Re: [PATCH] arch64: export __flush_dcache_area

[Mark Salyzyn]

On 05/17/2019 02:53 PM, Catalin Marinas wrote:
> On Fri, May 17, 2019 at 12:59:56PM -0700, Mark Salyzyn wrote:
> > Some (out of tree modular) drivers feel a need to ensure
> > data is flushed to the DDR before continuing flow.
> >
> > Signed-off-by: Mark Salyzyn <salyzyn@xxxxxxxxxxx>
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > Cc: kernel-team@xxxxxxxxxxx
> > ---
> >   arch/arm64/mm/cache.S | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
> > index a194fd0e837f..70d7cb5c0bd2 100644
> > --- a/arch/arm64/mm/cache.S
> > +++ b/arch/arm64/mm/cache.S
> > @@ -120,6 +120,7 @@ ENTRY(__flush_dcache_area)
> >   	dcache_by_line_op civac, sy, x0, x1, x2, x3
> >   	ret
> >   ENDPIPROC(__flush_dcache_area)
> > +EXPORT_SYMBOL_GPL(__flush_dcache_area)
> >   
> >   /*
> >    *	__clean_dcache_area_pou(kaddr, size)
> NAK. Such drivers are doing something wrong, there is a dedicated
> in-kernel API for that handles kernel maintenance (hint: DMA).
Thanks!

-- Mark