When compiling with Clang on LoongArch, there exists unreachable entry of
rodata which points to a position after the function return instruction,
this is generated by compiler to fill the non-existent switch case, just
skip the entry when parsing the relocation section of rodata.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 tools/objtool/check.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index cff7416b207e..654cffcf9512 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1986,9 +1986,10 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
 		if (!dest_insn)
 			break;
 
-		/* Make sure the destination is in the same function: */
-		if (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc != pfunc)
-			break;
+		if (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc != pfunc) {
+			prev_offset = reloc_offset(reloc);
+			continue;
+		}
 
 		alt = malloc(sizeof(*alt));
 		if (!alt) {
-- 
2.42.0

On Tue, Dec 17, 2024 at 09:09:00AM +0800, Tiezhu Yang wrote:
> When compiling with Clang on LoongArch, there exists unreachable entry of
> rodata which points to a position after the function return instruction,
> this is generated by compiler to fill the non-existent switch case, just
> skip the entry when parsing the relocation section of rodata.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>  tools/objtool/check.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/objtool/check.c b/tools/objtool/check.c
> index cff7416b207e..654cffcf9512 100644
> --- a/tools/objtool/check.c
> +++ b/tools/objtool/check.c
> @@ -1986,9 +1986,10 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
>  		if (!dest_insn)
>  			break;
>  
> -		/* Make sure the destination is in the same function: */
> -		if (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc != pfunc)
> -			break;
> +		if (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc != pfunc) {
> +			prev_offset = reloc_offset(reloc);
> +			continue;
> +		}

This patch can be dropped, this is already fixed in the -tip tree:

  3724062ca2b1 ("objtool: Ignore dangling jump table entries")

-- 
Josh