Re: [PATCH v9 5/8] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec

[Baoquan He]

On 10/22/18 at 05:30am, Fan, Chao wrote:
> >> +static void get_acpi_rsdp(acpi_physical_address *rsdp_addr)
> >> +{
> >> +#ifdef CONFIG_KEXEC
> >> +	unsigned long long res;
> >> +	int len = 0;
> >> +	char *val;
> >> +
> >> +	val = malloc(20);
> >
> >Why is the length 20? Defined a macro?
> >
> 
> Not a calculation, if it's enough to store the address, that will be OK.

Sorry, I didn't catch. It's 16 in setup_acpi_rsdp() of
drivers/acpi/osl.c . What does 'that' mean?

Wondering why not making it 200, it's also enough to store the address.