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

Message ID 48FE8188.8030706@us.ibm.com (mailing list archive)
State Accepted, archived
Commit 4792adbac9eb41cea77a45ab76258ea10d411173
Headers show

Commit Message

Jon Tollefson Oct. 22, 2008, 1:27 a.m. UTC 
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>
---

 arch/powerpc/mm/hash_utils_64.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 5c64af1..8d5b475 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -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 */