stackdepot-rename-pool_index-to-pool_index_plus_1.patch removed from -mm tree

The quilt patch titled
Subject: stackdepot: rename pool_index to pool_index_plus_1
has been removed from the -mm tree. Its filename was
stackdepot-rename-pool_index-to-pool_index_plus_1.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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From: Peter Collingbourne <[email protected]>
Subject: stackdepot: rename pool_index to pool_index_plus_1
Date: Mon, 1 Apr 2024 17:14:58 -0700

Commit 3ee34eabac2a ("lib/stackdepot: fix first entry having a 0-handle") changed the meaning of the pool_index field to mean "the pool index plus 1". This made the code accessing this field less self-documenting, as well as causing debuggers such as drgn to not be able to easily remain compatible with both old and new kernels, because they typically do that by testing for presence of the new field. Because stackdepot is a debugging tool, we should make sure that it is debugger friendly. Therefore, give the field a different name to improve readability as well as enabling debugger backwards compatibility.

This is needed in 6.9, which would otherwise become an odd release with the new semantics and old name so debuggers wouldn't recognize the new semantics there.

---

 include/linux/stackdepot.h |    7 +++----
 lib/stackdepot.c           |    4 ++--
 2 files changed, 5 insertions(+), 6 deletions(-)

@@ -44,10 +44,9 @@ typedef u32 depot_stack_handle_t;
 union handle_parts {
 	depot_stack_handle_t handle;
 	struct {
-		/* pool_index is offset by 1 */
-		u32 pool_index	: DEPOT_POOL_INDEX_BITS;
-		u32 offset	: DEPOT_OFFSET_BITS;
-		u32 extra	: STACK_DEPOT_EXTRA_BITS;
+		u32 pool_index_plus_1	: DEPOT_POOL_INDEX_BITS;
+		u32 offset		: DEPOT_OFFSET_BITS;
+		u32 extra		: STACK_DEPOT_EXTRA_BITS;
 	};
 };
 

@@ -330,7 +330,7 @@ static struct stack_record *depot_pop_fr
 	stack = current_pool + pool_offset;
 
 	/* Pre-initialize handle once. */
-	stack->handle.pool_index = pool_index + 1;
+	stack->handle.pool_index_plus_1 = pool_index + 1;
 	stack->handle.offset = pool_offset >> DEPOT_STACK_ALIGN;
 	stack->handle.extra = 0;
 	INIT_LIST_HEAD(&stack->hash_list);

@@ -441,7 +441,7 @@ static struct stack_record *depot_fetch_
 	const int pools_num_cached = READ_ONCE(pools_num);
 	union handle_parts parts = { .handle = handle };
 	void *pool;
-	u32 pool_index = parts.pool_index - 1;
+	u32 pool_index = parts.pool_index_plus_1 - 1;
 	size_t offset = parts.offset << DEPOT_STACK_ALIGN;
 	struct stack_record *stack;
 

_

Patches currently in -mm which might be from [email protected] are