linux-kernel - Re: [RFC PATCH 6/9] mm: export-GPL get_pageblock

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Date:   Sun, 12 Apr 2020 01:14:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, akpm@...ux-foundation.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, rostedt@...dmis.org,
        Alexei Starovoitov <ast@...nel.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH 6/9] mm: export-GPL get_pageblock_migratetype

On Thu, Apr 09, 2020 at 03:35:40PM -0400, Mathieu Desnoyers wrote:
> The macro include/linux/mmzone.h:get_pageblock_migratetype() uses
> the symbol get_pfnblock_flags_mask, which is not exported. That macro is
> used within the kmem and page_ref trace events to trace the migrate type
> of the target page.
> 
> Exporting this symbol to GPL modules allows GPL kernel tracers to be
> implemented as modules.

Which might make some sense if we had such intree modules (and then even
some as we could have higher level functions).  Without that is
obviously is a no-go.