Re: [PATCH v4 2/2] balloon: fix up comments

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On 7/18/19 7:01 AM, Michael S. Tsirkin wrote:
Lots of comments bitrotted. Fix them up.

Fixes: 418a3ab1e778 (mm/balloon_compaction: List interfaces)
Reviewed-by: Wei Wang <wei.w.wang@xxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---

fixes since v3:
	teaks suggested by Wei

  mm/balloon_compaction.c | 71 ++++++++++++++++++++++-------------------
  1 file changed, 39 insertions(+), 32 deletions(-)

diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index d25664e1857b..7e95d2cd185a 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -32,10 +32,10 @@ static void balloon_page_enqueue_one(struct balloon_dev_info *b_dev_info,
   * @b_dev_info: balloon device descriptor where we will insert a new page to
   * @pages: pages to enqueue - allocated using balloon_page_alloc.
   *
- * Driver must call it to properly enqueue a balloon pages before definitively
- * removing it from the guest system.
+ * Driver must call this function to properly enqueue balloon pages before
+ * definitively removing them from the guest system.
   *
- * Return: number of pages that were enqueued.
+ * Returns: number of pages that were enqueued.

According to Documentation/doc-guide/kernel-doc.rst,
this is going in the wrong direction and "Return:" is correct.
Ditto for other occurrences below.

   */
  size_t balloon_page_list_enqueue(struct balloon_dev_info *b_dev_info,
  				 struct list_head *pages)
@@ -63,14 +63,15 @@ EXPORT_SYMBOL_GPL(balloon_page_list_enqueue);
   * @n_req_pages: number of requested pages.
   *
   * Driver must call this function to properly de-allocate a previous enlisted
- * balloon pages before definetively releasing it back to the guest system.
+ * balloon pages before definitively releasing it back to the guest system.
   * This function tries to remove @n_req_pages from the ballooned pages and
   * return them to the caller in the @pages list.
   *
- * Note that this function may fail to dequeue some pages temporarily empty due
- * to compaction isolated pages.
+ * Note that this function may fail to dequeue some pages even if the balloon
+ * isn't empty - since the page list can be temporarily empty due to compaction
+ * of isolated pages.
   *
- * Return: number of pages that were added to the @pages list.
+ * Returns: number of pages that were added to the @pages list.
   */
  size_t balloon_page_list_dequeue(struct balloon_dev_info *b_dev_info,
  				 struct list_head *pages, size_t n_req_pages)
@@ -112,12 +113,13 @@ EXPORT_SYMBOL_GPL(balloon_page_list_dequeue);
/*
   * balloon_page_alloc - allocates a new page for insertion into the balloon
- *			  page list.
+ *			page list.
   *
- * Driver must call it to properly allocate a new enlisted balloon page.
- * Driver must call balloon_page_enqueue before definitively removing it from
- * the guest system.  This function returns the page address for the recently
- * allocated page or NULL in the case we fail to allocate a new page this turn.
+ * Driver must call this function to properly allocate a new balloon page.
+ * Driver must call balloon_page_enqueue before definitively removing the page
+ * from the guest system.
+ *
+ * Returns: struct page for the allocated page or NULL on allocation failure.
   */
  struct page *balloon_page_alloc(void)
  {
@@ -130,19 +132,15 @@ EXPORT_SYMBOL_GPL(balloon_page_alloc);
  /*
   * balloon_page_enqueue - inserts a new page into the balloon page list.
   *
- * @b_dev_info: balloon device descriptor where we will insert a new page to
+ * @b_dev_info: balloon device descriptor where we will insert a new page
   * @page: new page to enqueue - allocated using balloon_page_alloc.
   *
- * Driver must call it to properly enqueue a new allocated balloon page
- * before definitively removing it from the guest system.
+ * Drivers must call this function to properly enqueue a new allocated balloon
+ * page before definitively removing the page from the guest system.
   *
- * Drivers must not call balloon_page_enqueue on pages that have been
- * pushed to a list with balloon_page_push before removing them with
- * balloon_page_pop. To all pages on a list, use balloon_page_list_enqueue
- * instead.
- *
- * This function returns the page address for the recently enqueued page or
- * NULL in the case we fail to allocate a new page this turn.
+ * Drivers must not call balloon_page_enqueue on pages that have been pushed to
+ * a list with balloon_page_push before removing them with balloon_page_pop. To
+ * enqueue a list of pages, use balloon_page_list_enqueue instead.
   */
  void balloon_page_enqueue(struct balloon_dev_info *b_dev_info,
  			  struct page *page)
@@ -157,14 +155,23 @@ EXPORT_SYMBOL_GPL(balloon_page_enqueue);
/*
   * balloon_page_dequeue - removes a page from balloon's page list and returns
- *			  the its address to allow the driver release the page.
+ *			  its address to allow the driver to release the page.
   * @b_dev_info: balloon device decriptor where we will grab a page from.
   *
- * Driver must call it to properly de-allocate a previous enlisted balloon page
- * before definetively releasing it back to the guest system.
- * This function returns the page address for the recently dequeued page or
- * NULL in the case we find balloon's page list temporarily empty due to
- * compaction isolated pages.
+ * Driver must call this function to properly dequeue a previously enqueued page
+ * before definitively releasing it back to the guest system.
+ *
+ * Caller must perform its own accounting to ensure that this
+ * function is called only if some pages are actually enqueued.
+ *
+ * Note that this function may fail to dequeue some pages even if there are
+ * some enqueued pages - since the page list can be temporarily empty due to
+ * the compaction of isolated pages.
+ *
+ * TODO: remove the caller accounting requirements, and allow caller to wait
+ * until all pages can be dequeued.
+ *
+ * Returns: struct page for the dequeued page, or NULL if no page was dequeued.
   */
  struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info)
  {
@@ -177,9 +184,9 @@ struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info)
  	if (n_pages != 1) {
  		/*
  		 * If we are unable to dequeue a balloon page because the page
-		 * list is empty and there is no isolated pages, then something
+		 * list is empty and there are no isolated pages, then something
  		 * went out of track and some balloon pages are lost.
-		 * BUG() here, otherwise the balloon driver may get stuck into
+		 * BUG() here, otherwise the balloon driver may get stuck in
  		 * an infinite loop while attempting to release all its pages.
  		 */
  		spin_lock_irqsave(&b_dev_info->pages_lock, flags);
@@ -230,8 +237,8 @@ int balloon_page_migrate(struct address_space *mapping,
/*
  	 * We can not easily support the no copy case here so ignore it as it
-	 * is unlikely to be use with ballon pages. See include/linux/hmm.h for
-	 * user of the MIGRATE_SYNC_NO_COPY mode.
+	 * is unlikely to be used with balloon pages. See include/linux/hmm.h
+	 * for a user of the MIGRATE_SYNC_NO_COPY mode.
  	 */
  	if (mode == MIGRATE_SYNC_NO_COPY)
  		return -EINVAL;

Reviewed-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
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