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List:       linux-kernel
Subject:    Re: [PATCH] x86: Make e820_remove_range to handle all covered case
From:       Rusty Russell <rusty () rustcorp ! com ! au>
Date:       2010-03-31 23:28:47
Message-ID: 201004010946.47934.rusty () rustcorp ! com ! au
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On Tue, 30 Mar 2010 04:08:29 pm Yinghai Lu wrote:
> 
> Rusty found on lguest with trim_bios_range, max_pfn is not right anymore, and
> looks e820_remove_range does not work right.
> 
> [    0.000000] BIOS-provided physical RAM map:
> [    0.000000]  LGUEST: 0000000000000000 - 0000000004000000 (usable)
> [    0.000000] Notice: NX (Execute Disable) protection missing in CPU or disabled in BIOS!
> [    0.000000] DMI not present or invalid.
> [    0.000000] last_pfn = 0x3fa0 max_arch_pfn = 0x100000
> [    0.000000] init_memory_mapping: 0000000000000000-0000000003fa0000
> 
> root cause is: the e820_remove_range doesn't handle that all cover case.
> e820_remove_range(BIOS_START, BIOS_END - BIOS_start, ,,)
> get miss one left range.
> 
> Make that is corresponding to e820_update_range() to handle that case too.

Tested-by: Rusty Russell <rusty@rustcorp.com.au>

Please put in -urgent...

Thanks,
Rusty.
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