From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 34055C71135 for ; Wed, 11 Jun 2025 21:40:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:Message-Id: Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=RYv6fuwYSx+Nj0tD9GequmpjI+T70DSn4qg9hmVoiWw=; b=mi5ga6qAahNiW/kvnMDVxcDK1E ZgxInu1WoQ4fnnOEREJZBll+s+AlyfnHZ8MIRJm3wOAq/Cxt0xWc2wzVXpWIi0+bJvPv+W+89GZzW W7IJmJpfx1f0j1J+oLXKpkQJHsv2JFp1MF4QiJJkoB0gxCRkHj+gNOT0xGTTPNap3Fj2vBIYOE2j5 ffgejg8Esk/GZUmZrCWB0gdDB7r6e3S9L+qFI3Y6qf9bt/CU89HVMgTwkmChYeh3WpD+r3MiOsBlS 8VFI8cwKXhBQ7ysDKGVX9CVkppYxkjOcPVFXsV2G3ZB+NhnlzYVu5968eukSSqoZbnKCtPrTpNppe I63X8Q0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uPTBL-0000000BMk9-11nR; Wed, 11 Jun 2025 21:40:27 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uPOhr-0000000Afix-30q4 for linux-arm-kernel@lists.infradead.org; Wed, 11 Jun 2025 16:53:44 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 4E7A244069; Wed, 11 Jun 2025 16:53:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FC1EC4CEE3; Wed, 11 Jun 2025 16:53:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749660823; bh=RnyH9auVBNB2aIaoFpYtwzDjMiTSZDk0KXkdiyuzoDo=; h=From:Date:Subject:To:Cc:From; b=u91w3VkLCt1rlBnTOloWF8usZKzkddwlPH3q4I0GQ8NxOEU1YZUpN5F04p6sl56LY TVegEtv5YIjBT/gkAbIvhr089ymt3nj2ia8wz/4AGt+1iXxn2KxijgZCeS2G6ALYSf Z+q0GPPZcVBiEeuiDmHAYHTlZTK+iDMac0N3Gua+56J9bdnCkoroCgw7wExOTMSRMm CO6rBMukynKIr8IkoLoQRmrhAoQwYyollgO9wZUqeUy/hGBDPZHbiPjj9gsL7UVbuZ JM0KrT5rb1MLISLi4jZJksz8TrYjnHBL6JjrSvfCKWZhZ6F6aLgxQxZPCfZlIAe5U8 Pj7B9NZIe44Ig== From: Mark Brown Date: Wed, 11 Jun 2025 17:28:13 +0100 Subject: [PATCH] arm64/gcs: Don't call gcs_free() during flush_gcs() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250611-arm64-gcs-flush-thread-v1-1-cc26feeddabd@kernel.org> X-B4-Tracking: v=1; b=H4sIAJyuSWgC/x3MSQrDMAxA0asErStwTMZepXQhbDkWZChSUgIhd 6/p8i3+v8BYhQ2e1QXKXzHZ1oL6UUHItE6MEovBO9+6zo1IunQNTsEwzYdl3LMyRRyIU/LU17G NUOKPcpLzP3697/sH2SqF8GgAAAA= X-Change-ID: 20250609-arm64-gcs-flush-thread-8aeff2a71d5d To: Catalin Marinas , Will Deacon Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-c25d1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1132; i=broonie@kernel.org; h=from:subject:message-id; bh=RnyH9auVBNB2aIaoFpYtwzDjMiTSZDk0KXkdiyuzoDo=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBoSbSV6KcW+wzdUNdaAVIdHETuBky51uFryppRol00 PuB3vJqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaEm0lQAKCRAk1otyXVSH0CCGB/ 9mEMaB4ctpK7VcA2rMXXi1cHbOgcOAf5Fy8UyDkAx+ziIJ0ALWLvuqNpcNPULbloW8eWcSU7D9qUiF sCoozylGtf6zJ/+nv7inDzmfKr9TKpD0yfZQnPMyWiwUtoYtpQuqqhHubFwXPOGrnoqWoYW7yj6Lh3 gF8boGBdvG7wzcKE51zs/s2vO0W1GgTsb6RH0K9KKqOT/Y+qb/QIie/QoSercPJAd/92m7X8/PSyNw 1JVe5y4ceEEeRlUQxY6iovKfkKnWyPTmU9pZGbS+TP8ROazpfUQe96q0JOSTvDEFt2z55Q4Q2J+pQe 5/xbY/nc0orrDX2liWfcgXIe02LyLb X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250611_095343_777665_B2EBAC9F X-CRM114-Status: GOOD ( 10.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Currently we call gcs_free() during flush_gcs() to reset the thread state for GCS. This includes unmapping any kernel allocated GCS, but this is redundant when doing a flush_thread() since we are reinitialisng the thread memory too. Inline the reinitialisaton of the thread struct. Signed-off-by: Mark Brown --- arch/arm64/kernel/process.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index a5ca15daeb8a..5954cec19660 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -288,7 +288,9 @@ static void flush_gcs(void) if (!system_supports_gcs()) return; - gcs_free(current); + current->thread.gcspr_el0 = 0; + current->thread.gcs_base = 0; + current->thread.gcs_size = 0; current->thread.gcs_el0_mode = 0; write_sysreg_s(GCSCRE0_EL1_nTR, SYS_GCSCRE0_EL1); write_sysreg_s(0, SYS_GCSPR_EL0); --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250609-arm64-gcs-flush-thread-8aeff2a71d5d Best regards, -- Mark Brown