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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47a9de1d8cdsm54261424f8f.1.2026.07.09.04.16.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:16:24 -0700 (PDT) Message-ID: Date: Thu, 9 Jul 2026 13:16:21 +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 05/18] powerpc/syscall: Use syscall_enter_from_user_mode_randomize_stack() Content-Language: en-US To: Thomas Gleixner , LKML Cc: Peter Zijlstra , 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, 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> <20260707190253.918861529@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.918861529@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfXyI6Smnony1+x +w8m6bz4gDj8f4PgjWJiFOAGs4iDNpgS86E3OQ3ufsSCwlARRuVPWML/50b771XqiagyYgHHazG Ipy9tfiNPXlqFHcyTvSeSJLZIWTCi74= X-Proofpoint-GUID: tg7Rn9DiPHZH0A23HDFk18briuvgwg3v X-Proofpoint-ORIG-GUID: tg7Rn9DiPHZH0A23HDFk18briuvgwg3v X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX95InDdlMn3+l vOpqYOnySafKnJy0OefTB56xV+n7M4Z6KRlBX6snuyUDVgFgHgbPmWPmxXUgfAnZSSPVCjqtUzV m5uaaXSrlhQ27ZS2x8D6QE4rN56RqvFt6/g6dTgmwBxO0Af1fojbwHF8qwLmkZjPx/bfsMXyUDg LdyPLu3Vn6YLbRNkKMHk6+ckz0PcbNl0C4Ltft4h0nKMNCSEOn0t/+6ssBIyVN6iW7E6WUlA63a dj4ealudq95iPbVDgAb38oKldj/UX3OQhdhjj8xQQEZOezp8M3758BNiKFX3hptaCLvs4O9emlr MafKMwU0HAerIcoLK+6UXoXuYmVWXQV3kcmSBj2bFv9PXRC11sTHp94rmav2pAJQltgOEGKwzqr Ks1p2MXOqg/jVxoffw/8bFyS8etEAhUwCQszKefvjDGV6jmd3lf2hjpiqN2+KmaVPil4jeKpI5g 8VSt+hHG95mUP3RUDFA== X-Authority-Analysis: v=2.4 cv=H43rBeYi c=1 sm=1 tr=0 ts=6a4f830a cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==: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=ZpdpYltYx_vBUK5n70dp:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=voM4FWlXAAAA:8 a=EUspDBNiAAAA:8 a=DoJJhcVa48uSEvU2-xUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 a=IC2XNlieTeVoXbcui8wp: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=1011 impostorscore=0 adultscore=0 spamscore=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 suspectscore=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: Michael Ellerman > Cc: Shrikanth Hegde > Cc: linuxppc-dev@lists.ozlabs.org > --- > arch/powerpc/kernel/syscall.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) Reviewed-by: Philippe Mathieu-Daudé