From patchwork Mon Jan 24 17:47:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 12722596 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE9C7C433FE for ; Mon, 24 Jan 2022 17:48:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241434AbiAXRsq (ORCPT ); Mon, 24 Jan 2022 12:48:46 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:50182 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243906AbiAXRsm (ORCPT ); Mon, 24 Jan 2022 12:48:42 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BEBABB811AF for ; Mon, 24 Jan 2022 17:48:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8857C340EA; Mon, 24 Jan 2022 17:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643046520; bh=ThFMwJ0Z02qJRhD4h5Bc2RqdVZ6t14LcClyaFeEEQi4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TdxRILxMfV9Zs31ARbIK5FYH+71Vm8IpR/ArYJncxI3n5gU9bv5cMuiFTEWh2enMk rjAUq0SS4AGgCdP4nfZS2HHzeCh33OLRIgNcC2ZFwK7Y3laGQ9SGOR1aABYTbBG8dR zzGkGwiwCszgg6DLiNFABA4memmx2DKctENaDoKNrbhUsgs3IXwEi1s7bVzSZZDPxr 6Eg3Yzupv3WtpPJXjyJP3v5dKZm43NGqKu+7NZ908R4qwaMtZgOPT1baQ0B/is2mHj NEQYP+4QjNmJICOhKPTaeYEsiQtdPj6N8nIr0bDKEaILjqX9DnXAqkH4Ra2wVO05+6 WQaU5okXBWKOQ== From: Ard Biesheuvel To: linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org Cc: linux-hardening@vger.kernel.org, Ard Biesheuvel , Nicolas Pitre , Arnd Bergmann , Kees Cook , Keith Packard , Linus Walleij , Nick Desaulniers , Tony Lindgren , Marc Zyngier , Vladimir Murzin , Jesse Taube Subject: [PATCH v5 14/32] ARM: use TLS register for 'current' on !SMP as well Date: Mon, 24 Jan 2022 18:47:26 +0100 Message-Id: <20220124174744.1054712-15-ardb@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220124174744.1054712-1-ardb@kernel.org> References: <20220124174744.1054712-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1013; h=from:subject; bh=ThFMwJ0Z02qJRhD4h5Bc2RqdVZ6t14LcClyaFeEEQi4=; b=owEB7QES/pANAwAKAcNPIjmS2Y8kAcsmYgBh7uYcXrMDmFTsTLbtaBR/X+iSsDU8OPa877TVlaW2 E4ENHCOJAbMEAAEKAB0WIQT72WJ8QGnJQhU3VynDTyI5ktmPJAUCYe7mHAAKCRDDTyI5ktmPJAbQDA C0biuSI2R3kQ6eOpyGeKMsUryIHLOV8r82g1TFN0fP09PhesDFyEcRiY8CmzUzoRkZlGqgv0ZX/DfK BdFI2pweirb8FwXB2bR/3LJa3/Zs622nb2uYtFhC0csJueFh3YvG7Y5qvR578aHN9iEGgIPA/sUZk7 QI+/kMU7+Z/Vz1enHiVfOZaWSgc84WrEbyT1gyljnZ0QTT0/eK/CVr9w5mCJPCchYD0cGBxo7bg7Yk X/iyzwWIW+BI+tW53qqIiNlFYn0Ghapao/bDzDCMrNQvQceR6ujLasbHrYYe18yPUV6UIk8WYAJPls uukiGGPMpS/G3uzR03t6Qiw3Urj807CXXZNzvZMteF6xHHSUIjrstQ6jYxRVCphrxGYuFm3Oxxf7g/ U7Ctv8fmlPy4mzPdSbpt4h5zgHXDSiFJbbxNk2k2HU6EkacobN7AeWIm4Zbk4kpD2EMrQqCHXrMyeB RW8A7NVLHpkObeD44sBK5p7HTBgfr1fWMpA84QjmOUzuk= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org Enable the use of the TLS register to hold the 'current' pointer also on non-SMP configurations that target v6k or later CPUs. This will permit the use of THREAD_INFO_IN_TASK as well as IRQ stacks and vmap'ed stacks for such configurations. Acked-by: Linus Walleij Acked-by: Nicolas Pitre Acked-by: Arnd Bergmann Signed-off-by: Ard Biesheuvel Tested-by: Marc Zyngier Tested-by: Vladimir Murzin # ARMv7M --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 9586636289d2..0e1b93de10b4 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1163,7 +1163,7 @@ config SMP_ON_UP config CURRENT_POINTER_IN_TPIDRURO def_bool y - depends on SMP && CPU_32v6K && !CPU_V6 + depends on CPU_32v6K && !CPU_V6 config ARM_CPU_TOPOLOGY bool "Support cpu topology definition"