linux-kernel - Re: [PATCH] x86: check range in reserve

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Date:	Tue, 24 Feb 2009 20:41:46 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: check range in reserve_early()


* Yinghai Lu <yinghai@...nel.org> wrote:

> Impact: cleanup
> 
> one 32bit system report:
> 
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
>  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
>  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 000000001c000000 (usable)
>  BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
> DMI 2.0 present.
> last_pfn = 0x1c000 max_arch_pfn = 0x100000
> kernel direct mapping tables up to 1c000000 @ 7000-c000
> ...
> RAMDISK: 1bc69000 - 1bfef4fa
> ...
> 0MB HIGHMEM available.
> 448MB LOWMEM available.
>   mapped low ram: 0 - 1c000000
>   low ram: 00000000 - 1c000000
>   bootmap 00002000 - 00005800
> (9 early reservations) ==> bootmem [0000000000 - 001c000000]
>   #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]
>   #1 [0000001000 - 0000002000]    EX TRAMPOLINE ==> [0000001000 - 0000002000]
>   #2 [0000006000 - 0000007000]       TRAMPOLINE ==> [0000006000 - 0000007000]
>   #3 [0000400000 - 00009ed14c]    TEXT DATA BSS ==> [0000400000 - 00009ed14c]
>   #4 [001bc69000 - 001bfef4fa]          RAMDISK ==> [001bc69000 - 001bfef4fa]
>   #5 [00009ee000 - 00009f2000]    INIT_PG_TABLE ==> [00009ee000 - 00009f2000]
>   #6 [000009f400 - 0000100000]    BIOS reserved ==> [000009f400 - 0000100000]
>   #7 [0000007000 - 0000007000]          PGTABLE
>   #8 [0000002000 - 0000006000]          BOOTMAP ==> [0000002000 - 0000006000]
> 
> got strange blank entry with PGTABLE
> 
> the reason is init_pg_table is big enough, and zero range is called with
> init_memory_mapping/reserve_early()
> 
> so try to check the range in reserve_early()
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/x86/kernel/e820.c |    3 +++
>  1 file changed, 3 insertions(+)

Applied to tip/x86/mm, thanks Yinghai!

	Ingo
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