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powerpc: Don't use a 16G page if beyond mem= limits 

If mem= is used on the boot command line to limit memory then the memory block where a 16G page resides may not be available.

Thanks to Michael Ellerman for finding the problem.

Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Jon Tollefson 2008-10-21 15:27:36 +00:00 committed by Benjamin Herrenschmidt
parent 71773f0337
commit 4792adbac9
1 changed files with 4 additions and 2 deletions
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6
arch/powerpc/mm/hash_utils_64.c
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@ -382,8 +382,10 @@ static int __init htab_dt_scan_hugepage_blocks(unsigned long node,
printk(KERN_INFO "Huge page(16GB) memory: "
"addr = 0x%lX size = 0x%lX pages = %d\n",
phys_addr, block_size, expected_pages);
lmb_reserve(phys_addr, block_size * expected_pages);
add_gpage(phys_addr, block_size, expected_pages);
if (phys_addr + (16 * GB) <= lmb_end_of_DRAM()) {
lmb_reserve(phys_addr, block_size * expected_pages);
add_gpage(phys_addr, block_size, expected_pages);
}
return 0;
}
#endif /* CONFIG_HUGETLB_PAGE */