[PATCH] kernel/power/snapshot: Add missing kernel-doc parameter descriptions

[Ronan Marchal]

Add missing parameter descriptions in kernel-doc comments to fix
warnings reported by scripts/kernel-doc -none.

Signed-off-by: Ronan Marchal <ronanmarchal29@xxxxxxxxx>
---
 kernel/power/snapshot.c | 62 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 58 insertions(+), 4 deletions(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index a564650734dc..65e5839f3921 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -460,6 +460,11 @@ static struct rtree_node *alloc_rtree_node(gfp_t gfp_mask, int safe_needed,
 
 /**
  * add_rtree_block - Add a new leave node to the radix tree.
+ * @gfp_mask: GFP mask for the allocation.
+ * @safe_needed: Get pages not used before hibernation (restore only)
+ * @ca: Pointer to a linked list of pages ("a chain") to allocate from
+ * @zone: The radix tree zone bitmap whose blocks counter tracks
+ *        the position of the next leave node to allocate.
  *
  * The leave nodes need to be allocated in order to keep the leaves
  * linked list in order. This is guaranteed by the zone->blocks
@@ -530,10 +535,15 @@ static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone,
 
 /**
  * create_zone_bm_rtree - Create a radix tree for one zone.
+ * @gfp_mask: GFP mask for the allocation.
+ * @safe_needed: Get pages not used before hibernation (restore only).
+ * @ca: Pointer to a linked list of pages ("a chain") to allocate from.
+ * @start: Start PFN of the zone.
+ * @end: End PFN of the zone.
  *
- * Allocated the mem_zone_bm_rtree structure and initializes it.
- * This function also allocated and builds the radix tree for the
- * zone.
+ * Allocates and initializes the mem_zone_bm_rtree structure, including
+ * its nodes and leaves lists. Builds the radix tree by allocating the
+ * number of blocks required to cover all pages in the [@start, @end] range.
  */
 static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask,
 						      int safe_needed,
@@ -568,6 +578,8 @@ static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask,
 
 /**
  * free_zone_bm_rtree - Free the memory of the radix tree.
+ * @zone: The radix tree to free.
+ * @clear_nosave_free: If set, clear the PageNosaveFree bit for the page.
  *
  * Free all node pages of the radix tree. The mem_zone_bm_rtree
  * structure itself is not freed here nor are the rtree_node
@@ -680,6 +692,11 @@ static int create_mem_extents(struct list_head *list, gfp_t gfp_mask)
 
 /**
  * memory_bm_create - Allocate memory for a memory bitmap.
+ * @bm: Memory bitmap.
+ * @gfp_mask: GFP mask for the allocation.
+ * @safe_needed: Get pages not used before hibernation (restore only).
+ *
+ * Allocate memory for a memory bitmap and initialize it.
  */
 static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask,
 			    int safe_needed)
@@ -723,6 +740,8 @@ static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask,
 /**
  * memory_bm_free - Free memory occupied by the memory bitmap.
  * @bm: Memory bitmap.
+ * @clear_nosave_free: If set, clear the PageNosaveFree bit for the page.
+ *
  */
 static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
 {
@@ -738,6 +757,10 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
 
 /**
  * memory_bm_find_bit - Find the bit for a given PFN in a memory bitmap.
+ * @bm: Memory bitmap.
+ * @pfn: The page frame number to find.
+ * @addr: The address of the memory page containing the bit for @pfn.
+ * @bit_nr: The bit index within the page for @pfn.
  *
  * Find the bit in memory bitmap @bm that corresponds to the given PFN.
  * The cur.zone, cur.block and cur.node_pfn members of @bm are updated.
@@ -881,6 +904,7 @@ static bool memory_bm_pfn_present(struct memory_bitmap *bm, unsigned long pfn)
 
 /*
  * rtree_next_node - Jump to the next leaf node.
+ * @bm: Memory bitmap.
  *
  * Set the position to the beginning of the next node in the
  * memory bitmap. This is either the next node in the current
@@ -990,6 +1014,8 @@ static void memory_bm_recycle(struct memory_bitmap *bm)
 
 /**
  * register_nosave_region - Register a region of unsaveable memory.
+ * @start_pfn: The starting page frame number.
+ * @end_pfn: The ending page frame number.
  *
  * Register a range of page frames the contents of which should not be saved
  * during hibernation (to be used in the early initialization code).
@@ -1307,6 +1333,8 @@ static unsigned int count_free_highmem_pages(void)
 
 /**
  * saveable_highmem_page - Check if a highmem page is saveable.
+ * @zone: The zone to which the page belongs.
+ * @pfn: The page frame number of the page to check.
  *
  * Determine whether a highmem page should be included in a hibernation image.
  *
@@ -1364,6 +1392,8 @@ static unsigned int count_highmem_pages(void)
 
