linux-kernel - Re: [PATCH, RFC 20/62] mm/page_ext: Export lookup_page

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Message-ID: <20190617093054.GB3419@hirez.programming.kicks-ass.net>
Date:   Mon, 17 Jun 2019 11:30:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...capital.net>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alison Schofield <alison.schofield@...el.com>,
        linux-mm@...ck.org, kvm@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RFC 20/62] mm/page_ext: Export lookup_page_ext() symbol

On Sat, Jun 15, 2019 at 01:44:43AM +0300, Kirill A. Shutemov wrote:
> On Fri, Jun 14, 2019 at 01:12:59PM +0200, Peter Zijlstra wrote:
> > On Wed, May 08, 2019 at 05:43:40PM +0300, Kirill A. Shutemov wrote:
> > > page_keyid() is inline funcation that uses lookup_page_ext(). KVM is
> > > going to use page_keyid() and since KVM can be built as a module
> > > lookup_page_ext() has to be exported.
> > 
> > I _really_ hate having to export world+dog for KVM. This one might not
> > be a real issue, but I itch every time I see an export for KVM these
> > days.
> 
> Is there any better way? Do we need to invent EXPORT_SYMBOL_KVM()? :P

Or disallow KVM (or parts thereof) from being a module anymore.