linux-kernel - Re: [PATCH 00/19] Add generic user

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Message-ID: <CALCETrW-hHyh3nF3ATmy61PCy1iFqVhVYX+-ptBCMP5Bf7aJ0w@mail.gmail.com>
Date:   Sun, 8 Nov 2020 11:07:44 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, X86 ML <x86@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        "David S. Miller" <davem@...emloft.net>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH 00/19] Add generic user_landing tracking

On Sat, Nov 7, 2020 at 9:17 PM Dmitry Safonov <dima@...sta.com> 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.

--Andy