From patchwork Thu Nov 7 01:39:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 841866 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 C1AAB374CB; Thu, 7 Nov 2024 01:43:52 +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=1730943832; cv=none; b=XZrhOySYCdePmMrySK6L3jwXVbhAhD1Qw6SMTAUaQbPNs6L6p7B6/H4jq0ZZStOcI4k3OnSPH3UsERXDdaY0neLPUJuPfUWV3Z7INOjJQ41F3TqzFU6hhcaJmFB0y8KcmFgBF3pkpZOTHcBCfHE2nPLtDhYdOFMKVyuqOtCscqo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730943832; c=relaxed/simple; bh=0bSqJfCBOTI4Jmz4xl8iWhEjG/ZUwMwS5LAsSpOElfs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ZtbuMoUe/TbNk2ZCi2/NWdLL4aGpGUAexpUbSGY19w5QCsbYT7cFsnQ4mJOzKrfyrLc3Zd81a1XaWQxaE/alQMjBmANATbK65qcFBw6bDfmZXOjYx3f+PCQkv/d1Huy9Pn0fcqyETulTWGd/n95E+ckJG3W2qAegVt1sZbpmIKk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hUkKATgw; 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="hUkKATgw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8410C4CED6; Thu, 7 Nov 2024 01:43:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730943832; bh=0bSqJfCBOTI4Jmz4xl8iWhEjG/ZUwMwS5LAsSpOElfs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=hUkKATgwOUiynyRaCLwhg28ZBXndF/nkmS5+NsBGFJ77E7tKRWc/xWWmBq9AWEU20 eg2Hp3nUIYojB8nOZ8XR4cc2XfMip+g6ql6M7kqgmNUcqFN+5fyI3qkR2GL9BeZL9h lh5kXV3HvpngOLIxX8qHzWzCRT7Mtk8un0l5AbzHkvdzN4JxyFQP2CpvWDJMtXjU8i Qx32HnMp3RRo1gRJHT2yEy4/KSqHRSFSYgr+YqFT+xyGbI3TlAzQPguEw1XcXiq4Kt xsCzOIC7X1QZ+N9hhv926A1Q87jHK+ye6aJHB/tDVPJp9TZtBtCzuPcSxLmPmvh8g6 FD3EtRnT8uUAg== From: Mark Brown Date: Thu, 07 Nov 2024 01:39:20 +0000 Subject: [PATCH v2 1/6] kselftest/arm64: Correct misleading comments on fp-stress irritators Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241107-arm64-fp-stress-irritator-v2-1-c4b9622e36ee@kernel.org> References: <20241107-arm64-fp-stress-irritator-v2-0-c4b9622e36ee@kernel.org> In-Reply-To: <20241107-arm64-fp-stress-irritator-v2-0-c4b9622e36ee@kernel.org> To: Catalin Marinas , Will Deacon , Shuah Khan Cc: Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-9b746 X-Developer-Signature: v=1; a=openpgp-sha256; l=2159; i=broonie@kernel.org; h=from:subject:message-id; bh=0bSqJfCBOTI4Jmz4xl8iWhEjG/ZUwMwS5LAsSpOElfs=; b=owGbwMvMwMWocq27KDak/QLjabUkhnQdaf+pybN0Nz+Uf9z3XOk/V30ft+Kz1H8Tmw408aVGujZr OizuZDRmYWDkYpAVU2RZ+yxjVXq4xNb5j+a/ghnEygQyhYGLUwAmoqTB/j/zXSXPHp5Q9wuqnNlTJ/ dy394V1xd7XDPEomniW1H/wPiQuLtZr5umd9tWtG73vXfvHdfeLa+jnz5Q5QtfM0+6Z4r7T73gxzGS du+vftWfu7jsqljFFaWZ69/VPCzc02Dpy2nnEv7UrfmK14N7ETPjZBuvTvqgExTcX7BrAqObn2ntzb /8wso5LZ65i3NXv3R5zKhkrC+16v1Xx1umR2eItCXvuz1rVx3HrLwGO6/921vbCoWOF19u23xCVtTw 6yq/lmAD5bdzZ8unqJ/gSFfu3Xh4tsU35/46hZxQQ7uM5ZtOZEb+/XXNPiw5oP5PjQSjCFPothdGgT 9VT/CcDzwfr31v3vN4bp8Yb+aPAA== X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB The comments in the handlers for the irritator signal in the test threads for fp-stress suggest that the irritator will corrupt the register state observed by the main thread but this is not the case, instead the FPSIMD and SVE irritators (which are the only ones that are implemented) modify the current register state which is expected to be overwritten on return from the handler by the saved register state. Update the comment to reflect what the handler is actually doing. Acked-by: Mark Rutland Signed-off-by: Mark Brown --- tools/testing/selftests/arm64/fp/fpsimd-test.S | 3 +-- tools/testing/selftests/arm64/fp/sve-test.S | 3 +-- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/arm64/fp/fpsimd-test.S b/tools/testing/selftests/arm64/fp/fpsimd-test.S index 8b960d01ed2e0ef516893b68794078ddf8c01e1f..bdfb7cf2e4ec175fda62c1c2f38c6ebb1a1c48bf 100644 --- a/tools/testing/selftests/arm64/fp/fpsimd-test.S +++ b/tools/testing/selftests/arm64/fp/fpsimd-test.S @@ -134,8 +134,7 @@ function check_vreg b memcmp endfunction -// Any SVE register modified here can cause corruption in the main -// thread -- but *only* the registers modified here. +// Modify live register state, the signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23] diff --git a/tools/testing/selftests/arm64/fp/sve-test.S b/tools/testing/selftests/arm64/fp/sve-test.S index fff60e2a25addfd4850ef71aa3cf6535ac880ffd..e3c0d585684df29723a49265f3df6d23817498c7 100644 --- a/tools/testing/selftests/arm64/fp/sve-test.S +++ b/tools/testing/selftests/arm64/fp/sve-test.S @@ -291,8 +291,7 @@ function check_ffr #endif endfunction -// Any SVE register modified here can cause corruption in the main -// thread -- but *only* the registers modified here. +// Modify live register state, the signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23]