Fix 'mmap' DSM implementation with allocations larger than 4 GB

Fixes bug #18341. Backpatch to all supported versions.

Discussion: https://www.postgresql.org/message-id/18341-ce16599e7fd6228c@postgresql.org

diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c
index 340048a0d1e1b0a156e09d076268d5e5c90e534d..77a195b4836daf8797b66f6a3c910c20ed22a7dd 100644 (file)
--- a/src/backend/storage/ipc/dsm_impl.c
+++ b/src/backend/storage/ipc/dsm_impl.c
@@ -880,7 +880,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
         * transferring data to the kernel.
         */
        char       *zbuffer = (char *) palloc0(ZBUFFER_SIZE);
-       uint32      remaining = request_size;
+       Size        remaining = request_size;
        bool        success = true;
 
        /*