linux-kernel - Re: [PATCH 1/2] x86 boot: add E820_RESVD

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Date:	Thu, 26 Jun 2008 02:47:03 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, andi@...stfloor.org,
	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86 boot: add E820_RESVD_KERN

On Thu, Jun 26, 2008 at 12:48 AM, Huang, Ying <ying.huang@...el.com> wrote:
> On Thu, 2008-06-26 at 00:25 -0700, Yinghai Lu wrote:
> [...]
>> >                if (pfn >= limit_pfn)
>> > @@ -977,7 +978,7 @@ u64 __init early_reserve_e820(u64 startt
>> >                return 0;
>> >
>> >        addr = round_down(start + size - sizet, align);
>> > -       e820_update_range(addr, sizet, E820_RAM, E820_RESERVED);
>> > +       e820_update_range(addr, sizet, E820_RAM, E820_RESVD_KERN);
>>
>> this line is not needed.
>
> Why? Memory reserved by early_rserved_e820 should not be saved during
> hibernation? shoudl not be saved by kdump?
>
>> >        printk(KERN_INFO "update e820 for early_reserve_e820\n");
>> >        update_e820();
>> >
>> > @@ -1191,6 +1192,7 @@ void __init e820_reserve_resources(void)
>> >        res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
>> >        for (i = 0; i < e820.nr_map; i++) {
>> >                switch (e820.map[i].type) {
>> > +               case E820_RESVD_KERN:
>> >                case E820_RAM:  res->name = "System RAM"; break;
>> >                case E820_ACPI: res->name = "ACPI Tables"; break;
>> >                case E820_NVS:  res->name = "ACPI Non-volatile Storage"; break;
>> >
>> > --
>>
>> please  move reserve_setup_data() from head.c/head64.c to setup32/64.c
>> or merged setup.c
>
> OK.
>
>> also need to change reserve_early in reserve_setup_data to
>> e820_update_range(,,E820_RAM, E820_RESEVED_EXTRA).
>
> Does this means reserve_early() should be replaced by
> e820_update_range()?

Yes. in your case.

>
>> calling reserve_setup_data() should around early_reserve_e820_mpc_new.
>
> I think reserve_xxx should be called before first find_e820_area() to
> minimize the possibility of conflict.
You already call e820_update_range, that could prevent find_e820_area
to get confused.

YH