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 4088D19CD08; Mon, 17 Jun 2024 13:20:59 +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=1718630459; cv=none; b=ek6qmOGlRV0imk4NOQliZ/ifmHVqyIlVUeluUDNZVXhUN3SugOsU1TQQ05zlbBWXmjVBffu/OHavNx1L7vqKOKDjFFcXLSOCbwquYEX+AhsgajtB3JyOYdd5anfwHoKLXFlqKVDbOZ8i0IlnmO1zvuR9lMq2kSWJPv4r6w3U0D4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718630459; c=relaxed/simple; bh=kaqaszhQnjB6MNLzi7ZVRYXuc9INOeh8YqNngcloKc4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=p+fFuwd9u8UjcnQnBrG7ZkWUqEadad/4syRxAqznWJtTP1B3suQLrtXbpKZbRLHZtNa20M+AjwmHJYxuqxev0+wn1BO9f58xeedRJgJGN4W9MePZMlbFfmJsc08syk7kMPnIza/FRQPd0bF25yio7Lj27RZxfUaHzausl4pBMjM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pLbrJBfC; 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="pLbrJBfC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21F87C2BD10; Mon, 17 Jun 2024 13:20:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1718630459; bh=kaqaszhQnjB6MNLzi7ZVRYXuc9INOeh8YqNngcloKc4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pLbrJBfCixCHPUSvgD2TXt64lc7sMc2x0RE6iUDtR/IsOUUeU7pCbJ1efPK7snQNp g+fZBd+ueUk77CgXHRydKp7HD3TK2F9aoClrNmVa4msiX8QD/0jGwreH0ekRlrMwr4 S7SS7dvqRLnjFstEHhMx68skaT+e1cd+89Ntkrb16hBHiGE2UPlvdaNvQr7TmyzWmL AxygjDXl4l6sN2Zbfn9D3djQUOHtFarrHbRG48exH4W9kZP1Dbzi00rfwWbCzRGpas WxPOK/Lcs234oDHrV1owveV1x40fLU7I6ODpgaG9o7aBO/TzDYFQHkftN/9NTOVo23 XwJl6YFb+YOkg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nathan Chancellor , Huacai Chen , Ard Biesheuvel , Sasha Levin , chenhuacai@kernel.org, linux-efi@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH AUTOSEL 6.9 06/44] efi/libstub: zboot.lds: Discard .discard sections Date: Mon, 17 Jun 2024 09:19:19 -0400 Message-ID: <20240617132046.2587008-6-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240617132046.2587008-1-sashal@kernel.org> References: <20240617132046.2587008-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.9.5 Content-Transfer-Encoding: 8bit From: Nathan Chancellor [ Upstream commit 5134acb15d9ef27aa2b90aad46d4e89fcef79fdc ] When building ARCH=loongarch defconfig + CONFIG_UNWINDER_ORC=y using LLVM, there is a warning from ld.lld when linking the EFI zboot image due to the use of unreachable() in number() in vsprintf.c: ld.lld: warning: drivers/firmware/efi/libstub/lib.a(vsprintf.stub.o):(.discard.unreachable+0x0): has non-ABS relocation R_LARCH_32_PCREL against symbol '' If the compiler cannot eliminate the default case for any reason, the .discard.unreachable section will remain in the final binary but the entire point of any section prefixed with .discard is that it is only used at compile time, so it can be discarded via /DISCARD/ in a linker script. The asm-generic vmlinux.lds.h includes .discard and .discard.* in the COMMON_DISCARDS macro but that is not used for zboot.lds, as it is not a kernel image linker script. Add .discard and .discard.* to /DISCARD/ in zboot.lds, so that any sections meant to be discarded at link time are not included in the final zboot image. This issue is not specific to LoongArch, it is just the first architecture to select CONFIG_OBJTOOL, which defines annotate_unreachable() as an asm statement to add the .discard.unreachable section, and use the EFI stub. Closes: https://github.com/ClangBuiltLinux/linux/issues/2023 Signed-off-by: Nathan Chancellor Acked-by: Huacai Chen Signed-off-by: Ard Biesheuvel Signed-off-by: Sasha Levin --- drivers/firmware/efi/libstub/zboot.lds | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/firmware/efi/libstub/zboot.lds b/drivers/firmware/efi/libstub/zboot.lds index ac8c0ef851581..af2c82f7bd902 100644 --- a/drivers/firmware/efi/libstub/zboot.lds +++ b/drivers/firmware/efi/libstub/zboot.lds @@ -41,6 +41,7 @@ SECTIONS } /DISCARD/ : { + *(.discard .discard.*) *(.modinfo .init.modinfo) } } -- 2.43.0