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Date: Sat, 17 Aug 2013 12:07:54 +0200
From: Laszlo Ersek <lersek@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v4 1/6] pc: Don't prematurely explode
	QEMUMachineInitArgs
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To: armbru@redhat.com
Cc: aliguori@us.ibm.com, mjt@tls.msk.ru, qemu-devel@nongnu.org, agraf@suse.de, blauwirbel@gmail.com, qemu-ppc@nongnu.org, aviksil@linux.vnet.ibm.com

On 08/16/13 13:13, armbru@redhat.com wrote:

>  static void pc_init_isa(QEMUMachineInitArgs *args)
>  {
> -    ram_addr_t ram_size = args->ram_size;
> -    const char *cpu_model = args->cpu_model;
> -    const char *kernel_filename = args->kernel_filename;
> -    const char *kernel_cmdline = args->kernel_cmdline;
> -    const char *initrd_filename = args->initrd_filename;
> -    const char *boot_device = args->boot_device;
>      has_pci_info = false;
> -    if (cpu_model == NULL)
> -        cpu_model = "486";
> +    if (!args->cpu_model) {
> +        args->cpu_model = "486";
> +    }

This modifies *args.

IIUC, args here points to the "args" auto variable in main().
"args.cpu_model" is initialized from the standalone "cpu_model"
variable. That one in turn is either NULL, or points to a command line
argument. Ie. "args.cpu_model" is never expected to be freed, and the
underlying char array is not expected to be modified. OK.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>