This comment was added almost 5 years ago in commit 41aa4e9fd84
("ram_addr: Split RAMBlock definition"). Clearly it got ignored:

  $ git grep -l system/ramblock.h
  hw/display/virtio-gpu-udmabuf.c
  hw/hyperv/hv-balloon.c
  hw/virtio/vhost-user.c
  migration/dirtyrate.c
  migration/file.c
  migration/multifd-nocomp.c
  migration/multifd-qatzip.c
  migration/multifd-qpl.c
  migration/multifd-uadk.c
  migration/multifd-zero-page.c
  migration/multifd-zlib.c
  migration/multifd-zstd.c
  migration/multifd.c
  migration/postcopy-ram.c
  system/ram-block-attributes.c
  target/i386/kvm/tdx.c
  tests/qtest/fuzz/generic_fuzz.c

At this point it seems saner to just remove it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 include/system/ramblock.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/include/system/ramblock.h b/include/system/ramblock.h
index 87e847e184a..8999206592d 100644
--- a/include/system/ramblock.h
+++ b/include/system/ramblock.h
@@ -11,11 +11,6 @@
  *
  */
 
-/*
- * This header is for use by exec.c and memory.c ONLY.  Do not include it.
- * The functions declared here will be removed soon.
- */
-
 #ifndef SYSTEM_RAMBLOCK_H
 #define SYSTEM_RAMBLOCK_H
 
-- 
2.51.0