linux-kernel - Re: [PATCH 1/3] vdso: allow to add architecture-specific vdso data

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Message-ID: <yt9dk0yed45x.fsf@linux.ibm.com>
Date:   Tue, 04 Aug 2020 13:46:50 +0200
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        hca@...ux.ibm.com
Subject: Re: [PATCH 1/3] vdso: allow to add architecture-specific vdso data

Hi,

Sven Schnelle <svens@...ux.ibm.com> writes:

> Add the possibility to add architecture specific vDSO
> data to struct vdso_data. This is useful if the arch specific
> user space VDSO code needs additional data during execution.
> If CONFIG_ARCH_HAS_VDSO_DATA is defined, the generic code will
> include asm/vdso/data.h which should contain 'struct arch_vdso_data'.
> This structure will be embedded in the generic vDSO data.
>
> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> ---
>  arch/Kconfig            | 3 +++
>  include/vdso/datapage.h | 7 +++++++
>  2 files changed, 10 insertions(+)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 8cc35dc556c7..e1017ce979e2 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -979,6 +979,9 @@ config HAVE_SPARSE_SYSCALL_NR
>  	  entries at 4000, 5000 and 6000 locations. This option turns on syscall
>  	  related optimizations for a given architecture.
>  
> +config ARCH_HAS_VDSO_DATA
> +	bool
> +
>  source "kernel/gcov/Kconfig"
>  
>  source "scripts/gcc-plugins/Kconfig"
> diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
> index 7955c56d6b3c..74e730238ce6 100644
> --- a/include/vdso/datapage.h
> +++ b/include/vdso/datapage.h
> @@ -19,6 +19,10 @@
>  #include <vdso/time32.h>
>  #include <vdso/time64.h>
>  
> +#ifdef CONFIG_ARCH_HAS_VDSO_DATA
> +#include <asm/vdso/data.h>
> +#endif
> +
>  #define VDSO_BASES	(CLOCK_TAI + 1)
>  #define VDSO_HRES	(BIT(CLOCK_REALTIME)		| \
>  			 BIT(CLOCK_MONOTONIC)		| \
> @@ -97,6 +101,9 @@ struct vdso_data {
>  	s32			tz_dsttime;
>  	u32			hrtimer_res;
>  	u32			__unused;
> +#ifdef CONFIG_ARCH_HAS_VDSO_DATA
> +	struct arch_vdso_data arch;
> +#endif
>  };
>  
>  /*

I've sent the wrong version of this patch. I'll send a revised version
with the requested changes later.