linux-kernel - Re: [PATCH v13 19/26] mm: Re-introduce do_mmap

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Date:   Thu, 1 Oct 2020 19:06:48 -0700
From:   Peter Collingbourne <pcc@...gle.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v13 19/26] mm: Re-introduce do_mmap_pgoff()

On Fri, Sep 25, 2020 at 7:57 AM Yu-cheng Yu <yu-cheng.yu@...el.com> wrote:
>
> There was no more caller passing vm_flags to do_mmap(), and vm_flags was
> removed from the function's input by:
>
>     commit 45e55300f114 ("mm: remove unnecessary wrapper function do_mmap_pgoff()").
>
> There is a new user now.  Shadow stack allocation passes VM_SHSTK to
> do_mmap().  Re-introduce the vm_flags and do_mmap_pgoff().

I would prefer to change the callers to pass the additional 0 argument
instead of bringing the wrapper function back, but if we're going to
bring it back then we should fix the naming (both functions take a
pgoff argument, so the previous name do_mmap_pgoff() was just plain
confusing).

Peter