Re: [PATCH] crypto/async_pq: use __free_page() instead of put_page()

From: Dan Williams
Date: Mon Feb 29 2016 - 13:04:45 EST

On Mon, Feb 29, 2016 at 1:33 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> The addition of tracepoints to the page reference tracking had an
> unfortunate side-effect in at least one driver that calls put_page
> from its exit function, resulting in a link error:
> `.exit.text' referenced in section `__jump_table' of crypto/built-in.o: defined in discarded section `.exit.text' of crypto/built-in.o
> From a cursory look at that this driver, it seems that it may be
> doing the wrong thing here anyway, as the page gets allocated
> using 'alloc_page()', and should be freed using '__free_page()'
> rather than 'put_page()'.
> With this patch, I no longer get any other build errors from the
> page_ref patch, so hopefully we can assume that it's always wrong
> to call any of those functions from __exit code, and that no other
> driver does it.
> Fixes: 0f80830dd044 ("mm/page_ref: add tracepoint to track down page reference manipulation")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Acked-by: Dan Williams <dan.j.williams@xxxxxxxxx>

Vinod, will you take this one?