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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Sun, 27 Dec 2020 16:59:24 -0800
Message-ID: <CAADnVQ+DStjXJPUbUL7ggXyFj_iJuNDB56jdhzsq=D=QxgQQXg@mail.gmail.com>
Subject: Re: [PATCH] mm: add prototype for __add_to_page_cache_locked()
To:     Christoph Hellwig <hch@infradead.org>
Cc:     Matthew Wilcox <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Souptick Joarder <jrdr.linux@gmail.com>,
        linux-mm <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Alex Shi <alex.shi@linux.alibaba.com>
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On Wed, Dec 23, 2020 at 7:54 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Wed, Dec 23, 2020 at 12:11:36PM +0000, Matthew Wilcox wrote:
> > On Wed, Dec 23, 2020 at 08:31:26AM +0000, Christoph Hellwig wrote:
> > > Can we please make the eBPF code stop referencing this function instead
> > > of papering over this crap?  It has no business poking into page cache
> > > internals.
> >
> > The reference from the BPF code is simply "you can inject errors here".
> > And I think we want to be able to inject errors to test the error paths,
> > no?
>
> Something that expects a symbol to be global is just pretty broken.
> I think it need to change so that whatever instrumentation is done can
> coexist with a static function.

Pls read commit description that made it global.
It has nothing to do with bpf.