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objtool: Warn when disabling unreachable warnings

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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
This commit is contained in:
Josh Poimboeuf 2025-03-24 14:55:52 -07:00 committed by Ingo Molnar
parent ef753d6605
commit eeff7ac615
1 changed files with 4 additions and 1 deletions
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5
tools/objtool/arch/x86/special.c
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@ -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;