dsm_registry.c
+++ b/src/test/modules/test_dsm_registry/test_dsm_registry.c
@@ -54,7 +54,7 @@ set_val_in_shmem(PG_FUNCTION_ARGS)
 	tdr_attach_shmem();
 
 	LWLockAcquire(&tdr_state->lck, LW_EXCLUSIVE);
-	tdr_state->val = PG_GETARG_UINT32(0);
+	tdr_state->val = PG_GETARG_INT32(0);
 	LWLockRelease(&tdr_state->lck);
 
 	PG_RETURN_VOID();
@@ -72,5 +72,5 @@ get_val_in_shmem(PG_FUNCTION_ARGS)
 	ret = tdr_state->val;
 	LWLockRelease(&tdr_state->lck);
 
-	PG_RETURN_UINT32(ret);
+	PG_RETURN_INT32(ret);
 }
-- 
2.39.5 (Apple Git-154)

From 6da53d0ec077ff793694f5930648635f7e3aa954 Mon Sep 17 00:00:00 2001
From: Nathan Bossart <nathan@postgresql.org>
Date: Wed, 4 Jun 2025 14:30:19 -0500
Subject: [PATCH v1 2/2] use NULL instead of 0 for pointer arguments

---
 src/backend/replication/logical/launcher.c | 2 +-
 src/backend/utils/activity/pgstat_shmem.c  | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/backend/replication/logical/launcher.c b/src/backend/replication/logical/launcher.c
index 10677da56b2..1c3c051403d 100644
--- a/src/backend/replication/logical/launcher.c
+++ b/src/backend/replication/logical/launcher.c
@@ -1016,7 +1016,7 @@ logicalrep_launcher_attach_dshmem(void)
 		last_start_times_dsa = dsa_attach(LogicalRepCtx->last_start_dsa);
 		dsa_pin_mapping(last_start_times_dsa);
 		last_start_times = dshash_attach(last_start_times_dsa, &dsh_params,
-										 LogicalRepCtx->last_start_dsh, 0);
+										 LogicalRepCtx->last_start_dsh, NULL);
 	}
 
 	MemoryContextSwitchTo(oldcontext);
diff --git a/src/backend/utils/activity/pgstat_shmem.c b/src/backend/utils/activity/pgstat_shmem.c
index 2e33293b000..53e7d534270 100644
--- a/src/backend/utils/activity/pgstat_shmem.c
+++ b/src/backend/utils/activity/pgstat_shmem.c
@@ -183,7 +183,7 @@ StatsShmemInit(void)
 		p += MAXALIGN(pgstat_dsa_init_size());
 		dsa = dsa_create_in_place(ctl->raw_dsa_area,
 								  pgstat_dsa_init_size(),
-								  LWTRANCHE_PGSTATS_DSA, 0);
+								  LWTRANCHE_PGSTATS_DSA, NULL);
 		dsa_pin(dsa);
 
 		/*
@@ -255,7 +255,8 @@ pgstat_attach_shmem(void)
 	dsa_pin_mapping(pgStatLocal.dsa);
 
 	pgStatLocal.shared_hash = dshash_attach(pgStatLocal.dsa, &dsh_params,
-											pgStatLocal.shmem->hash_handle, 0);
+											pgStatLocal.shmem->hash_handle,
+											NULL);
 
 	MemoryContextSwitchTo(oldcontext);
 }
-- 
2.39.5 (Apple Git-154)