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

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Date:   Mon, 22 Oct 2018 14:06:13 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Fan, Chao" <fanc.fnst@...fujitsu.com>, dyoung@...hat.com
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "msys.mizuma@...il.com" <msys.mizuma@...il.com>,
        "Indoh, Takao" <indou.takao@...itsu.com>,
        "Cao, Jin" <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH v9 5/8] x86/boot: Add get_acpi_rsdp() to parse RSDP in
 cmdlien from kexec

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.