linux-kernel - Re: [PATCH 1/2] vdso: allow to add architecture-specific vdso data

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Date:   Mon, 03 Aug 2020 14:13:13 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sven Schnelle <svens@...ux.ibm.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-kernel@...r.kernel.org, Sven Schnelle <svens@...ux.ibm.com>
Subject: Re: [PATCH 1/2] vdso: allow to add architecture-specific vdso data

Sven,

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

just a few nits.

Can you please spare that #ifdef and do:

#ifdef CONFIG_ARCH_HAS_VDSO_DATA
#include <asm/vdso/data.h>
#else
struct arch_vdso_data {};
#endif

Please keep the tabular alignment of the struct members and add kernel
doc in the comment above the struct.

Aside of that 'arch' is not really a intuitive name. 'arch_data' or
something like that. Hmm?

Thanks,

        tglx