From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 3964C410D1B for ; Thu, 9 Jul 2026 11:16:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595763; cv=none; b=mNmmVW82rS9opuOvRE1h/yzqYy6gtfhj/GZdreOSvzC1LhCq3mNJb5qe412xo3j5tKrI2fNFQ51KhUo1TzF196mCh/w1Wrnnuc/AfwqQGEarJ4yAZ2xkWzXsz/zklIj8nUzbI2qT/gXIgE/6fEqLrhFQliLwGYlTU62tXsOd4LM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595763; c=relaxed/simple; bh=2OZyqeCMlAjx4K2K+b/k9iOm6BK8Cqfe058LfZSp27I=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=KQEOTOVXPRxu4qkgqavJ3sX3O+TBh4sGeaEigJIDt2x7+d98R3ugQTAAShsZb16dfC/BK/icInKNPaTeQRhAqvGR0DB9GagmihFBvfnpUl53RO9yd8hmNlfdRL2k2oZbSHoHJ+l2Sy4XBHHtic37tIbDxSAQQRcLaaLjWLCa4P0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=ULLpdAqj; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=kMSp+MCX; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="ULLpdAqj"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="kMSp+MCX" Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669AxFRT1434813 for ; Thu, 9 Jul 2026 11:16:00 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= Y/QNMVWz2zbU62zSNYrI+1kG+0GMg+VxTcjcEiOFHtg=; b=ULLpdAqjhcPbhl+a 9wkFVF2/lY0nTNUibaezE3oRQ6lteQ4HDVcOfqHDE7vtflCsPuubuaBt22suHv5C J/GboNexxusvk46SeLD4YSCgJibhGpTyBp7Ew2CmZmE5Kc85FL5xmUGbwX2SNRRm AUKTk+C5LBwuGwFJB3/1RH6SX3HPCEtPeI30OoMKGubID5ux/F8g5HbF1COPW79s OzhxWi76MMCFcorNKYBBg01ItlLF46P4rAQRFOMzzGhz1/Bz8zCwIh87EUtM9Vze DADpxILacbIASbBx5FZNfW6HGEmYrVnOynweeKBYk1Yd0I8v8nqfQQ/58XsDZx94 8Wm00w== Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4f9wwftv1x-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 09 Jul 2026 11:15:59 +0000 (GMT) Received: by mail-qt1-f197.google.com with SMTP id d75a77b69052e-51c0199faafso12259971cf.3 for ; Thu, 09 Jul 2026 04:15:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1783595759; x=1784200559; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=Y/QNMVWz2zbU62zSNYrI+1kG+0GMg+VxTcjcEiOFHtg=; b=kMSp+MCXIXJE0DIs7pFLHYpvXnsnX3iIWZtDgN0i1fJWjnjBoz1NYPDmjbbQCCRNEK vscp+wRWlJNCjh/XanhPMyB6cllBsqrXbJaR+3Yim34KJ+QqVhYiq4XnmxXbcn3+kzYX htjTdXGkRRCxkvb6URsJhgktwib3kHT7eKtJttgS7TcTyMyPpdBJUvP2lYCZTsqMbzT6 53EbRfFizqInCSE9LMw26TK3JlfoQcPT/Fcg6Pw9vXT5ycRhoHqWKtMQJQ6LJMNItBsU p5s3qJHEUsH+n8X9iO9VfJurTdzfT3D39Xrh9IZvupN59Nvf5nehBIKJmRnYljAv7uS5 Bxwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783595759; x=1784200559; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Y/QNMVWz2zbU62zSNYrI+1kG+0GMg+VxTcjcEiOFHtg=; b=Dkjw68SDlFVP3VnGx745RrF7/PGJ71zrOM88xdg2K2qdIJHZFXNqIkp9wswlBi7c8/ +Krjbf+1YoPOmWAULLBwo2cC0drMuMdrVNt6tb4Vz8MWzAf/p30Z460vcKShj/4mWw8/ rU1kM33FCypGnuP7tPl7TxReKJVldCB2cltmpCAIDEQmoB/kXEW+QwMsw5U6M64JNR8+ /hZ3vEm7fdd9ZVckJrlcVwvKzIFrDVuvAuffFbCLV4KfXNnJsfX3qjntVWsYhGnI6gUC 3BKxhaaqALbKvrH/J+ah/nVYGXxjxWTwLau0lYDuoWn1tGIXGkTRZaoYHVkLO+Wy1ZcX 3YGQ== X-Forwarded-Encrypted: i=1; AHgh+RrNDfMQAKzZUMYbsM14kyDcg9O8o6sXDnvhTXFF9XoUAN3iBilPrwhiWQgtwl7UlDckro62g8NlIg==@vger.kernel.org X-Gm-Message-State: AOJu0Yw1lYDb/OhEKzmm68+dNzvGq67AgSiLwhj+/fN9PwQe8/5TT7z8 0n05gmCer9+GStaS8VRskB1pX25W2/B9zTOinDy5i2DlnZLtvywmW5efE0nA/YWW/ggXIlr/kAO mNy2G2xsuTEj/l7lTHAw6zttrdt/GIA6G6ocWBKN2gwUeVIplkWGasmKmoKmdvg== X-Gm-Gg: AfdE7cl4JlO6NAxh5sHZCPPkTDJDNbLo7ogY1qCjTpa1WYbhkYcmxHrMw5+D4YrUbdn CKjwMoHfaN8Xdf1GZPqRGnkuTMKkN/tmvJk+PTNU0ez6Mtpfm735fmzkCwfwwRuH3fLa3FLAWSy VFw7Gcz/cwXpfdzPB8HFMfCNoQjJXJKSNPyI0a/vvk4qokX3kP5lxphM9Mv+omAEV140OkCFR4t lpNOsczt1HCLlaqo4XwtsfIG4QpjswJXS8c7en8cvU4oQOSjCMIpX+BB7Z1hA4v/nUusgZAZN8+ 76xxGgnrmrADaeAygGshR6TpToqG0ZTqxnUa6XAvaQQ4Fpk8nhSKLfrmvy4he1MzFP/tbH3oXu6 m3TJedm5hdFJwjZasE5zR/j8BsP0j1z6AcLdJ2Ly5AwHFChXch4nFIscHY0BKWw== X-Received: by 2002:a05:622a:1113:b0:51c:1b3d:fe62 with SMTP id d75a77b69052e-51c8b2dbe87mr68191801cf.28.1783595759106; Thu, 09 Jul 2026 04:15:59 -0700 (PDT) X-Received: by 2002:a05:622a:1113:b0:51c:1b3d:fe62 with SMTP id d75a77b69052e-51c8b2dbe87mr68191231cf.28.1783595758685; Thu, 09 Jul 2026 04:15:58 -0700 (PDT) Received: from [192.168.69.219] (88-187-86-199.subs.proxad.net. [88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa039b126sm50274140f8f.24.2026.07.09.04.15.