From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECF483D8128; Thu, 23 Apr 2026 04:04:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776917078; cv=none; b=fGWQuKDgOk9gFMr63IvNSSkqghNyY98WuHU4yWRjg79IpSvWDa+l8zWQj7JTP1hFRNenSnxN34VPW6/XmVUtgv3ge74DFU+ofPGARpV7KU9q/y35S205NDNmkgQgZZWKwiSPBJHWNSj4a6778XF9ywhsho9UJFczVEtjpF51UFg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776917078; c=relaxed/simple; bh=1Yg1WyHHwy/0H2Hyiv4fKLbjE8nOHP0jcAPFhtPhwmQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=n2ICY44874ELcSpywQ4oOcHc2nqpqauBMjEy3qqJALKS8pILYdjGq8TtaJQd/SpH/rewAhZOi3cR1WWv0McAY4y9uHTmWSS5RchyyKvoC7EdfuWi6nBECUKI3jLMYfgd3tjHIt5ysBvEr2rPnln6XRzsf0k6EG7JivMsTYYzlAM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V+BEhp90; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V+BEhp90" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64267C2BCB5; Thu, 23 Apr 2026 04:04:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776917077; bh=1Yg1WyHHwy/0H2Hyiv4fKLbjE8nOHP0jcAPFhtPhwmQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V+BEhp90S2/pTZYmbAeudjUuutJYGuZirc5cLg+dQE4S4ZuENehhW1QJTpUQNa++m rNkNfdXJsjY8xwq0sbGfEyxRZBkYxKCdgt96zw2Eb7bZQmBzIcQfKK/x0k9WDYgTmy xcJVvAjiOMLPbITUAYdwOcGyaKW8pBG0ERNhwTRjDWt4olhtBp/PQLUxfowV3vvqq5 8qUfqbtLN4bG1CXK8FFml89FMWqG8fIyQhB/zPtteZES5I7H8Hy0XdUuf1MhOLVaWo i2Iwwo0t0xRNFwekJej30uJwjJM2aXOuPW3pbjHWcIceof96Kpf6rDJvQ4lPhiLZcz 8tgJMm8Ld2AXg== From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Peter Zijlstra , Joe Lawrence , Song Liu , Miroslav Benes , Petr Mladek Subject: [PATCH 28/48] objtool/klp: Create empty checksum sections for function-less object files Date: Wed, 22 Apr 2026 21:03:56 -0700 Message-ID: <199a3d975e8e562421edd342b9eda242b4f57a71.1776916871.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: live-patching@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit If an object file has no functions, objtool has nothing to checksum, so it doesn't create the .discard.sym_checksum symbol. Then when 'objtool klp diff' reads symbol checksums, it errors out due to the missing .discard.sym_checksum section. Instead, just create an empty checksum section to signal to read_sym_checksums() that the file has been processed. Signed-off-by: Josh Poimboeuf --- tools/objtool/check.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index f14212a8c179..54ceac857979 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1044,9 +1044,6 @@ static int create_sym_checksum_section(struct objtool_file *file) if (sym->csum.checksum) idx++; - if (!idx) - return 0; - sec = elf_create_section_pair(file->elf, ".discard.sym_checksum", entsize, idx, idx); if (!sec) -- 2.53.0