linux-kernel - Re: [PATCH v4] mm: fix is_pinnable

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Message-ID: <0accce46-fac6-cdfb-db7f-d08396bf9d35@nvidia.com>
Date:   Wed, 11 May 2022 18:08:02 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Minchan Kim <minchan@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Dias <joaodias@...gle.com>,
        "David Hildenbrand" <david@...hat.com>
Subject: Re: [PATCH v4] mm: fix is_pinnable_page against on cma page

On 5/11/22 18:03, Minchan Kim wrote:
>>
>> Or there might be some code path that really hates a READ_ONCE() in
>> that place.
> 
> My worry about chaning __get_pfnblock_flags_mask is it's called
> multiple hot places in mm codes so I didn't want to add overhead
> to them.

...unless it really does generate the same code as is already there,
right? Let me check that real quick.

thanks,
-- 
John Hubbard
NVIDIA