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

[André Draszik]

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 <andre.draszik@xxxxxxxxxx>

---
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