[PATCH 1/6] qemu/osdep: Document qemu_memalign() and friends

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Document allocator functions that require a specific
de-allocator call.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/block/block.h          | 4 ++++
 include/qemu/osdep.h           | 3 +++
 include/sysemu/block-backend.h | 2 ++
 3 files changed, 9 insertions(+)

diff --git a/include/block/block.h b/include/block/block.h
index 8b62429aa4..c57fdecf9a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -526,9 +526,13 @@ void bdrv_img_create(const char *filename, const char *fmt,
 size_t bdrv_min_mem_align(BlockDriverState *bs);
 /* Returns optimal alignment in bytes for bounce buffer */
 size_t bdrv_opt_mem_align(BlockDriverState *bs);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_blockalign(BlockDriverState *bs, size_t size);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 20f5c5f197..778c459c22 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -294,8 +294,11 @@ extern int daemon(int, int);
 #endif
 
 int qemu_daemon(int nochdir, int noclose);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_try_memalign(size_t alignment, size_t size);
+/* callers must free the returned pointer with qemu_vfree() */
 void *qemu_memalign(size_t alignment, size_t size);
+/* callers must free the returned pointer with qemu_anon_ram_free() */
 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared);
 void qemu_vfree(void *ptr);
 void qemu_anon_ram_free(void *ptr, size_t size);
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 34de7faa81..f2dcf63ae3 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -203,7 +203,9 @@ uint32_t blk_get_request_alignment(BlockBackend *blk);
 uint32_t blk_get_max_transfer(BlockBackend *blk);
 int blk_get_max_iov(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
+/* callers must free the returned pointer with qemu_vfree() */
 void *blk_try_blockalign(BlockBackend *blk, size_t size);
+/* callers must free the returned pointer with qemu_vfree() */
 void *blk_blockalign(BlockBackend *blk, size_t size);
 bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);
 void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason);
-- 
2.21.3