[PATCH 0/3] perf symbols/callchain/annotate: Bug fixes from symbol reference counting review

[Ian Rogers <irogers@google.com>]

While reviewing the v2 symbol reference counting series [1], Alireza
Haghdoost identified three existing bugs in callchain merging, ELF
zero-size symbol end calculation across .symtab and .dynsym, and basic
block range splitting/cleanup in 'perf annotate'.

Pull these three fixes out ahead of v3 of the main series so they can
land for the v7.4 merge window:

1. perf callchain: Fix loss of symbol in merge_chain_branch()
   Restore .sym = list->ms.sym when constructing the temporary
   struct map_symbol in merge_chain_branch(), fixing missing symbol
   names and inlined frames in 'perf report --children'.

2. perf symbol-elf: Fix zero-size symbol end calculation across .symtab
   and .dynsym
   Move symbols__fixup_end(), symbols__fixup_duplicate(), and
   maps__fixup_end() from dso__load_sym_internal() to dso__load_sym() so
   zero-size .symtab symbols do not get extended across following
   .dynsym-only functions before .dynsym is loaded, and add a unit test
   in 'perf test symbols'.

3. perf annotate: Fix block_range symbol loss on split and leaks on exit
   Preserve .sym = entry->sym when splitting head/tail basic block
   ranges in block_range__create(), add block_ranges__exit(), and release
   resolved branch_info addr_map_symbol references in
   process_branch_stack().

This series was prepared with the assistance of Antigravity and Gemini 4.

Link: https://lore.kernel.org/linux-perf-users/20261027231513.816148-1-irogers@google.com/ [1]
Assisted-by: Antigravity:Gemini-4

Ian Rogers (3):
  perf callchain: Fix loss of symbol in merge_chain_branch()
  perf symbol-elf: Fix zero-size symbol end calculation across .symtab
    and .dynsym
  perf annotate: Fix block_range symbol loss on split and leaks on exit

 tools/perf/builtin-annotate.c |   5 +
 tools/perf/tests/symbols.c    | 169 ++++++++++++++++++++++++++++++++++
 tools/perf/util/block-range.c |  16 ++++
 tools/perf/util/block-range.h |   1 +
 tools/perf/util/callchain.c   |   1 +
 tools/perf/util/symbol-elf.c  |  36 +++++---
 6 files changed, 213 insertions(+), 15 deletions(-)

-- 
2.56.0.317.g454f8302e1-goog