 /**
  * saveable_page - Check if the given page is saveable.
+ * @zone: The zone to which the page belongs.
+ * @pfn: The page frame number of the page to check.
  *
  * Determine whether a non-highmem page should be included in a hibernation
  * image.
@@ -1442,6 +1472,8 @@ static inline bool do_copy_page(long *dst, long *src)
 
 /**
  * safe_copy_page - Copy a page in a safe way.
+ * @dst: The destination address to copy to.
+ * @s_page: The source page to copy from.
  *
  * Check if the page we are going to copy is marked as present in the kernel
  * page tables. This always is the case if CONFIG_DEBUG_PAGEALLOC or
@@ -1688,7 +1720,10 @@ static unsigned long preallocate_image_highmem(unsigned long nr_pages)
 }
 
 /**
- *  __fraction - Compute (an approximation of) x * (multiplier / base).
+ * __fraction - Compute (an approximation of) x * (multiplier / base).
+ * @x: The value to multiply.
+ * @multiplier: The numerator of the fraction.
+ * @base: The denominator of the fraction.
  */
 static unsigned long __fraction(u64 x, u64 multiplier, u64 base)
 {
@@ -1984,6 +2019,7 @@ int hibernate_preallocate_memory(void)
 #ifdef CONFIG_HIGHMEM
 /**
  * count_pages_for_highmem - Count non-highmem pages needed for copying highmem.
+ * @nr_highmem: Number of highmem pages to copy.
  *
  * Compute the number of non-highmem pages that will be necessary for creating
  * copies of highmem pages.
@@ -2005,6 +2041,11 @@ static unsigned int count_pages_for_highmem(unsigned int nr_highmem) { return 0;
 
 /**
  * enough_free_mem - Check if there is enough free memory for the image.
+ * @nr_pages: Number of non-highmem pages to copy.
+ * @nr_highmem: Number of highmem pages to copy.
+ *
+ * Check if there are enough free non-highmem pages available to save
+ * the hibernation image.
  */
 static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
 {
@@ -2025,6 +2066,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
 #ifdef CONFIG_HIGHMEM
 /**
  * get_highmem_buffer - Allocate a buffer for highmem pages.
+ * @safe_needed: The type of pages to allocate for the buffer.
  *
  * If there are some highmem pages in the hibernation image, we may need a
  * buffer to copy them and/or load their data.
@@ -2037,6 +2079,8 @@ static inline int get_highmem_buffer(int safe_needed)
 
 /**
  * alloc_highmem_pages - Allocate some highmem pages for the image.
+ * @bm: Memory bitmap.
+ * @nr_highmem: Number of highmem pages to allocate.
  *
  * Try to allocate as many pages as needed, but if the number of free highmem
  * pages is less than that, allocate them all.
@@ -2067,6 +2111,9 @@ static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm,
 
 /**
  * swsusp_alloc - Allocate memory for hibernation image.
+ * @copy_bm: Memory bitmap.
+ * @nr_pages: Number of non-highmem pages to allocate.
+ * @nr_highmem: Number of highmem pages to allocate.
  *
  * We first try to allocate as many highmem pages as there are
  * saveable highmem pages in the system.  If that fails, we allocate
@@ -2294,6 +2341,7 @@ static void duplicate_memory_bitmap(struct memory_bitmap *dst,
 
 /**
  * mark_unsafe_pages - Mark pages that were used before hibernation.
+ * @bm: Memory bitmap.
  *
  * Mark the pages that cannot be used for storing the image during restoration,
  * because they conflict with the pages that had been used before hibernation.
@@ -2332,6 +2380,7 @@ static int check_header(struct swsusp_info *info)
 
 /**
  * load_header - Check the image header and copy the data from it.
+ * @info: Structure containing the image header.
  */
 static int load_header(struct swsusp_info *info)
 {
@@ -2485,6 +2534,8 @@ static struct page *last_highmem_page;
 
 /**
  * get_highmem_page_buffer - Prepare a buffer to store a highmem image page.
+ * @page: Pointer to the highmem image page.
+ * @ca: Pointer to the chain allocator structure.
  *
  * For a given highmem image page get a buffer that suspend_write_next() should
  * return to its caller to write to.
@@ -2708,6 +2759,8 @@ static int prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm,
 
 /**
  * get_buffer - Get the address to store the next image data page.
+ * @bm: Memory bitmap.
+ * @ca: Pointer to the chain allocator structure.
  *
  * Get the address that snapshot_write_next() should return to its caller to
  * write to.
@@ -2845,6 +2898,7 @@ int snapshot_write_next(struct snapshot_handle *handle)
 
 /**
  * snapshot_write_finalize - Complete the loading of a hibernation image.
+ * @handle: Snapshot handle structure to guide the writing.
  *
  * Must be called after the last call to snapshot_write_next() in case the last
  * page in the image happens to be a highmem page and its contents should be
-- 
2.53.0