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

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Date:   Fri, 14 Jun 2019 13:12:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     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 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.