linux-kernel - Re: [PATCH] x86: e820: Implement a range manipulation operator

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Date:   Sat, 3 Feb 2018 00:06:26 +0100
From:   "Jan H. Schönherr" <jschoenh@...zon.de>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: e820: Implement a range manipulation operator

On 02/02/2018 09:50 PM, Andy Shevchenko wrote:
> On Fri, Feb 2, 2018 at 1:13 AM, Jan H. Schönherr <jschoenh@...zon.de> wrote:
> 
>> +                       [KNL,ACPI] Convert memory within the specified region
>> +                       from <oldtype> to <newtype>. If "-<oldtype>" is left
>> +                       out, the whole region will be marked as <newtype>,
>> +                       even if previously unavailable. If "+<newtype>" is left
>> +                       out, matching memory will be removed. Types are
>> +                       specified as e820 types, eg, 1==RAM, 2==reserved,
>> +                       3==ACPI, 12==PRAM.
> 
> s/==/ = /g

Sure. I've also properly abbreviated that "e.g.".

>> +       } else if (*p == '%') {
>> +               enum e820_type from = 0, to = 0;
>> +
>> +               start_at = memparse(p + 1, &p);
>> +               if (*p == '-')
>> +                       from = simple_strtoull(p + 1, &p, 0);
>> +               if (*p == '+')
>> +                       to = simple_strtoull(p + 1, &p, 0);
>> +               if (*p != 0)
> 
> if (*p)
> 
> or
> 
> if (*p != '\0')
> 
> ?

Something similar to the latter is used in the function already. The latter it is.

Regards
Jan