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:15:57 -0700 (PDT) Message-ID: Date: Thu, 9 Jul 2026 13:15:55 +0200 Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 04/18] loongarch/syscall: Use syscall_enter_from_user_mode_randomize_stack() Content-Language: en-US To: Thomas Gleixner , LKML Cc: Peter Zijlstra , Huacai Chen , loongarch@lists.linux.dev, Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Sven Schnelle , linux-s390@vger.kernel.org, x86@kernel.org, Mark Rutland , Jinjie Ruan , Andy Lutomirski , Oleg Nesterov , Richard Henderson , Russell King , Catalin Marinas , Guo Ren , Geert Uytterhoeven , Thomas Bogendoerfer , Helge Deller , Yoshinori Sato , Richard Weinberger , Chris Zankel , linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, Arnd Bergmann , Vineet Gupta , Will Deacon , Brian Cain , Michal Simek , Dinh Nguyen , "David S. Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?UTF-8?Q?Michal_Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org References: <20260707181957.433213175@kernel.org> <20260707190253.865955911@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.865955911@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX/WMCcy+Xe7Xp hu8wOJ4r693O9L2x0Fotz6nPVPniiZOKWxHrmxcbmG4hBGBgE+GbcFRaZdxdfXBNXzd38otVmNX /8gqebWshroc6ZFR9zgq+eRpOgj6EWSMK2gv+yVPDwJ3grQQA9KTjyzC9Glg6tzL5D/Ak3Zd3Jg rv1NWsJMzVkmburFK8Ez750gMWPkyOdNRti/1FhFchJB11/3oIvsAKMUCMy3TMi3tQGwJKlUgKg bebI/b8jlSzj5Q5902BnA40dOHbrtWTl7WVnyygww+DAJyCZXFlZTCmjVD1X8hbo21NxUi2LkMB HZFQFlwqeM7VbgiCa9aEIyf7oVm37YSHNBaHvs5n2XRizZrZ6mymRKOJVAvBSJT7cX3O+tc7oHr QvQz1iUH3lhowEHpoGZsLsRASWVX4U4SQLSKmyVLl0haxj/EECtXYPzjRzVS2ypo7SzwYHFCy1f BqQT8C+WRdXN2cmN3jQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX8zUwsRyhZNH+ fMffvpAjcNVFm8YyFFvzfueWMMU5XwlHOqXpBt9zWF8sTw4ZdWlAXhaFB6IF+GeOdwZJfud3oNq Wr8PiuZaHABlvMcYmJkl/jHlIqfbWiM= X-Proofpoint-ORIG-GUID: SHSA0U5N2IdCbOc15gq2CdFS492N-3l_ X-Proofpoint-GUID: SHSA0U5N2IdCbOc15gq2CdFS492N-3l_ X-Authority-Analysis: v=2.4 cv=Krh9H2WN c=1 sm=1 tr=0 ts=6a4f82ef cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=4s3hRJSeHn4rkQlkrse1kQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=DoJJhcVa48uSEvU2-xUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-09_02,2026-07-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 adultscore=0 spamscore=0 suspectscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090108 On 7/7/26 21:06, Thomas Gleixner wrote: > syscall_enter_from_user_mode_randomize_stack() replaces > syscall_enter_from_user_mode() and the subsequent invocation of > add_random_kstack_offset(). > > The advantage is that it applies the stack randomization right after > enter_from_user_mode() and thereby avoids the overhead of get/put_cpu_var() > as that code is invoked with interrupts disabled. > > No functional change. > > Signed-off-by: Thomas Gleixner > Cc: Huacai Chen > Cc: loongarch@lists.linux.dev > --- > arch/loongarch/kernel/syscall.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) Reviewed-by: Philippe Mathieu-Daudé