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([2a02:8084:e84:2480:228:f8ff:fe6f:83a8]) by smtp.gmail.com with ESMTPSA id g17sm11485885wrw.37.2020.11.08.17.27.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Nov 2020 17:27:28 -0800 (PST) Subject: Re: [PATCH 00/19] Add generic user_landing tracking To: Andy Lutomirski , Dmitry Safonov Cc: LKML , Alexander Viro , Andrew Morton , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christophe Leroy , Guo Ren , "H. Peter Anvin" , Ingo Molnar , Oleg Nesterov , Russell King , Thomas Bogendoerfer , Thomas Gleixner , Vincenzo Frascino , Will Deacon , X86 ML , linux-arm-kernel , Albert Ou , "David S. Miller" , Palmer Dabbelt , Paul Walmsley , Linux FS Devel , Christian Borntraeger , Heiko Carstens , Vasily Gorbik , linux-s390 , sparclinux , "open list:MIPS" References: <20201108051730.2042693-1-dima@arista.com> From: Dmitry Safonov <0x7f454c46@gmail.com> Message-ID: <9f416ebd-2535-1b57-7033-e1755e906743@gmail.com> Date: Mon, 9 Nov 2020 01:27:27 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 11/8/20 7:07 PM, Andy Lutomirski wrote: > On Sat, Nov 7, 2020 at 9:17 PM Dmitry Safonov wrote: >> >> Started from discussion [1], where was noted that currently a couple of >> architectures support mremap() for vdso/sigpage, but not munmap(). >> If an application maps something on the ex-place of vdso/sigpage, >> later after processing signal it will land there (good luck!) >> >> Patches set is based on linux-next (next-20201106) and it depends on >> changes in x86/cleanups (those reclaim TIF_IA32/TIF_X32) and also >> on my changes in akpm (fixing several mremap() issues). >> >> Logically, the patches set divides on: >> - patch 1: cleanup for patches in x86/cleanups >> - patches 2-11: cleanups for arch_setup_additional_pages() > > I like these cleanups, although I think you should stop using terms > like "new-born". A task being exec'd is not newborn at all -- it's in > the middle of a transformation. Thank you for looking at them, Andy :-) Yeah, somehow I thought about new-execed process as a new-born binary. I'll try to improve changelogs in v2. Thanks, Dmitry