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

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Date:	Tue, 13 May 2014 10:15:47 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	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

Hi,

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.

Cheers
James

> +
> +/*
>   * anything below here should be completely generic
>   */
>  typedef __kernel_long_t        __kernel_off_t;
>  typedef long long      __kernel_loff_t;
> -typedef __kernel_long_t        __kernel_time_t;
> -typedef __kernel_long_t        __kernel_clock_t;
>  typedef int            __kernel_timer_t;
>  typedef int            __kernel_clockid_t;
>  typedef char *         __kernel_caddr_t;
> --
> 1.8.2.1
>
> --
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