perf annotate: Move max_coverage from 'struct annotation' to 'struct annotated_branch'

The max_coverage field is only used when branch stack info is available
so it'd be natural to move to 'struct annotated_branch'.
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231103191907.54531-4-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-annotate.c

@@ -94,6 +94,7 @@ static void process_basic_block(struct addr_map_symbol *start,
 	struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
 	struct block_range_iter iter;
 	struct block_range *entry;
+	struct annotated_branch *branch;
 
 	/*
 	 * Sanity; NULL isn't executable and the CPU cannot execute backwards
@@ -105,6 +106,8 @@ static void process_basic_block(struct addr_map_symbol *start,
 	if (!block_range_iter__valid(&iter))
 		return;
 
+	branch = annotation__get_branch(notes);
+
 	/*
 	 * First block in range is a branch target.
 	 */
@@ -118,8 +121,8 @@ static void process_basic_block(struct addr_map_symbol *start,
 		entry->coverage++;
 		entry->sym = sym;
 
-		if (notes)
-			notes->max_coverage = max(notes->max_coverage, entry->coverage);
+		if (branch)
+			branch->max_coverage = max(branch->max_coverage, entry->coverage);
 
 	} while (block_range_iter__next(&iter));
 

tools/perf/util/annotate.c

@@ -946,7 +946,7 @@ static int __symbol__inc_addr_samples(struct map_symbol *ms,
 	return 0;
 }
 
-static struct annotated_branch *annotation__get_branch(struct annotation *notes)
+struct annotated_branch *annotation__get_branch(struct annotation *notes)
 {
 	if (notes == NULL)
 		return NULL;

tools/perf/util/annotate.h

@@ -280,10 +280,10 @@ struct annotated_branch {
 	unsigned int		total_insn;
 	unsigned int		cover_insn;
 	struct cyc_hist		*cycles_hist;
+	u64			max_coverage;
 };
 
 struct LOCKABLE annotation {
-	u64			max_coverage;
 	u64			start;
 	struct annotation_options *options;
 	struct annotation_line	**offsets;
@@ -355,6 +355,8 @@ static inline struct annotation *symbol__annotation(struct symbol *sym)
 int addr_map_symbol__inc_samples(struct addr_map_symbol *ams, struct perf_sample *sample,
 				 struct evsel *evsel);
 
+struct annotated_branch *annotation__get_branch(struct annotation *notes);
+
 int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
 				    struct addr_map_symbol *start,
 				    unsigned cycles);

tools/perf/util/block-range.c

@@ -311,6 +311,7 @@ struct block_range_iter block_range__create(u64 start, u64 end)
 double block_range__coverage(struct block_range *br)
 {
 	struct symbol *sym;
+	struct annotated_branch *branch;
 
 	if (!br) {
 		if (block_ranges.blocks)
@@ -323,5 +324,9 @@ double block_range__coverage(struct block_range *br)
 	if (!sym)
 		return -1;
 
-	return (double)br->coverage / symbol__annotation(sym)->max_coverage;
+	branch = symbol__annotation(sym)->branch;
+	if (!branch)
+		return -1;
+
+	return (double)br->coverage / branch->max_coverage;
 }