linux-kernel - Re: [PATCH] mm/page_table_check: Drop all redundant EXPORT

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Date:   Wed, 20 Apr 2022 23:32:30 -0400
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/page_table_check: Drop all redundant EXPORT_SYMBOL()

On Wed, Apr 20, 2022 at 11:23 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, Apr 20, 2022 at 12:54:08PM -0400, Pasha Tatashin wrote:
> > The rest of EXPORTs were added to be symmetric, and allow other
> > drivers to use set_*p**()/clear_p** calls.
>
> EXPORT_SYMBOLs actually have a real cost.  We don't add them "for
> symmetry".

Sure, the rest of exports can be removed, but:

> -EXPORT_SYMBOL(__page_table_check_pte_set);

must stay because of

ERROR: modpost: "__page_table_check_pte_set"
[drivers/gpu/drm/i915/i915.ko] undefined!

Pasha