From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 E859E3F9F22 for ; Thu, 9 Jul 2026 11:17:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595845; cv=none; b=o2bk80p4Xzuxk6HjxopyvCg6ytF/udDVyyCUjERLm0+stsbyvKEV6UQoAWNsiXmUjjBcPVhsH7eaLOoBjJIsDnO9ZUGFpp2SKKuIixDdm3ktJyG1mklGBFkNKopYSFZuxsU2QfXU1EbtssaRvf3Yqkcug3PXdFcRGhsW+qvJoUs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595845; c=relaxed/simple; bh=nrb0ag4EBTliR8HEhFNdNbVVIK/JUBRD2JKlM2G1ar0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IUAcz6eXza/na8ItjxTmj1haE4k89Zii3wH+H1Qljt7mmwcM5bI+MDntu8SpeBzGBcF74nrWQ0SPIpkjE3Yt45ivJZik9ayVlhzHfNwmWKGKlc/qOqtzdaL1DTQd/8S0Wx2jH2v6dXGP1lwX02vpvr6NeFWST8xNSib5TBTpL1s= 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=L5+SzP63; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=gtO1PuCP; arc=none smtp.client-ip=205.220.168.131 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="L5+SzP63"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="gtO1PuCP" Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669AxFHe1396607 for ; Thu, 9 Jul 2026 11:17:22 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= 6mSNoqY3wyokI6LMIu3gKte85FSyTicRshSy0RusydY=; b=L5+SzP63bgPAWhp4 W0cUVg2l9n9I+4k0Akz43rpejx4oS0/IbbWAmLMXE7C9F37E36sY/GsXk3zuJt0e 7WRl8xWn74pDgWLAKB7VqpUweKGfDHpjZadrDE/thxVaWuDjHJ729famrINqKMDx 0upb87A5cv2e3e9cOgTo/VDABpH4Tf/6q96s0WSa2IFCTqdWIxx3GVEJhdklhdir gMzNGoVv54cFMR8lTrj5sNzMMQDcUrBjV8bPTBpznG6YMJOrkgy1v18t2RPVEfx/ 2v3dDdCotvg9oshrPidheW6ip0HZ0YECDQHkCxRsQPUi1HLjdw3FRE6oVFrVR41W qvGWIw== 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 4fa55vhjmx-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 09 Jul 2026 11:17:22 +0000 (GMT) Received: by mail-qt1-f197.google.com with SMTP id d75a77b69052e-51c19493ac2so11529761cf.1 for ; Thu, 09 Jul 2026 04:17:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1783595841; x=1784200641; 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=6mSNoqY3wyokI6LMIu3gKte85FSyTicRshSy0RusydY=; b=gtO1PuCPVSA3pcxofYSwzSptyCP8fplhGA0gMAQmi2dxDkJtaOaut5/NCmYMcZ66yp ANnNK9rb7kxDIPXzoyfVDt947Ta0of89XonsQf2ieDZ9TcHUuSK7ZKUfimsVYxjXJTJO kU43zaFkytMyc1foFpfmHGxGayaY8QZw1+eaUTZKTy4oMk9XSsJBa32zlN6H29CVuyNA rSSfYeAf1jGHIDl5pyypQVfyjMATyRCcOiIdur5rcViEEVLFcOtNuI1/WYo9Ufcvo0Rn vPZTO8rXfaXRIYTdSlFwq71J1495hyT9KjxVzsTQBjzpTY1aK9RZGnpINh1izwamCSLB k9nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783595841; x=1784200641; 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=6mSNoqY3wyokI6LMIu3gKte85FSyTicRshSy0RusydY=; b=kNbdEdQ5YSkAjTap0jx2c5fjFm4BRvSkvHrh0yVOMyFfEd5Q8LuEiZk41hBPN2rF/t 4CVB2YooG7A6Us/i+8qCh6ME1KqBMxs4P2Q9EhWgOysrkrSp4JbNOFrP0O/mU1yEVi2c VnzG1V1hmEf6/a3ZsWs2n2zwgd0kXhZ7k3BxNf3wKkVY0JqJEuofyuSFyW/XX7L7C0gz rLUJvu3h/QEdqm0STl0B49esPFfgTU8FfvSJhxHJ0cRh18lh8O8Lag23F/AU5lzxjeyn 0IWy5uKrFC0wuAWfBItXwbN4D8p2NShmZwIbvOTC5H6crPTmEL1ZufcmB74q4Nq1WMFS qqEQ== X-Forwarded-Encrypted: i=1; AHgh+RomfGlqE7y91lzklWoDWo0NCTXA4kN+NjvkJI4x+VR+h/m51+3Pphh+ODFV/aOrDJpPW306zn73LxM=@vger.kernel.org X-Gm-Message-State: AOJu0Yw7lMStvZgDqfQ7KmDLiCCFM2bNLVt+IyxWAchq1fHnLHjMweNK JS58SxKGks1w/MNqVVN2S9SOAUETzhvqqMsqkYgo694lAOcJ9qhxPZjZlaxLJl6wFds2IDN9+JT WyRjd1Dc0jlOLG7FGK+LwbN95uqTBrweRnSPj7v1gwKG9xF8B5hUZgrL/zkhZ2Mc= X-Gm-Gg: AfdE7cnGam81n7RgP/Mm0jwcyALWdw92YCK3X8G9SRnZA7mLihZH3ZQKNol4YKuRuLh gdxPlJvRo1ZW+JvCP2kf8zTwaTyRQbInp4V/ddOeLIPWx7zL8/a1MMmoJ8rwHUFr4M5Hf6Tfcu/ VEkhcEYBgJFYcNoYwMFJHZmiuZo+OZ7BEdH2H4GOTY0xoT2WTAAtmGKFYJPu32liMQ+LMCjQFk9 9y66e7EP4+5AMtea69OR6ZAlhMxai9WJlTGf/G/aV7fBvpiQiIk307gkcWFb+9gDxzfPanFoHgJ yms0yuJj4wbIGc7jnOGiVW+dsSVjW7GiKmVlcf8QLPjHgH/D+P4BVrHwTQwvf+f/Xcw0tjiaP3a pH75IFw45ez2RYroAuvMRHLV8WXXJ1qMKZZRscGVUovrrweV6fuIUvHcB1D6XzQ== X-Received: by 2002:a05:622a:c86:b0:51c:7b11:41b2 with SMTP id d75a77b69052e-51c8b51c97cmr72541831cf.78.1783595841171; Thu, 09 Jul 2026 04:17:21 -0700 (PDT) X-Received: by 2002:a05:622a:c86:b0:51c:7b11:41b2 with SMTP id d75a77b69052e-51c8b51c97cmr72541381cf.78.1783595840774; Thu, 09 Jul 2026 04:17:20 -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 5b1f17b1804b1-493eb6cccfdsm54034235e9.1.2026.07.09.04.17.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:17:20 -0700 (PDT) Message-ID: <8d15c107-30b1-48df-9e69-a7e8520f4e36@oss.qualcomm.com> Date: Thu, 9 Jul 2026 13:17:17 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 07/18] s390/syscall: Use enter_from_user_mode_randomize_stack() Content-Language: en-US To: Jinjie Ruan , Thomas Gleixner , LKML Cc: Peter Zijlstra , Sven Schnelle , linux-s390@vger.kernel.org, Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, x86@kernel.org, Mark Rutland , 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> <20260707190254.030598804@kernel.org> <499eca86-8def-4044-8b69-8f290528e10f@huawei.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <499eca86-8def-4044-8b69-8f290528e10f@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX2J9Zhy5yxmqL Ls55zAmo+Ae4MwsKIl6+4vQ4Z1vB6lNtyOl0rZECl1p9wSToKmf6e2yUfkR692Y6TpEkGqm/6Is Ih9U+I16/MHKdh2oP4Z0fNdDfZYSAC1Y8OH7EXICD+KFjv/kfcxswyKjHcj04pdvO16P29hYoPD C4NA55I8ucfPpQtrfQqG236A1pd7d0u64A9ydOauNI9vKTFnnqz6/vmnE79YtPBsgf74EAqVN04 nY+9KpGWEQrQpfF9RogI/6lp744k92R0SgjxzPFqBdmZ9Aijf9oWqcYjnZHlqlOP4IRE6Jb7qVu ijRfJct90hUri5JIpx4dVEWGZ9n0e4tqRq5QhFR/NRc06Q0utXYS0zRGlLGTwhJ+u4h2kDrEVxf AUXSwCgjdVz/BmpjLlhdQCvmzRCHT40kuVr+l5dsPzbrii9PBs2qE3+j3KyMeIFs4J+ShTEHLL1 vfv27p2OYt+aK6ylWMQ== X-Authority-Analysis: v=2.4 cv=KfDidwYD c=1 sm=1 tr=0 ts=6a4f8342 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=DJpcGTmdVt4CTyJn9g5Z:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=EUspDBNiAAAA:8 a=LfsA7Cq2GQzuzbZ-N0YA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfXyA18G4/leS69 6SDJMPboIPhNDVeNg+2OpOEaoD4p3TTDsiQx0AR8F8GCrKyCTE2Rx7aT1l69UJglpGnEplyYH2/ rtefUasrFRjPJsWHcBN5l7BtnAqkHQs= X-Proofpoint-ORIG-GUID: UBdATNxMZ1OjDgyyD3OdialRcYHkcx7A X-Proofpoint-GUID: UBdATNxMZ1OjDgyyD3OdialRcYHkcx7A 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 suspectscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 adultscore=0 clxscore=1011 priorityscore=1501 spamscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090108 On 9/7/26 04:46, Jinjie Ruan wrote: > > > On 7/8/2026 3:06 AM, Thomas Gleixner wrote: >> enter_from_user_mode_randomize_stack() replaces enter_from_user_mode() and >> the subsequent invocation of add_random_kstack_offset_irqsoff(). >> >> As a bonus this avoids the overhead of get/put_cpu_var() in >> add_random_kstack_offset(). >> >> No functional change. >> >> Signed-off-by: Thomas Gleixner >> Cc: Sven Schnelle >> Cc: linux-s390@vger.kernel.org >> --- >> arch/s390/kernel/syscall.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> --- a/arch/s390/kernel/syscall.c >> +++ b/arch/s390/kernel/syscall.c >> @@ -97,8 +97,8 @@ void noinstr __do_syscall(struct pt_regs >> { >> unsigned long nr; >> >> - enter_from_user_mode(regs); >> - add_random_kstack_offset(); >> + enter_from_user_mode_randomize_stack(regs); > > The #include can be removed. Reviewed-by: Philippe Mathieu-Daudé