]> git.karo-electronics.de Git - linux-beck.git/commitdiff
powerpc: Don't use a 16G page if beyond mem= limits
authorJon Tollefson <kniht@us.ibm.com>
Tue, 21 Oct 2008 15:27:36 +0000 (15:27 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 22 Oct 2008 04:01:21 +0000 (15:01 +1100)
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>
arch/powerpc/mm/hash_utils_64.c

index 5c64af1747525d7b7b5fd0adbae202845564f9e1..8d5b4758c13a5f47508c814ed9e279266bffead3 100644 (file)
@@ -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 */