Re: [PATCH v2 1/2] sysdeps: Add clock_gettime64 vDSO

[Alistair Francis <alistair23@gmail.com>]

On Thu, Nov 21, 2019 at 9:46 AM Adhemerval Zanella
<adhemerval.zanella@linaro.org> wrote:
>
>
>
> On 09/11/2019 23:56, Alistair Francis wrote:
> > Add support for the clock_gettim64 vDSO calls. These are protected by
> > the HAVE_CLOCK_GETTIME64_VSYSCALL define.
> >
> > HAVE_CLOCK_GETTIME64_VSYSCALL should be defined for 32-bit platforms
> > (WORDSIZE == 32) that only run on the 5.1 kernel or later. WORDSIZE ==
> > 64 platforms can use #define __vdso_clock_gettime64 __vdso_clock_gettime
> > and use the __vdso_clock_gettime syscall as they don't have a
> > __vdso_clock_gettime64 call.
> >
> >       * sysdeps/unix/sysv/linux/init-first.c: Add clock_gettime64
> >       vDSO.
> >       * sysdeps/unix/sysv/linux/libc-vdso.h: Likewise.
>
> LGTM, thanks.
>
> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

Thanks! I added your reviewed line to the commit message.

Alistair

>
> > ---
> >  sysdeps/unix/sysv/linux/init-first.c | 10 ++++++++++
> >  sysdeps/unix/sysv/linux/libc-vdso.h  |  4 ++++
> >  2 files changed, 14 insertions(+)
> >
> > diff --git a/sysdeps/unix/sysv/linux/init-first.c b/sysdeps/unix/sysv/linux/init-first.c
> > index d90ca820be0..d005d133220 100644
> > --- a/sysdeps/unix/sysv/linux/init-first.c
> > +++ b/sysdeps/unix/sysv/linux/init-first.c
> > @@ -24,6 +24,11 @@
> >  int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
> >    attribute_hidden;
> >  #endif
> > +/* vDSO symbol used on clock_gettime64 implementation.  */
> > +#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
> > +int (*VDSO_SYMBOL(clock_gettime64)) (clockid_t, struct __timespec64 *)
> > +  attribute_hidden;
> > +#endif
> >  /* vDSO symbol used on clock_getres implementation.  */
> >  #ifdef HAVE_CLOCK_GETRES_VSYSCALL
> >  int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
> > @@ -52,6 +57,11 @@ __libc_vdso_platform_setup (void)
> >      = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME_VSYSCALL);
> >  #endif
> >
> > +#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
> > +  VDSO_SYMBOL(clock_gettime64)
> > +    = get_vdso_mangle_symbol (HAVE_CLOCK_GETTIME64_VSYSCALL);
> > +#endif
> > +
> >  #ifdef HAVE_CLOCK_GETRES_VSYSCALL
> >    VDSO_SYMBOL(clock_getres)
> >      = get_vdso_mangle_symbol (HAVE_CLOCK_GETRES_VSYSCALL);
>
> Ok.
>
> > diff --git a/sysdeps/unix/sysv/linux/libc-vdso.h b/sysdeps/unix/sysv/linux/libc-vdso.h
> > index 792ac39d85a..c6d505bab39 100644
> > --- a/sysdeps/unix/sysv/linux/libc-vdso.h
> > +++ b/sysdeps/unix/sysv/linux/libc-vdso.h
> > @@ -32,6 +32,10 @@
> >  extern int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
> >    attribute_hidden;
> >  #endif
> > +#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
> > +extern int (*VDSO_SYMBOL(clock_gettime64)) (clockid_t, struct __timespec64 *)
> > +  attribute_hidden;
> > +#endif
> >  #ifdef HAVE_CLOCK_GETRES_VSYSCALL
> >  extern int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
> >    attribute_hidden;
> >
>
> Ok.