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-rw-r--r--arch/x86/mm/pat.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index b629f75f73de..a6cace0694a2 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -783,11 +783,29 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
783 is_ram = pat_pagerange_is_ram(paddr, paddr + size); 783 is_ram = pat_pagerange_is_ram(paddr, paddr + size);
784 784
785 /* 785 /*
786 * reserve_pfn_range() doesn't support RAM pages. Maintain the current 786 * reserve_pfn_range() for RAM pages. We do not refcount to keep
787 * behavior with RAM pages by returning success. 787 * track of number of mappings of RAM pages. We can assert that
788 * the type requested matches the type of first page in the range.
788 */ 789 */
789 if (is_ram != 0) 790 if (is_ram) {
791 if (!pat_enabled)
792 return 0;
793
794 flags = lookup_memtype(paddr);
795 if (want_flags != flags) {
796 printk(KERN_WARNING
797 "%s:%d map pfn RAM range req %s for %Lx-%Lx, got %s\n",
798 current->comm, current->pid,
799 cattr_name(want_flags),
800 (unsigned long long)paddr,
801 (unsigned long long)(paddr + size),
802 cattr_name(flags));
803 *vma_prot = __pgprot((pgprot_val(*vma_prot) &
804 (~_PAGE_CACHE_MASK)) |
805 flags);
806 }
790 return 0; 807 return 0;
808 }
791 809
792 ret = reserve_memtype(paddr, paddr + size, want_flags, &flags); 810 ret = reserve_memtype(paddr, paddr + size, want_flags, &flags);
793 if (ret) 811 if (ret)