From nobody Sat Oct 11 04:07:52 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 9333C2036F3 for ; Wed, 11 Jun 2025 16:53:43 +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=1749660824; cv=none; b=HHAOAaAxkigHuqsBqYfaO7V3ipuxGSdZ9/zs0tCNA/mSSoiG/WIWXMgBQITJWHdeb9+UxENB/YbAro0Q+Hx5/AGCA3dRDdX3zSi11KZJ45FqUBiplNK2XNYBfkb7KaJFq0/FUi/FMxtTE6Y5Rb+SpSTp2mB67DKZOIxOIfVZeg4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749660824; c=relaxed/simple; bh=RnyH9auVBNB2aIaoFpYtwzDjMiTSZDk0KXkdiyuzoDo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=DTnVBrSxLe/Da0XLZfGLcWJM3wt95OmU9eBNlwO5USsy8N8iRorsZgNHbDJ+l9ZUa2hL3xCfWoQC4aZIcEjhHB04Mf1v2kqvGQwDGBLi8HFYlYc/RxoNxRwcUHh4tkMYhs8lEdem39EwMk6UJCP1tDO+uMZeU3+M+axgDjdVJ2w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=u91w3VkL; 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="u91w3VkL" 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() 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: <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 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 Reviewed-by: Catalin Marinas --- 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; =20 - gcs_free(current); + current->thread.gcspr_el0 =3D 0; + current->thread.gcs_base =3D 0; + current->thread.gcs_size =3D 0; current->thread.gcs_el0_mode =3D 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, --=20 Mark Brown