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[PATCH] x86_64: Don't try to put kernel page tables beyond ZONE_DMA32. 

For not fully explained reasons it broke mem=... on several setups.

Also minor cleanup.

Cc: axboe@suse.de

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-01-16 01:56:51 +01:00 committed by Linus Torvalds
parent 142a64a650
commit ee408c7942
1 changed files with 5 additions and 13 deletions
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18
arch/x86_64/mm/init.c
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@ -262,19 +262,11 @@ static void __init find_early_table_space(unsigned long end)
tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
/* Put page tables beyond the DMA zones if possible.
RED-PEN might be better to spread them out more over
memory to avoid hotspots */
if (end > MAX_DMA32_PFN<<PAGE_SHIFT)
start = MAX_DMA32_PFN << PAGE_SHIFT;
else if (end > MAX_DMA_PFN << PAGE_SHIFT)
start = MAX_DMA_PFN << PAGE_SHIFT;
else
start = 0x8000;
table_start = find_e820_area(start, end, tables);
if (table_start == -1)
table_start = find_e820_area(0x8000, end, tables);
/* RED-PEN putting page tables only on node 0 could
cause a hotspot and fill up ZONE_DMA. The page tables
need roughly 0.5KB per GB. */
start = 0x8000;
table_start = find_e820_area(start, end, tables);
if (table_start == -1UL)
panic("Cannot find space for the kernel page tables");