diff options
| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-03-24 14:55:52 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-03-25 09:20:25 +0100 |
| commit | eeff7ac61526a4a9c3916cf46885622078ad886b (patch) | |
| tree | b2a6ab8eac2469ea26f099467cd706e1ad37c438 /tools/objtool/arch | |
| parent | ef753d66051ca03bee1982ce047f9eaf90f81ab4 (diff) | |
objtool: Warn when disabling unreachable warnings
Print a warning when disabling the unreachable warnings (due to a GCC
bug). This will help determine if recent GCCs still have the issue and
alert us if any other issues might be silently lurking behind the
unreachable disablement.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/df243063787596e6031367e6659e7e43409d6c6d.1742852846.git.jpoimboe@kernel.org
Diffstat (limited to 'tools/objtool/arch')
| -rw-r--r-- | tools/objtool/arch/x86/special.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/objtool/arch/x86/special.c b/tools/objtool/arch/x86/special.c index 9c1c9df09aaa..5f46d4e7f7f8 100644 --- a/tools/objtool/arch/x86/special.c +++ b/tools/objtool/arch/x86/special.c @@ -3,6 +3,7 @@ #include <objtool/special.h> #include <objtool/builtin.h> +#include <objtool/warn.h> #define X86_FEATURE_POPCNT (4 * 32 + 23) #define X86_FEATURE_SMAP (9 * 32 + 20) @@ -156,8 +157,10 @@ struct reloc *arch_find_switch_table(struct objtool_file *file, * indicates a rare GCC quirk/bug which can leave dead * code behind. */ - if (reloc_type(text_reloc) == R_X86_64_PC32) + if (reloc_type(text_reloc) == R_X86_64_PC32) { + WARN_INSN(insn, "ignoring unreachables due to jump table quirk"); file->ignore_unreachables = true; + } *table_size = 0; return rodata_reloc; |