linux-kernel - Re: [PATCH 01/25] asm-generic: Change time_t and clock

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Date:	Tue, 13 May 2014 11:30:38 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	James Hogan <james.hogan@...tec.com>
cc:	Ley Foon Tan <lftan@...era.com>, linux-arch@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, lftan.linux@...il.com,
	cltang@...esourcery.com, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 01/25] asm-generic: Change time_t and clock_t to 64 bit

On Tue, 13 May 2014, James Hogan wrote:
> On 13 May 2014 10:02, Ley Foon Tan <lftan@...era.com> wrote:
> > Use 64 bit time_t and clock_t as default. 32 bit users can provide
> > an override to define these as "long" if needed.
> >
> > Signed-off-by: Ley Foon Tan <lftan@...era.com>
> > ---
> >  include/uapi/asm-generic/posix_types.h | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/uapi/asm-generic/posix_types.h b/include/uapi/asm-generic/posix_types.h
> > index fe74fcc..3f0e613 100644
> > --- a/include/uapi/asm-generic/posix_types.h
> > +++ b/include/uapi/asm-generic/posix_types.h
> > @@ -81,12 +81,22 @@ typedef struct {
> >  #endif
> >
> >  /*
> > + * Use 64 bit time_t and clock_t as default. 32 bit users can provide an override to
> > + * define these as "long" if needed.
> > + */
> > +#ifndef __kernel_time_t
> > +typedef long long      __kernel_time_t;
> > +#endif
> > +
> > +#ifndef __kernel_clock_t
> > +typedef long long      __kernel_clock_t;
> > +#endif
> 
> I think having this as the first patch in the series will break
> bisection for existing 32-bit arches. This needs to be done in such a
> way that at no intermediate commit are __kernel_time_t or
> __kernel_clock_t the wrong size for existing arches, e.g. by having a
> first patch which makes the typedefs conditional but leaves them as
> __kernel_long_t, and a final patch that changes the default after all
> the arches have got their overrides in place.

And instead of having a gazillion of pointless include file changes
which all do the same thing, this should simply use a config switch.

Thanks,

	tglx
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