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SubjectRe: [PATCH] x86: check range in reserve_early()

* Yinghai Lu <yinghai@kernel.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@kernel.org>
>
> ---
> arch/x86/kernel/e820.c | 3 +++
> 1 file changed, 3 insertions(+)

Applied to tip/x86/mm, thanks Yinghai!

Ingo


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