linux-kernel - Re: [PATCH v8 1/3] x86/boot: Add acpitb.c to parse acpi tables

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Message-ID: <20181016024844.GA12871@localhost.localdomain>
Date:   Tue, 16 Oct 2018 10:48:44 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <linux-efi@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <keescook@...omium.org>, <bhe@...hat.com>, <rjw@...ysocki.net>,
        <lenb@...nel.org>, <ard.biesheuvel@...aro.org>,
        <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH v8 1/3] x86/boot: Add acpitb.c to parse acpi tables

On Thu, Oct 11, 2018 at 12:57:08PM +0200, Borislav Petkov wrote:
>On Wed, Oct 10, 2018 at 04:41:17PM +0800, Chao Fan wrote:
[...]
>> +#ifdef CONFIG_KEXEC
>> +static bool get_acpi_rsdp(acpi_physical_address *rsdp_addr)
>> +{
>> +	char *args = (char *)get_cmd_line_ptr();
>> +	size_t len = strlen((char *)args);
>> +	char *tmp_cmdline, *param, *val;
>> +	unsigned long long addr = 0;
>> +	char *endptr;
>> +
>> +	if (!strstr(args, "acpi_rsdp="))
>> +		return false;
>> +
>> +	tmp_cmdline = malloc(len+1);
>> +	if (!tmp_cmdline)
>> +		error("Failed to allocate space for tmp_cmdline");
>
>Why do you even need to allocate a tmp cmdline?
>
>Ah, I see what you've done - you've copied handle_mem_options() in
>kaslr.c. Well no, not really.
>
>That functionality needs to get extracted into a separate facility. Oh
>look, there's arch/x86/boot/compressed/cmdline.c which is begging to get
>extended.
>
>:-)
>

Hi Boris,

Sorry for disturbing you again, I want to make sure this detail with you.
You mean that I need splite this as a function and put it to
cmdline.c, right?
If my understand is wrong, please let me know.

Thanks,
Chao Fan