linux-kernel - Re: [PATCH v2] drivers:platform/x86:Use ARRAY_SIZE() for the size calculation of the array.

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Date:   Wed, 13 Sep 2017 12:02:11 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Allen Pais <allen.lkml@...il.com>
Cc:     linux-kernel@...r.kernel.org, souvik.k.chakravarty@...el.com,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2] drivers:platform/x86:Use ARRAY_SIZE() for the size calculation of the array.

Allen Pais <allen.lkml@...il.com> writes:

> Signed-off-by: Allen Pais <allen.lkml@...il.com>
> ---
>  drivers/platform/x86/intel_telemetry_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c b/drivers/platform/x86/intel_telemetry_debugfs.c
> index d4fc42b..6b63b3d 100644
> --- a/drivers/platform/x86/intel_telemetry_debugfs.c
> +++ b/drivers/platform/x86/intel_telemetry_debugfs.c
> @@ -76,7 +76,7 @@
>  #define TELEM_IOSS_DX_D0IX_EVTS		25
>  #define TELEM_IOSS_PG_EVTS		30
>  
> -#define TELEM_EVT_LEN(x) (sizeof(x)/sizeof((x)[0]))
> +#define TELEM_EVT_LEN(x) ARRAY_SIZE(x)
>  
>  #define TELEM_DEBUGFS_CPU(model, data) \
>  	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&data}

What's the point?  Why not simply replace all instances of TELEM_EVT_LEN
with ARRAY_SIZE?



Bjørn