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

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Date:   Thu, 21 Apr 2022 09:17:50 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     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 4/21/22 09:02, Pasha Tatashin wrote:
> 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!

Sure, will resend.