Re: [PATCH] ACPI: acpi_pad: fix uninitialized variable warning

[Chen Gong <gong.chen@linux.intel.com>]

于 8/4/2010 3:17 AM, Bill Pemberton 写道:
> drivers/acpi/acpi_pad.c:432: warning: 'num_cpus' may be used
> uninitialized in this function
>
> num_cpus is set by the call to acpi_pad_pur()
>
> Signed-off-by: Bill Pemberton<wfp5p@virginia.edu>
> ---
>   drivers/acpi/acpi_pad.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index b76848c..69e2593 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -429,7 +429,7 @@ static void acpi_pad_ost(acpi_handle handle, int stat,
>
>   static void acpi_pad_handle_notify(acpi_handle handle)
>   {
> -	int num_cpus;
> +	int uninitialized_var(num_cpus);
>   	uint32_t idle_cpus;
>
>   	mutex_lock(&isolated_cpus_lock);
It is not necessary because the 1st usage of this variable is as 
left-value, not right-value.
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