stackdepot: rename pool_index to pool_index_plus_1
Commit3ee34eabac
("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. Fixes:3ee34eabac
("lib/stackdepot: fix first entry having a 0-handle") Link: https://lkml.kernel.org/r/20240402001500.53533-1-pcc@google.com Link: https://linux-review.googlesource.com/id/Ib3e70c36c1d230dd0a118dc22649b33e768b9f88 Signed-off-by: Peter Collingbourne <pcc@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Alexander Potapenko <glider@google.com> Acked-by: Marco Elver <elver@google.com> Acked-by: Oscar Salvador <osalvador@suse.de> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Omar Sandoval <osandov@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -44,10 +44,9 @@ typedef u32 depot_stack_handle_t;
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union handle_parts {
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union handle_parts {
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depot_stack_handle_t handle;
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depot_stack_handle_t handle;
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struct {
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struct {
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/* pool_index is offset by 1 */
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u32 pool_index_plus_1 : DEPOT_POOL_INDEX_BITS;
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u32 pool_index : DEPOT_POOL_INDEX_BITS;
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u32 offset : DEPOT_OFFSET_BITS;
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u32 offset : DEPOT_OFFSET_BITS;
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u32 extra : STACK_DEPOT_EXTRA_BITS;
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u32 extra : STACK_DEPOT_EXTRA_BITS;
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};
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};
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};
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};
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@ -330,7 +330,7 @@ static struct stack_record *depot_pop_free_pool(void **prealloc, size_t size)
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stack = current_pool + pool_offset;
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stack = current_pool + pool_offset;
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/* Pre-initialize handle once. */
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/* Pre-initialize handle once. */
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stack->handle.pool_index = pool_index + 1;
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stack->handle.pool_index_plus_1 = pool_index + 1;
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stack->handle.offset = pool_offset >> DEPOT_STACK_ALIGN;
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stack->handle.offset = pool_offset >> DEPOT_STACK_ALIGN;
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stack->handle.extra = 0;
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stack->handle.extra = 0;
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INIT_LIST_HEAD(&stack->hash_list);
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INIT_LIST_HEAD(&stack->hash_list);
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@ -441,7 +441,7 @@ static struct stack_record *depot_fetch_stack(depot_stack_handle_t handle)
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const int pools_num_cached = READ_ONCE(pools_num);
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const int pools_num_cached = READ_ONCE(pools_num);
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union handle_parts parts = { .handle = handle };
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union handle_parts parts = { .handle = handle };
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void *pool;
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void *pool;
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u32 pool_index = parts.pool_index - 1;
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u32 pool_index = parts.pool_index_plus_1 - 1;
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size_t offset = parts.offset << DEPOT_STACK_ALIGN;
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size_t offset = parts.offset << DEPOT_STACK_ALIGN;
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struct stack_record *stack;
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struct stack_record *stack;
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