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SubjectRe: [PATCH 1/8] Use __kernel_long_t in struct timex
On Fri, Dec 27, 2013 at 05:25:05PM +0000, H.J. Lu wrote:
> X32 adjtimex system call is the same as x86-64 adjtimex system call,
> which uses 64-bit integer for long in struct timex. But x32 long is
> 32 bit. This patch replaces long in struct timex with __kernel_long_t
> if __BITS_PER_LONG == 64.
>
> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
> ---
> include/uapi/linux/timex.h | 46 ++++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 38 insertions(+), 8 deletions(-)
>
> diff --git a/include/uapi/linux/timex.h b/include/uapi/linux/timex.h
> index a7ea81f..98314e9 100644
> --- a/include/uapi/linux/timex.h
> +++ b/include/uapi/linux/timex.h
> @@ -63,28 +63,58 @@
> */
> struct timex {
> unsigned int modes; /* mode selector */
> +#if __BITS_PER_LONG == 64
> + __kernel_long_t offset; /* time offset (usec) */
> + __kernel_long_t freq; /* frequency offset (scaled ppm) */
> + __kernel_long_t maxerror;/* maximum error (usec) */
> + __kernel_long_t esterror;/* estimated error (usec) */
> +#else
> long offset; /* time offset (usec) */
> long freq; /* frequency offset (scaled ppm) */
> long maxerror; /* maximum error (usec) */
> long esterror; /* estimated error (usec) */
> +#endif

These changes should work on arm64 ILP32 as well.

> int status; /* clock command/status */
> +#if __BITS_PER_LONG == 64
> + __kernel_long_t constant;/* pll time constant */
> + __kernel_long_t precision;/* clock precision (usec) (read only) */
> + __kernel_long_t tolerance;/* clock frequency tolerance (ppm)
> + * (read only)
> + */
> +#else
> long constant; /* pll time constant */
> long precision; /* clock precision (usec) (read only) */
> long tolerance; /* clock frequency tolerance (ppm)
> * (read only)
> */
> +#endif
> struct timeval time; /* (read only, except for ADJ_SETOFFSET) */

struct timeval is already defined in terms of __kernel_long_t, so no
issues here either.

BTW, could we not avoid the #if and always use __kernel_long_t? This
wouldn't break the user ABI.

--
Catalin


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