From: Josh Poimboeuf Date: Mon, 9 Mar 2026 16:03:05 +0000 (-0700) Subject: objtool: Fix Clang jump table detection X-Git-Tag: v7.0-rc5~7^2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e5019216402ad0b4a84cff457b662d26803f103;p=thirdparty%2Flinux.git objtool: Fix Clang jump table detection With Clang, there can be a conditional forward jump between the load of the jump table address and the indirect branch. Fixes the following warning: vmlinux.o: warning: objtool: ___bpf_prog_run+0x1c5: sibling call from callable instruction with modified stack frame Reported-by: Arnd Bergmann Closes: https://lore.kernel.org/a426d669-58bb-4be1-9eaa-6f3d83109e2d@app.fastmail.com Link: https://patch.msgid.link/7d8600caed08901b6679767488acd639f6df9688.1773071992.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf --- diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 91b3ff4803cf..b6765e876507 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2184,12 +2184,11 @@ static void mark_func_jump_tables(struct objtool_file *file, last = insn; /* - * Store back-pointers for unconditional forward jumps such + * Store back-pointers for forward jumps such * that find_jump_table() can back-track using those and * avoid some potentially confusing code. */ - if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest && - insn->offset > last->offset && + if (insn->jump_dest && insn->jump_dest->offset > insn->offset && !insn->jump_dest->first_jump_src) {