linux-kernel - Re: [PATCH v2 07/25] powerpc32: refactor x_mapped_by_bats() and x_mapped_by

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Date:	Tue, 6 Oct 2015 10:16:51 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Christophe Leroy <christophe.leroy@....fr>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 07/25] powerpc32: refactor x_mapped_by_bats() and
 x_mapped_by_tlbcam() together

On Tue, 2015-10-06 at 16:02 +0200, Christophe Leroy wrote:
> Le 29/09/2015 01:47, Scott Wood a écrit :
> > On Tue, Sep 22, 2015 at 06:50:42PM +0200, Christophe Leroy wrote:
> > > x_mapped_by_bats() and x_mapped_by_tlbcam() serve the same kind of
> > > purpose, so lets group them into a single function.
> > > 
> > > Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> > > ---
> > > No change in v2
> > > 
> > >   arch/powerpc/mm/pgtable_32.c | 33 ++++++++++++++++++++++++++-------
> > >   1 file changed, 26 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
> > > index 03a073a..3fd9083 100644
> > > --- a/arch/powerpc/mm/pgtable_32.c
> > > +++ b/arch/powerpc/mm/pgtable_32.c
> > > @@ -67,6 +67,28 @@ extern unsigned long p_mapped_by_tlbcam(phys_addr_t 
> > > pa);
> > >   #define p_mapped_by_tlbcam(x)   (0UL)
> > >   #endif /* HAVE_TLBCAM */
> > >   
> > > +static inline unsigned long p_mapped_by_other(phys_addr_t pa)
> > > +{
> > > + unsigned long v;
> > > +
> > > + v = p_mapped_by_bats(pa);
> > > + if (v /*&& p_mapped_by_bats(p+size-1)*/)
> > > +         return v;
> > > +
> > > + return p_mapped_by_tlbcam(pa);
> > > +}
> > Did you forget to remove that comment?
> > 
> > 
> No I didn't, I though it was there for a reason, it has been there since 
> 2005.
> Do you think I should remove it ?

Oh, you took it from __ioremap_caller.  Commented-out code is generally 
frowned upon, and it makes even less sense now because there's no "size" in 
p_mapped_by_other.

-Scott

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