From nobody Tue Oct 7 18:22:21 2025 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 09DAF2135CE; Mon, 7 Jul 2025 19:39:34 +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=1751917175; cv=none; b=sb/vpHpHMewmM74ZPCSIrPhMe8/jqhi5Tk2ENoD0twejXV2xWH8LmohMnOfd+g3w08YOOdeF/B/9rwvJbjx0HmggsfGczbkVWnN4GgdMA8XFiXFojiZC++bZiFrIeXceIgHrC2v1jr2LyOhDbBEcCVEB21BWY9c5RIQa6iTd1vQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751917175; c=relaxed/simple; bh=vD+Zu2itQbTuNoEYx5YOHNiH1Sj1hED/r1A1/mPbDF8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=nz/OhmS709qvYpilF9oqXul4n67rgYTKr6u7KEyRA6T/wxLXVYy1brihuozLRLRpCNb62wQwTV83+lIjUsKzqRiV5Z+9tE8P981zKqDjlnMOnAw2v0Jaodq1vtUdTcP6+ptl5L/piSX5lo13cBFl7LxoQ/N2NcEZ6t2iygEnvvw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nXMbflxZ; 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="nXMbflxZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3713CC4CEE3; Mon, 7 Jul 2025 19:39:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751917174; bh=vD+Zu2itQbTuNoEYx5YOHNiH1Sj1hED/r1A1/mPbDF8=; h=From:Date:Subject:To:Cc:From; b=nXMbflxZm2eHRoBHA21zgMYOHf3a9FRcSEESAeBJUVTHl47ClDJGsKe3DIIA7zpj+ EuSDQCYoXWkDOxyVr1WicSnSb4cujoNmuLPyVxSThA0gZz2NO5JP+P/LHNDlKdTzJp m1Ixe1lwd260HrmQwZvGo6mxY40SFIX4jTp4OALG0Rm1opToiAkKM01/N66qjh1TcX fAvFJ/hUQqYGEQbvFWJ8ls/lXGfzI3vBFWgdsERCjnTz23I2v8NtVNn3WZMGDAoi63 Z94AVMv4ybHd5xTh5HsCRWJhsYVTmoa8mws4Lsl/yvSa8dC8KjZlz2UVJEsVrbiwRJ YF+rByvr/wb+w== From: Nathan Chancellor Date: Mon, 07 Jul 2025 12:39:26 -0700 Subject: [PATCH] ARM: Fix allowing linker DCE with binutils < 2.36 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250707-arm-fix-dce-older-binutils-v1-1-3b5e59dc3b26@kernel.org> X-B4-Tracking: v=1; b=H4sIAG4ibGgC/x3M0QpAMBSA4VfRuXZqFg2vIhebHZxidIaUvLvl8 qu//4FIwhShzR4QujjyFhKKPINhtmEiZJ8MWulKGWXQyooj3+gHwm3xJOg4nAcvEWtjK1u6Wje +gTTYhVL5z7v+fT+xNyabbAAAAA== X-Change-ID: 20250707-arm-fix-dce-older-binutils-87a5a4b829d9 To: Russell King , Linus Walleij Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Rob Landley , Nathan Chancellor X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1782; i=nathan@kernel.org; h=from:subject:message-id; bh=vD+Zu2itQbTuNoEYx5YOHNiH1Sj1hED/r1A1/mPbDF8=; b=owGbwMvMwCUmm602sfCA1DTG02pJDBk5SiU2k0On3muc5uQicD7hcN6pWTYF9+Se1Wkt9ZiQz RboPKm1o5SFQYyLQVZMkaX6sepxQ8M5ZxlvnJoEM4eVCWQIAxenAEwk4w0jw6QPX94Wzzp2wPiS 5jMrCaYl8a9udTB+8+W3vX5GsGBzzyuG/2m99/UiZcK5xPLdxK9IFv1+ubXT0Deis9ng15Yzb1I 6WAA= X-Developer-Key: i=nathan@kernel.org; a=openpgp; fpr=2437CB76E544CB6AB3D9DFD399739260CB6CB716 Commit e7607f7d6d81 ("ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE") accidentally broke the binutils version restriction that was added in commit 0d437918fb64 ("ARM: 9414/1: Fix build issue with LD_DEAD_CODE_DATA_ELIMINATION"), reintroducing the segmentation fault addressed by that workaround. Restore the binutils version dependency by using CONFIG_LD_CAN_USE_KEEP_IN_OVERLAY as an additional condition to ensure that CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION is only enabled with binutils >=3D 2.36 and ld.lld >=3D 21.0.0. Cc: stable@vger.kernel.org Fixes: e7607f7d6d81 ("ARM: 9443/1: Require linker to support KEEP within OV= ERLAY for DCE") Reported-by: Rob Landley Closes: https://lore.kernel.org/6739da7d-e555-407a-b5cb-e5681da71056@landle= y.net/ Tested-by: Rob Landley Signed-off-by: Nathan Chancellor --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 3072731fe09c..962451e54fdd 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -121,7 +121,7 @@ config ARM select HAVE_KERNEL_XZ select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M select HAVE_KRETPROBES if HAVE_KPROBES - select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >=3D 23600 || LD= _CAN_USE_KEEP_IN_OVERLAY) + select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >=3D 23600 || LD= _IS_LLD) && LD_CAN_USE_KEEP_IN_OVERLAY select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI select HAVE_OPTPROBES if !THUMB2_KERNEL --- base-commit: d7b8f8e20813f0179d8ef519541a3527e7661d3a change-id: 20250707-arm-fix-dce-older-binutils-87a5a4b829d9 Best regards, -- =20 Nathan Chancellor