Re: [Xen-devel] [PATCH v4 4/7] asm/atomic.h: common prototyping (add xen/atomic.h)

[Julien Grall <julien.grall@xxxxxxx>]

On 15/07/16 07:50, Corneliu ZUZU wrote:
> Create a common-side <xen/atomic.h> to establish, among others, prototypes of
> atomic functions called from common-code. Done to avoid introducing
> inconsistencies between arch-side <asm/atomic.h> headers when we make subtle
> changes to one of them. Some arm-side macros had to be turned into inline
> functions in the process (also updated README.LinuxPrimitives file).
>
> Removed outdated comment ("NB. I've [...]").
>
> Signed-off-by: Corneliu ZUZU <czuzu@xxxxxxxxxxxxxxx>
> Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> ---
> Changed since v3:
>    * update README.LinuxPrimitives file
> ---
>   xen/arch/arm/README.LinuxPrimitives |  14 +--
>   xen/include/asm-arm/atomic.h        |  45 ++++++----
>   xen/include/asm-x86/atomic.h        | 103 +---------------------
>   xen/include/xen/atomic.h            | 171 ++++++++++++++++++++++++++++++++++++
>   4 files changed, 210 insertions(+), 123 deletions(-)
>   create mode 100644 xen/include/xen/atomic.h
>
> diff --git a/xen/arch/arm/README.LinuxPrimitives 
> b/xen/arch/arm/README.LinuxPrimitives
> index 4906593..2fcdfa4 100644
> --- a/xen/arch/arm/README.LinuxPrimitives
> +++ b/xen/arch/arm/README.LinuxPrimitives
> @@ -27,10 +27,11 @@ The following functions were taken from Linux:
>       atomic_add(), atomic_add_return(), atomic_sub(), atomic_sub_return(),
>       atomic_cmpxchg(), __atomic_add_unless()
>
> -Also, the following macros which were in the meantime moved to 
> asm-arm/atomic.h:
> -    atomic_xchg(v, new), atomic_inc(v), atomic_dec(v),
> +Also, the following macros which were in the meantime moved to asm-arm/atomic.h
> +and most of them turned to inline functions:
> +    atomic_xchg(v, new) [still macro], atomic_inc(v), atomic_dec(v),
>       atomic_inc_and_test(v), atomic_dec_and_test(v),
> -    atomic_inc_return(v), atomic_dec_return(v),
> +    atomic_inc_return(v) [still macro], atomic_dec_return(v) [still macro],
>       atomic_sub_and_test(i, v), atomic_add_negative(i,v)
As mentioned in patch #1, those functions are not easily sync-able after 
this patch. Please drop them from README.LinuxPrimitives.
>   ---------------------------------------------------------------------
> @@ -105,10 +106,11 @@ The following functions were taken from Linux:
>       atomic_add(), atomic_add_return(), atomic_sub(), atomic_sub_return(),
>       atomic_cmpxchg(), __atomic_add_unless()
>
> -Also, the following macros which were in the meantime moved to 
> asm-arm/atomic.h:
> -    atomic_xchg(v, new), atomic_inc(v), atomic_dec(v),
> +Also, the following macros which were in the meantime moved to asm-arm/atomic.h
> +and most of them turned to inline functions:
> +    atomic_xchg(v, new) [still macro], atomic_inc(v), atomic_dec(v),
>       atomic_inc_and_test(v), atomic_dec_and_test(v),
> -    atomic_inc_return(v), atomic_dec_return(v),
> +    atomic_inc_return(v) [still macro], atomic_dec_return(v) [still macro],
>       atomic_sub_and_test(i, v), atomic_add_negative(i,v)
Ditto.


With that:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

Regards,

--
Julien Grall

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