Commit eeff7ac6 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar
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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: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/df243063787596e6031367e6659e7e43409d6c6d.1742852846.git.jpoimboe@kernel.org
parent ef753d66

tools/objtool/arch/x86/special.c

+4 −1
Original line number Diff line number Diff line
@@ -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;