[PATCH 1/2] kallsyms: add symbol size for kallsyms symbols that can change size

Add symbol size for kallsyms symbols that can change size so that sizes
can be determined easily without having to manually calculate them
when inspecting the object files (.tmp_vmlinux?.kallsyms.o or
.tmp_vmlinux?). Without, the assembler records the symbol size as 0.

This is primarily useful as a debugging aid in case of linker errors as
part of link-vmlinux.sh, and because symbol size doesn't have to align
with the offset to the next symbol due to padding/alignment.

Signed-off-by: André Draszik <[email protected]>

---
I've opted to only add this for symbols that can change between runs
where relevant, in particular kallsyms_num_syms and
kallsyms_token_index have a static size. While kallsyms_seqs_of_names
depends on table_cnt, kallsyms_offsets does so as well, i.e. is covered
already.

If you think for consistency just to do this for all symbols, please
let me know.
---
 scripts/kallsyms.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 37d5c095ad22..494852ade6d8 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -398,11 +398,13 @@ static void write_src(void)
 		strcpy((char *)table[i]->sym, buf);
 		printf("\t/* %s */\n", table[i]->sym);
 	}
+	printf(".size kallsyms_names, . - kallsyms_names\n");
 	printf("\n");
 
 	output_label("kallsyms_markers");
 	for (i = 0; i < markers_cnt; i++)
 		printf("\t.long\t%u\n", markers[i]);
+	printf(".size kallsyms_markers, . - kallsyms_markers\n");
 	printf("\n");
 
 	free(markers);
@@ -415,6 +417,7 @@ static void write_src(void)
 		printf("\t.asciz\t\"%s\"\n", buf);
 		off += strlen(buf) + 1;
 	}
+	printf(".size kallsyms_token_table, . - kallsyms_token_table\n");
 	printf("\n");
 
 	output_label("kallsyms_token_index");
@@ -441,6 +444,7 @@ static void write_src(void)
 			       (unsigned int)table[i]->addr, table[i]->sym);
 		}
 	}
+	printf(".size kallsyms_offsets, . - kallsyms_offsets\n");
 	printf("\n");
 
 	sort_symbols_by_name();

-- 
2.55.0.229.g6434b31f56-goog