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 03aa47a1049e327dab658a6768e1d30a4e2b4ec2..8dd669e0ce9431a71a010f4bf6b13d8f118eb89d 100644 (file)
--- a/src/backend/storage/ipc/dsm_impl.c
+++ b/src/backend/storage/ipc/dsm_impl.c
@@ -873,7 +873,7 @@ 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;
 
        /*